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Lorber C, Panda TK, Banerjee I, Sagar S. Catalytic addition reactions of amines, thiols, and diphenyl‐phosphine oxides to heterocumulenes using a bridging Sulfonylimido titanium(IV) complex. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christian Lorber
- CNRS Labo de Chimie de Coordination 205 route de Narbonne 31077 Toulouse FRANCE
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2
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Bhattacharjee J, Sarkar A, Panda TK. Alkali and Alkaline Earth Metal Complexes as Versatile Catalysts for Ring-Opening Polymerization of Cyclic Esters. CHEM REC 2021; 21:1898-1911. [PMID: 34197009 DOI: 10.1002/tcr.202100148] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/10/2021] [Accepted: 06/17/2021] [Indexed: 12/30/2022]
Abstract
Biodegradable polyesters such as poly(ϵ-caprolactone) (PCL) and poly(lactic acid) (PLA) have been considered for use in several areas, such as drug delivery devices, sutures, tissue engineering, and GBR membranes, due to its bio-renewability, biodegradability, and biocompatibility. Several synthetic techniques for the preparation of polyesters have been reported in the literature, amongst which the ring-opening polymerization (ROP) of cyclic esters is the most efficient. A convenient approach to access iso-selective PLAs is polymerization of racemic lactide (rac-LA), which shows excellent stereoregularity without the need for costly chiral auxiliaries or ligands. In this personal account, we review a series of methods that have been practiced to the synthesis of biodegradable polyesters from various cyclic monomers using alkali and alkaline earth metal complexes as efficient catalysts.
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Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi, 502 285, Sangareddy, Telangana, India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd., Survey No. 09, Hosur Road, Electronic City (west), Bangalore, 560100, India
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi, 502 285, Sangareddy, Telangana, India
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3
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Banerjee I, Panda TK. Recent developments in the reduction of unsaturated bonds by magnesium precursors. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6333] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Indrani Banerjee
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy India
| | - Tarun K. Panda
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy India
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4
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Yu X, Wang Z, Han Z. Synthesis and Structural Characterisation of Dinuclear Aluminium Complexes Supported by NNO‐Tridentate Schiff‐Base Ligands and Their Catalysis in the Ring‐Opening Polymerisation of ϵ‐Caprolactone. ChemistrySelect 2021. [DOI: 10.1002/slct.202100635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xiaofeng Yu
- School of Materials and Chemical Engineering University Bengbu 1866 Caoshan Road Anhui 233030 P. R. China
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
- Bengbu Product Quality and Inspection Institute 100 Anmin Road Bengbu Anhui 233030 P. R. China
| | - Zhongxia Wang
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
| | - Zhiyong Han
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
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5
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Bhattacharjee J, Harinath A, Sarkar A, Panda TK. Alkaline Earth Metal-Mediated Highly Iso-selective Ring-Opening Polymerization of rac-Lactide. Chem Asian J 2020; 15:860-866. [PMID: 32022475 DOI: 10.1002/asia.201901751] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 01/20/2020] [Indexed: 11/06/2022]
Abstract
Alkaline earth (Ae) metal complexes of the aminophosphine borane ligand are highly active and iso-selective catalysts for the ring-opening polymerization (ROP) of rac-lactide (LA). The polymerization reactions are well controlled and produce polylactides with molecular weights that are precise and narrowly distributed. Kinetic studies reveal that the ROP of rac-LA catalyzed by all Ae metal complexes had a first-order dependency on LA concentration as well as catalyst concentration. A plausible reaction mechanism for Ae metal complex-mediated ROP of rac-LA is discussed, based on controlled kinetic experiments and molecular chain mobility.
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Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
| | - Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd., Bangalore, 560 100, India
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502285, Sangareddy, Telangana, India
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6
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Banerjee I, Harinath A, Panda TK. Alkali Metal Catalysed Double Hydrophosphorylation of Nitriles and Alkynes. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900164] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Indrani Banerjee
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
| | - Tarun K. Panda
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
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7
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Harinath A, Bhattacharjee J, Sarkar A, Panda TK. Alkali metal complex-mediated ring-opening polymerization of rac-LA, ε-caprolactone, and δ-valerolactone. NEW J CHEM 2019. [DOI: 10.1039/c9nj01130g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Catalytic ring opening polymerization (ROP) of rac-lactide, ε-caprolactone, and δ-valerolactone using alkali metal (Li, Na, K) complexes as competent catalysts are reported.
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Affiliation(s)
- Adimulam Harinath
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
| | - Jayeeta Bhattacharjee
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd
- Bangalore – 560 100
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
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8
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Harinath A, Bhattacharjee J, Nayek HP, Panda TK. Alkali metal complexes as efficient catalysts for hydroboration and cyanosilylation of carbonyl compounds. Dalton Trans 2018; 47:12613-12622. [PMID: 30043795 DOI: 10.1039/c8dt02032a] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We report here reactions between the N-adamantyliminopyrolyl ligand 2-(AdN[double bond, length as m-dash]CH)-C4H3NH (L-H) and alkali metal hexamethyldisilazides [MN(SiMe3)2] (M = Li, Na and K) to afford the dimeric [{2-(AdN[double bond, length as m-dash]CH)-C4H3NLi(THF)}2] (1), [{2-(AdN[double bond, length as m-dash]CH)-C4H3N}{Na(THF)1.5}2] (2) and polymeric [{2-(AdN[double bond, length as m-dash]CH)-C4H3NK(THF)}n] (3) complexes at ambient temperature. A one-pot reaction between L-H, [KN(SiMe3)2] and alkaline earth metal diiodide (AeI2) in a 2 : 2 : 1 molar ratio, which resulted in the formation of a heteroleptic Ae metal complex [κ2-{2-(AdN[double bond, length as m-dash]CH)-C4H3N}2Ae(THF)2] [Ae = Mg (4), Ca (5)], is also reported. The solid-state structures of complexes 1, 3 and 4 were established through single-crystal X-ray diffraction analysis. The alkali and alkaline earth metal complexes 1-5 were utilised as precatalysts for the catalytic hydroboration of pinacolborane (HBpin) with aldehydes and ketones, and potassium complex 3 was identified as a competent catalyst under mild conditions. Additionally, cyanosilylation of carbonyl compounds was explored with trimethylsilyl cyanide and aldehydes/ketones, using the alkali metal precatalyst 3 under mild conditions. In both catalytic processes, the potassium catalyst 3 exhibited high tolerance towards a number of functional groups.
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Affiliation(s)
- Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi - 502 285, Sangareddy, Telangana, India.
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9
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Harinath A, Bhattacharjee J, Sarkar A, Nayek HP, Panda TK. Ring Opening Polymerization and Copolymerization of Cyclic Esters Catalyzed by Group 2 Metal Complexes Supported by Functionalized P–N Ligands. Inorg Chem 2018; 57:2503-2516. [DOI: 10.1021/acs.inorgchem.7b02847] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
| | - Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
| | - Alok Sarkar
- Momentive Performance
Materials Pvt. Ltd., Bangalore 560 100, India
| | - Hari Pada Nayek
- Department of Applied Chemistry, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
| | - Tarun K. Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
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Xu X, Hu F, Ma Y, Gao J, Shuai Q. Facile microwave synthesis, structural diversity and herbicidal activity of six novel alkaline-earth metal complexes (AECs) based on skeletal isomerization chlorophenoxyacetic acids. NEW J CHEM 2018. [DOI: 10.1039/c8nj00107c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Facile microwave synthesis, structural diversity and herbicidal activity of six novel alkaline-earth metal complexes (AECs) based on skeletal isomerization chlorophenoxyacetic acids.
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Affiliation(s)
- Xiuling Xu
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling
- People's Republic of China
| | - Fan Hu
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling
- People's Republic of China
| | - Yuwei Ma
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling
- People's Republic of China
| | - Jinming Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling
- People's Republic of China
| | - Qi Shuai
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Chemistry & Pharmacy
- Northwest A&F University
- Yangling
- People's Republic of China
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11
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Harinath A, Bano K, Ahmed S, Panda TK. 2-Picolylamino(diphenylphosphinoselenoic)amide supported zinc complexes: Efficient catalyst for insertion of N–H bond into carbodiimides, isocyanates, and isothiocyanate. PHOSPHORUS SULFUR 2017. [DOI: 10.1080/10426507.2017.1370590] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India
| | - Kulsum Bano
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India
| | - Shakil Ahmed
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India
| | - Tarun K. Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India
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12
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Bhattacharjee J, Harinath A, Nayek HP, Sarkar A, Panda TK. Highly Active and Iso-Selective Catalysts for the Ring-Opening Polymerization of Cyclic Esters using Group 2 Metal Initiators. Chemistry 2017; 23:9319-9331. [DOI: 10.1002/chem.201700672] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian Institute of Technology (ISM), Dhanbad; 826004 Jharkhand India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd. Survey No. 09; Hosur Road Electronic City (West) Bangalore 560100 India
| | - Tarun K. Panda
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi 502 285, Sangareddy, Telangana India
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13
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Bhattacharjee J, Das S, Kottalanka RK, Panda TK. Hydroamination of carbodiimides, isocyanates, and isothiocyanates by a bis(phosphinoselenoic amide) supported titanium(iv) complex. Dalton Trans 2016; 45:17824-17832. [PMID: 27774537 DOI: 10.1039/c6dt03063g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The hydroamination of heterocumulenes such as carbodiimides, isocyanates, and isothiocyanates by a bis(phosphinoselenoic amide) supported titanium(iv) complex as a precatalyst is reported here. The titanium(iv) complex [{Ph2P(Se)NCH2CH2NPPh2(Se)}Ti(NMe2)2] (1) was synthesised by the reaction of tetrakis-(dimethylamido)titanium(iv) [Ti(NMe2)4] with [{Ph2P(Se)NHCH2CH2NHPPh2(Se)}] in toluene at ambient temperature. Titanium complex 1 proved to be a competent pre-catalyst for the addition of an amine N-H bond to carbodiimides, isocyanates, and isothiocyanates. The reaction scope was expanded to reactions of aliphatic and aromatic amines with phenylisocyanates and phenylisothiocyanates in toluene solvents proceeding rapidly at room temperature with 5 mol% catalyst loadings to yield the corresponding urea and thio-urea derivatives up to 99%. However, ambient temperature was needed for hydroamination of 1,3-dicyclohexylcarbodiimide. The amine addition reactions with isocyanates showed first order kinetics with respect to catalyst 1 as well as substrates. The most plausible mechanism for the hydroamination reaction was established by isolating 1,1-dimethylphenyl urea as a side product.
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Affiliation(s)
- Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
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14
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Anga S, Carpentier JF, Panda TK, Roisnel T, Sarazin Y. Calcium complexes with imino-phosphinanilido chalcogenide ligands for heterofunctionalisation catalysis. RSC Adv 2016. [DOI: 10.1039/c6ra13117d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Syntheses, characterisation and utilisation of the calcium complexes supported by imino-phosphinanilido chalcogenide ligands {Ph2P(E)–N–C6H4–CHN(Dipp)} (E = S, Se) as molecular precatalysts for the heterofunctionalisation of styrene are reported.
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Affiliation(s)
- Srinivas Anga
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | - Jean-François Carpentier
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
| | - Yann Sarazin
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
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Kottalanka RK, Harinath A, Rej S, Panda TK. Group 1 and group 2 metal complexes supported by a bidentate bulky iminopyrrolyl ligand: synthesis, structural diversity, and ε-caprolactone polymerization study. Dalton Trans 2015; 44:19865-79. [PMID: 26511076 DOI: 10.1039/c5dt03222a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report here a series of alkali and alkaline earth metal complexes, each with a bulky iminopyrrolyl ligand [2-(Ph3CN=CH)C4H3NH] (1-H) moiety in their coordination sphere, synthesized using either alkane elimination or silylamine elimination methods or the salt metathesis route. The lithium salt of molecular composition [Li(2-(Ph3CN=CH)C4H3N)(THF)2] (2) was prepared using the alkane elimination method, and the silylamine elimination method was used to synthesize the dimeric sodium and tetra-nuclear potassium salts of composition [(2-(Ph3CN=CH)C4H3N)Na(THF)]2 (3) and [(2-(Ph3CN=CH)C4H3N)K(THF)0.5]4 (4) respectively. The magnesium complex of composition [(THF)2Mg(CH2Ph){2-(Ph3CN=CH)C4H3N}] (5) was synthesized through the alkane elimination method, in which [Mg(CH2Ph)2(OEt2)2] was treated with the bulky iminopyrrole ligand 1-H in 1 : 1 molar ratio, whereas the bis(iminopyrrolyl)magnesium complex [(THF)2Mg{2-(Ph3CN=CH)C4H3N}2] (6) was isolated using the salt metathesis route. The heavier alkaline earth metal complexes of the general formula {(THF)nM(2-(Ph3CN=CH)C4H3N)2} [M = Ca (7), Sr (8), and n = 2; M = Ba (9), n = 3] were prepared in pure form using two synthetic methods: in the first method, the bulky iminopyrrole ligand 1-H was directly treated with the alkaline earth metal precursor [M{N(SiMe3)2}2(THF)n] (where M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent at ambient temperature. The complexes 7-9 were also obtained using the salt metathesis reaction, which involves the treatment of the potassium salt (4) with the corresponding metal diiodides MI2 (M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent. The molecular structures of all the metal complexes (1-H, 2-9) in the solid state were established through single-crystal X-ray diffraction analysis. The complexes 5-9 were tested as catalysts for the ring-opening polymerization of ε-caprolactone. High activity was observed in the heavier alkaline earth metal complexes 7-9, with a very narrow polydispersity index in comparison to that of magnesium complexes 5 and 6.
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Affiliation(s)
- Ravi K Kottalanka
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - A Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Supriya Rej
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
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16
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Bhattacharjee J, Das S, Reddy TDN, Nayek HP, Mallik BS, Panda TK. Alkali Metal and Alkaline Earth Metal Complexes with the Bis(borane-diphenylphosphanyl)amido Ligand - Synthesis, Structures, and Catalysis for Ring-Opening Polymerization of ϵ-Caprolactone. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500593] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Syntheses and structures of dimeric sodium and potassium complexes of 2,6-diisopropyl-anilidophosphine borane ligand. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0782-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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18
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Anga S, Bhattacharjee J, Harinath A, Panda TK. Synthesis, structure and reactivity study of magnesium amidinato complexes derived from carbodiimides and N,N'-bis(2,6-diisopropylphenyl)-1,4-diaza-butadiene ligands. Dalton Trans 2015; 44:955-65. [PMID: 25407563 DOI: 10.1039/c4dt03074e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We report an amidinato ligand-supported series of magnesium complexes obtained from the insertion of a magnesium-carbon bond into a carbon-nitrogen double bond of different carbodiimides and α-diimine ligands. The magnesium complexes [Mg(CH2Ph){CyN[double bond, length as m-dash]C(CH2Ph)NCy}]2 (), [Mg(CH2Ph){(i)PrN[double bond, length as m-dash]C(CH2Ph)N(i)Pr}]2 () and the homoleptic [Mg{(t)BuN[double bond, length as m-dash]C(CH2Ph)N(t)Bu}2] () (Cy = cyclohexyl, (i)Pr = isopropyl, (t)Bu = tert-butyl) were prepared by the reaction of dibenzyl magnesium [Mg(CH2Ph)2(Et2O)2] with the respective carbodiimides either in 1 : 1 or 1 : 2 molar ratio in toluene. The analogous reaction of [Mg(CH2Ph)2(Et2O)2] with the N,N'-bis(2,6-diisopropylphenyl)-1,4-diaza-1,3-butadiene (Dipp2DAD) ligand afforded the corresponding homoleptic magnesium complex [Mg{DippN[double bond, length as m-dash]C(CH2Ph)CH2NDipp}2] () (Dipp = 2,6 diisopropylphenyl) in good yield. The solid-state structures of magnesium complexes were confirmed by single-crystal X-ray diffraction analysis. It was observed that in each case, a magnesium-carbon bond was inserted into the carbon-nitrogen double bond of either carbodiimides or Dipp2DAD resulting in a monoanionic amido-imino ligand. In a further reaction between and N-aryliminopyrrolyl ligand 2-(2,6-(i)Pr2C6H3N[double bond, length as m-dash]CH)C4H3NH (ImpDipp-H) in 1 : 2 molar ratio, a new magnesium complex [Mg(ImpDipp)2{CyN[double bond, length as m-dash]C(CH2Ph)NHCy}] (), with one amidinato and two aryliminopyrrolyl ligands in the coordination sphere, was obtained in good yield. In contrast, the homoleptic magnesium complex reacted with one equivalent of N-aryliminopyrrolyl ligand (ImpDipp-H) to produce another mixed ligated magnesium complex [Mg{DippN[double bond, length as m-dash]C(CH2Ph)CH2NDipp}(ImpDipp)] (), with a benzylated DAD ligand and aryliminopyrrolyl ligands in the coordination sphere. Further reaction of complex with benzyl alcohol (PhCH2OH) afforded the third mixed ligated magnesium complex [Mg{DippN[double bond, length as m-dash]C(CH2Ph)CH2NDipp}(OCH2Ph)2] () in very good yield. The magnesium complexes were characterised using standard analytical/spectroscopic techniques and their solid-state structures were established by single-crystal X-ray diffraction analysis.
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Affiliation(s)
- Srinivas Anga
- Department of Chemistry, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram 502205, Telangana, India.
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19
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Naktode K, Bhattacharjee J, Nayek HP, Panda TK. Imidazol-2-ylidene-N′-phenylureate ligands in alkali and alkaline earth metal coordination spheres – heterocubane core to polymeric structural motif formation. Dalton Trans 2015; 44:7458-69. [DOI: 10.1039/c5dt00490j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthetic and structural details of imidazol-2-ylidene-N′-phenylureate ligand supported two potassium complexes with a hetero-cubane K4O4 core and a polymeric structure, along with a mixed metal Ca–K complex are presented.
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Affiliation(s)
- Kishor Naktode
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
| | - Jayeeta Bhattacharjee
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
| | - Hari Pada Nayek
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
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20
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Kottalanka RK, Harinath A, Panda TK. Chiral alkaline earth metal complexes with M–Se direct bond (M = Mg, Ca, Sr, Ba): syntheses, structures and ε-caprolactone polymerisation. RSC Adv 2015. [DOI: 10.1039/c5ra04495b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Synthesis and structural details of enantiomerically pure alkaline earth metal complexes (Mg, Ca, Sr, Ba) supported by chiral phosphinoselenoic amides are reported.
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Affiliation(s)
- Ravi K. Kottalanka
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
| | - Adimulam Harinath
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram 502205
- India
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21
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Naktode K, Reddy TDN, Nayek HP, Mallik BS, Panda TK. Heavier group 2 metal complexes with a flexible scorpionate ligand based on 2-mercaptopyridine. RSC Adv 2015. [DOI: 10.1039/c5ra04696c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Synthetic and structural details of flexible scorpionate ligand based on 2-mercaptopyridine (Bmp) supported heavier alkaline earth metal complexes with metal–sulfur bonds (metal = Sr, Ba) have been presented.
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Affiliation(s)
- Kishor Naktode
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
| | | | - Hari Pada Nayek
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad
- India
| | - Bhabani S. Mallik
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- India
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22
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Colwell JM, Wentrup-Byrne E, George GA, Schué F. A pragmatic calcium-based initiator for the synthesis of polycaprolactone copolymers. POLYM INT 2014. [DOI: 10.1002/pi.4823] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- John M Colwell
- School of Chemistry, Physics and Mechanical Engineering; Queensland University of Technology; GPO Box 2434 Brisbane Queensland 4001 Australia
| | - Edeline Wentrup-Byrne
- School of Chemistry, Physics and Mechanical Engineering; Queensland University of Technology; GPO Box 2434 Brisbane Queensland 4001 Australia
| | - Graeme A George
- School of Chemistry, Physics and Mechanical Engineering; Queensland University of Technology; GPO Box 2434 Brisbane Queensland 4001 Australia
| | - François Schué
- Laboratoire de Chimie Macromoleculaire; Université Montpellier II; Place Eugène Bataillon 34095 Montpellier Cedex 5 France (Deceased 31 January 2014)
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