1
|
Dey N, Kulhánek J, Bureš F, Bhattacharya S. Imidazole-Functionalized Y-Shaped Push-Pull Dye for Nerve Agent Sensing as well as a Catalyst for Their Detoxification. J Org Chem 2021; 86:14663-14671. [PMID: 34648709 DOI: 10.1021/acs.joc.1c01488] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A Y-shaped push-pull dye (1) with N,N-dimethylanilino donors and a benzonitrile acceptor connected via an imidazole-based π-conjugated spacer was designed. It showed a dark yellow color in solution due to facile intramolecular charge-transfer interaction, but no fluorescence was detected, presumably due to the photo-induced electron transfer effect of the imidazole moiety. However, addition of nerve agents such as diethyl chlorophosphate (DCP, sarin mimic) and diethyl cyanophosphate (DCNP, Tabun mimic) resulted in a blue-colored fluorescence with fading of the native dark yellow color. Mechanistic studies indicated nucleophilic attack of imidazole at the phosphorus of DCP or DCNP, leading to the formation of a phosphorylated intermediate, which undergoes time-dependent hydrolysis (∼24 h) in aqueous medium. This process recovers the free probe (enzyme-like behavior) and releases a less-toxic organophosphate compound as the byproduct. The phosphorylated derivative of 1, formed during such interaction, shows a different electronic behavior, which reduces the extent of charge-transfer interaction as well as nonradiative decay and supports emissive properties. Considering the high sensitivity of 1 towards DCP and DCNP with LOD 35 and 42 ppb, we prepared easy test strips for on-site vapor-phase detection of nerve agents.
Collapse
Affiliation(s)
- Nilanjan Dey
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Telangana 500078, India
| | - Jiří Kulhánek
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 53210, Czech Republic
| | - Filip Bureš
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, CZ 53210, Czech Republic
| | - Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.,School of Applied and Interdisciplinary Sciences, Indian Association for Cultivation of Science, Kolkata 700032, India
| |
Collapse
|
2
|
Nasrollahzadeh M, Nezafat Z, Bidgoli NSS, Shafiei N. Use of tetrazoles in catalysis and energetic applications: Recent developments. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111788] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
3
|
Malik G, Swyka RA, Tiwari VK, Fei X, Applegate GA, Berkowitz DB. A thiocyanopalladation/carbocyclization transformation identified through enzymatic screening: stereocontrolled tandem C-SCN and C-C bond formation. Chem Sci 2017; 8:8050-8060. [PMID: 29568453 PMCID: PMC5855125 DOI: 10.1039/c7sc04083k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 09/29/2017] [Indexed: 12/31/2022] Open
Abstract
Herein we describe a formal thiocyanopalladation/carbocyclization transformation and its parametrization and optimization using a new elevated temperature plate-based version of our visual colorimetric enzymatic screening method for reaction discovery. The carbocyclization step leads to C-SCN bond formation in tandem with C-C bond construction and is highly stereoselective, showing nearly absolute 1,2-anti-stereoinduction (5 examples) for substrates bearing allylic substitution, and nearly absolute 1,3-syn-stereoinduction (16 examples) for substrates bearing propargylic substitution. Based upon these high levels of stereoinduction, the dependence of the 1,2-stereoinduction upon cyclization substrate geometry, and the generally high preference for the transoid vinyl thiocyanate alkene geometry, a mechanistic model is proposed, involving (i) Pd(ii)-enyne coordination, (ii) thiocyanopalladation, (iii) migratory insertion and (iv) β-elimination. Examples of transition metal-mediated C-SCN bond formation that proceed smoothly on unactivated substrates and allow for preservation of the SCN moiety are lacking. Yet, the thiocyanate functionality is of great value for biophysical chemistry (vibrational Stark effect) and medicinal chemistry (S,N-heterocycle construction). The title transformation accommodates C-, O-, N- and S-bridged substrates (6 examples), thereby providing the corresponding carbocyclic or heterocyclic scaffolds. The reaction is also shown to be compatible with a significant range of substituents, varying in steric and electronic demand, including a wide range of substituted aromatics, fused bicyclic and heterocyclic systems, and even biaryl systems. Combination of this new transformation with asymmetric allylation and Grubbs ring-closing metathesis provides for a streamlined enantio- and diastereoselective entry into the oxabicyclo[3.2.1]octyl core of the natural products massarilactone and annuionone A, as also evidenced by low temperature X-ray crystal structure determination. Utilizing this bicyclic scaffold, we demonstrate the versatility of the thiocyanate moiety for structural diversification post-cyclization. Thus, the bridging vinyl thiocyanate moiety is smoothly elaborated into a range of derivative functionalities utilizing transformations that cleave the S-CN bond, add the elements of RS-CN across a π-system and exploit the SCN moiety as a cycloaddition partner (7 diverse examples). Among the new functionalities thereby generated are thiotetrazole and sulfonyl tetrazole heterocycles that serve as carboxylate and phosphate surrogates, respectively, highlighting the potential of this approach for future applications in medicinal chemistry or chemical biology.
Collapse
Affiliation(s)
- G Malik
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - R A Swyka
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - V K Tiwari
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - X Fei
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - G A Applegate
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - D B Berkowitz
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| |
Collapse
|
4
|
Kinetic Investigation of Micellar Promoted Pyridine based Oximate and Hydroxamate Catalysis on Phosphotriester Pesticides. Catal Letters 2016. [DOI: 10.1007/s10562-016-1912-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
5
|
Dey N, Bhattacharya S. A Glimpse of Our Journey into the Design of Optical Probes in Self-assembled Surfactant Aggregates. CHEM REC 2016; 16:1934-49. [DOI: 10.1002/tcr.201600012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Indexed: 02/05/2023]
Affiliation(s)
- Nilanjan Dey
- Department of Organic Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Santanu Bhattacharya
- Department of Organic Chemistry; Indian Institute of Science; Bangalore 560012 India
- Indian Association for the Cultivation of Science; 2A and 2B Raja S. C. Mullick Road Jadavpur Kolkata 700032 India
| |
Collapse
|
6
|
Singh N, Karpichev Y, Tiwari AK, Kuca K, Ghosh KK. Oxime functionality in surfactant self-assembly: An overview on combating toxicity of organophosphates. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.04.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
7
|
SATNAMI MANMOHANL, KARBHAL INDRAPAL, DEWANGAN HITESHK. O-Nucleophilicity of Hydroxamate Ions for Cleavage of Carboxylate and Phosphate Esters in Cationic Micelles. INT J CHEM KINET 2014. [DOI: 10.1002/kin.20852] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- MANMOHAN L. SATNAMI
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur 492 010 India
| | - INDRAPAL KARBHAL
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur 492 010 India
| | - HITESH K. DEWANGAN
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur 492 010 India
| |
Collapse
|
8
|
Fortes MP, Bassaco MM, Kaufman TS, Silveira CC. A convenient eco-friendly system for the synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles employing CeCl3·7H2O in PEG-400. RSC Adv 2014. [DOI: 10.1039/c4ra05625f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The use of CeCl3·7H2O in PEG-400 for the convenient synthesis of 5-sulfenyl tetrazoles derived from indoles and pyrroles, is reported. The scope and limitations of the transformation were also studied.
Collapse
Affiliation(s)
- Margiani P. Fortes
- Departamento de Química
- Universidade Federal de Santa Maria 97105-900
- Santa Maria, Brazil
| | - Mariana M. Bassaco
- Departamento de Química
- Universidade Federal de Santa Maria 97105-900
- Santa Maria, Brazil
| | | | - Claudio C. Silveira
- Departamento de Química
- Universidade Federal de Santa Maria 97105-900
- Santa Maria, Brazil
| |
Collapse
|
9
|
Khan MAS, Bandyopadhyay T, Ganguly B. Probing the simulant behavior of PNPDPP toward parathion and paraoxon: A computational study. J Mol Graph Model 2012; 34:10-7. [DOI: 10.1016/j.jmgm.2011.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 12/22/2011] [Accepted: 12/26/2011] [Indexed: 10/14/2022]
|
10
|
Bhattacharya S, Biswas J. Vesicle and stable monolayer formation from simple "click" chemistry adducts in water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1581-1591. [PMID: 21291251 DOI: 10.1021/la104851g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Click chemistry has been successfully extended into the field of molecular design of novel amphiphatic adducts. After their syntheses and characterizations, we have studied their aggregation properties in aqueous medium. Each of these adducts forms stable suspensions in water. These suspensions have been characterized by dynamic light scattering (DLS) studies and transmission electron microscopy (TEM). The presence of inner aqueous compartments in such aggregates has been demonstrated using dye (methylene blue) entrapment studies. These aggregates have been further characterized using X-ray diffraction (XRD), which indicates the existence of bilayer structures in them. Therefore, the resulting aggregates could be described as vesicles. The temperature-induced order-to-disorder transitions of the vesicular aggregates and the accompanying changes in their packing and hydration have been examined using high-sensitivity differential scanning calorimetry, fluorescence anisotropy, and generalized polarization measurements using appropriate membrane-soluble probe, 1,6-diphenylhexatriene, and Paldan, respectively. The findings of these studies are consistent with each other in terms of the apparent phase transition temperatures. Langmuir monolayer studies confirmed that these click adducts also form stable monolayers on buffered aqueous subphase at the air-water interface.
Collapse
Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India.
| | | |
Collapse
|
11
|
Andrada DM, Jimenez-Halla JOC, Solà M. Mechanism of the aminolysis of Fischer alkoxy and thiocarbene complexes: a DFT study. J Org Chem 2010; 75:5821-36. [PMID: 20704176 DOI: 10.1021/jo100738x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
B3LYP calculations have been carried out to study the reaction mechanism of the aminolysis of Fischer carbene complexes of the type (CO)(5)Cr=C(XMe)R (X = O and S; R = Me and Ph). We have explored different possible reaction mechanisms either through neutral or zwitterionic intermediates as well as a general base catalysis assisted by an ammonia molecule. Our results show that the most favorable pathway for the aminolysis of Fischer carbene complexes is through a stepwise reaction via a zwitterionic intermediate generated by the initial nucleophilic attack. We have found that the ammonia-catalyzed mechanism entails a significantly lower barrier for the rate-determining step than the uncatalyzed one. At lower pressure gas-phase conditions, the rate-determining step corresponds to the concerted proton transfer and MeXH elimination. Thiocarbene complexes show a higher energy barrier for this rate-determining step due to the lower basicity of the MeS(-) substituent. At higher pressure or in solution, the rate-determining step corresponds to the initial nucleophilic attack. Our results indicate that the transition state of the nucleophilic attack is more advanced and has a higher barrier for alkoxycarbene than thiocarbene complexes due to the stronger pi-donor character of the alkoxy group that reduces the electrophilicity of the attacked carbene atom making the nucleophilic attack more difficult.
Collapse
Affiliation(s)
- Diego M Andrada
- Instituto de Investigaciones en Fisicoquímica de Córdoba, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5016 Córdoba, Argentina
| | | | | |
Collapse
|
12
|
Satnami ML, Dhritlahre S, Nagwanshi R, Karbhal I, Ghosh KK, Nome F. Nucleophilic Attack of Salicylhydroxamate Ion at C═O and P═O Centers in Cationic Micellar Media. J Phys Chem B 2010; 114:16759-65. [DOI: 10.1021/jp1066549] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manmohan Lal Satnami
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| | - Sunita Dhritlahre
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| | - Rekha Nagwanshi
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| | - Indrapal Karbhal
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| | - Kallol K. Ghosh
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| | - Faruk Nome
- School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur (Chhatisgarh), India 492010, Department of Chemistry, Government College Barnagar (M.P.), India, 456010, and Departamento de Quimica, Universidade Federal de Santa Catarina, 88040-900 Floriano’polis, Santa Catarina, Brazil
| |
Collapse
|
13
|
Ashkenazi N, Segall Y, Chen R, Sod-Moriah G, Fattal E. The Mechanism of Nucleophilic Displacements at Phosphorus in Chloro-Substituted Methylphosphonate Esters: P−O vs P−C Bond Cleavage: A DFT Study. J Org Chem 2010; 75:1917-26. [DOI: 10.1021/jo9026325] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
14
|
Tiwari S, Ghosh KK, Marek J, Kuca K. Functionalized surfactant mediated reactions of carboxylate, phosphate and sulphonate esters. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1635] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
15
|
Kang SG, Kim HJ, Kim NH, Jeong JH. Synthesis and Characterization of TetraazaMacrocyclic Nickel(II) and Copper(II) Complexes Bearing Two Tetrazole Pendant Arms. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.12.3101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
16
|
Tiwari S, Ghosh KK, Marek J, Kuca K. Comparative study of nucleophilic efficacy of pralidoxime towards phosphorus, sulfur and thiophosphorus based esters. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11144-009-0072-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
17
|
Bhattacharya S, Kumari N. Metallomicelles as potent catalysts for the ester hydrolysis reactions in water. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2009.01.016] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
18
|
Zhang H, Chen D, Zhang G, Mi S, Lu N. Mechanism of the aminolysis of dimethyl phenylphosphinate: A DFT study. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.theochem.2009.04.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
19
|
Souza BS, Brandão TAS, Orth ES, Roma AC, Longo RL, Bunton CA, Nome F. Hydrolysis of 8-Quinolyl Phosphate Monoester: Kinetic and Theoretical Studies of the Effect of Lanthanide Ions. J Org Chem 2008; 74:1042-53. [DOI: 10.1021/jo801870v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bruno S. Souza
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Tiago A. S. Brandão
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Elisa S. Orth
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Ana C. Roma
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Ricardo L. Longo
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Clifford A. Bunton
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| | - Faruk Nome
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil, Departamento de Química Fundamental, Universidade Federal de Recife, Pernambuco, 50740-540, Brazil, and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510
| |
Collapse
|
20
|
Sá MM, Fernandes L, Ferreira M, Bortoluzzi AJ. Synthesis of allylic thiocyanates and novel 1,3-thiazin-4-ones from 2-(bromomethyl)alkenoates and S-nucleophiles in aqueous medium. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.12.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
21
|
Ghosh KK, Bal S, Kolay S, Shrivastava A. Comparative nucleophilic reactivities in carboxylate, phosphinate, and thiophosphate esters cleavage. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1370] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
22
|
Ghosh KK, Kolay S, Bal S, Satnami ML, Quagliotto P, Dafonte PR. Effect of cationic gemini surfactants on the hydrolysis of carboxylate and phosphate esters using hydroxamate ions. Colloid Polym Sci 2007. [DOI: 10.1007/s00396-007-1769-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
23
|
Um IH, Akhtar K, Shin YH, Han JY. Aminolyses of Aryl Diphenylphosphinates and Diphenylphosphinothioates: Effect of Modification of Electrophilic Center from PO to PS. J Org Chem 2007; 72:3823-9. [PMID: 17425371 DOI: 10.1021/jo070171n] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A kinetic study is reported for aminolysis of aryl diphenylphosphinothioates (2a-i). The phosphinothioates 2a-i are less reactive than aryl diphenylphosphinates (1a-i), the oxygen analogues of 2a-i, regardless of the basicity of the leaving aryloxides or the attacking amines. The Yukawa-Tsuno plot for the reactions of 2b-i with piperidine exhibits good linearity with a small r value (r=0.28), indicating that the leaving group departs at the rate-determining step with a small degree of bond fission. Reactions of 2,4-dinitrophenyl diphenylphosphinothioate (2a) with alicyclic secondary amines result in a good linear Brønsted-type plot with betanuc=0.52, implying that the reactions proceed through a concerted mechanism. The betanuc value determined for the reactions of 2a is slightly larger than that reported for the corresponding reactions of 2,4-dinitrophenyl diphenylphosphinate (1a, i.e., betanuc=0.38), suggesting that reactions of 2a proceed through a tighter transition state (TS) than that of 1a. The reaction of 2a with piperidine exhibits a ca. 0.4 kcal/mol more favorable enthalpy of activation (DeltaH) than that of 1a. On the contrary, the entropy of activation at 25.0 degrees C (TDeltaS) is ca. 1.5 kcal/mol more unfavorable for the reaction of 2a than for that of 1a. This result supports the proposal that the reaction of 2a proceeds through a tighter TS than that of 1a and explains why 2a-i are less reactive than 1a-i.
Collapse
Affiliation(s)
- Ik-Hwan Um
- Division of Nano Sciences and Department of Chemistry, Ewha Womans University, Seoul 120-750, Korea.
| | | | | | | |
Collapse
|
24
|
Um IH, Park JE, Shin YH. Combined dual substituent constant and activation parameter analysis assigns a concerted mechanism to alkaline ethanolysis at phosphorus of Y-substituted phenyl diphenylphosphinates. Org Biomol Chem 2007; 5:3539-43. [DOI: 10.1039/b712427a] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
25
|
Trifonov RE, Ostrovskii VA. Protolytic equilibria in tetrazoles. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2006. [DOI: 10.1134/s1070428006110017] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
26
|
Um IH, Shin YH, Han JY, Mishima M. Aminolysis of Y-Substituted Phenyl Diphenylphosphinates and Benzoates: Effect of Modification of Electrophilic Center from CO to PO. J Org Chem 2006; 71:7715-20. [PMID: 16995678 DOI: 10.1021/jo061308x] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of modification of the electrophilic center from C=O to P=O on reactivity and reaction mechanism has been investigated for aminolysis of Y-substituted phenyl diphenylphosphinates (1a-j) and benzoates (2a-i). The phosphinates 1a-j are less reactive than the benzoates 2a-i. The reactions of 2,4-dinitrophenyl diphenylphosphinate (1a) with alicyclic secondary amines resulted in a linear Brønsted-type plot with a beta(nuc) value of 0.38, while the corresponding reactions of 2,4-dinitrophenyl benzoate (2a) yielded a curved Brønsted-type plot. Similarly, a linear Brønsted-type plot with a beta(lg) value of -0.66 was obtained for the reactions of 1a-j with piperidine, while the corresponding reactions of 2a-i gave a curved Brønsted-type plot. The linear Brønsted-type plots for the reactions of 1a-j have been taken as evidence for a concerted mechanism, while the curved Brønsted-type plots for the reactions of 2a-i have been suggested to indicate a change in the rate-determining step of a stepwise mechanism. The Hammett plot for the reactions of 1b-j exhibited a poor correlation with sigma(-) constants (R(2) = 0.962) but slightly better correlation with sigma(o) (R(2) = 0.986). However, the Yukawa-Tsuno plot for the same reactions resulted in an excellent correlation (R(2) = 0.9993) with an r value of 0.30. The aminolysis of 1a-j has been suggested to proceed through a concerted mechanism with an early transition state on the basis of the small beta(nuc) and small r values.
Collapse
Affiliation(s)
- Ik-Hwan Um
- Department of Chemistry, Ewha Womans University, Seoul 120-750, Korea.
| | | | | | | |
Collapse
|
27
|
Ghosh KK, Sinha D, Satnami ML, Dubey DK, Shrivastava A, Palepu RM, Dafonte PR. Enhanced nucleophilic reactivity of hydroxamate ions in some novel micellar systems for the cleavage of Parathion. J Colloid Interface Sci 2006; 301:564-8. [PMID: 16797580 DOI: 10.1016/j.jcis.2006.05.061] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2006] [Revised: 05/19/2006] [Accepted: 05/23/2006] [Indexed: 11/28/2022]
Abstract
The reactivity of three alpha-nucleophiles, i.e. N-phenylbenzohydroxamate, benzohydroxamate and salicylhydroxamate ions towards cleavage of p-nitrophenyldiethyl phosphorothioate (Parathion) is considerably enhanced in the presence of cationic surfactant, i.e. cetyltrimethylammonium bromide. The esterolytic properties of N-phenylbenzohydroxamate ion for parathion have also been examined in two novel surfactants, viz. cetyltriphenylphosphonium bromide and cetyldimethyl ethanol ammonium bromide. The cetyldimethyl ethanol ammonium bromide is more reactive. The rate-surfactant profiles have been fitted with pseudophase model.
Collapse
Affiliation(s)
- Kallol K Ghosh
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492010, India.
| | | | | | | | | | | | | |
Collapse
|