1
|
Böhme T, Egeland M, Lorentzen M, Mady MF, Solbakk MF, Sæbø KS, Jørgensen KB. Regiospecific Photochemical Synthesis of Methylchrysenes. MOLECULES (BASEL, SWITZERLAND) 2022; 28:molecules28010237. [PMID: 36615430 PMCID: PMC9822284 DOI: 10.3390/molecules28010237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/15/2022] [Accepted: 12/22/2022] [Indexed: 12/29/2022]
Abstract
Methylated polycyclic aromatic hydrocarbons (PAHs) are suspected to be some of the toxic compounds in crude oil towards marine life and are needed as single compounds for environmental studies. 1-, 3- and 6-methylchrysene (3a,b,c) were prepared as single isomers by photochemical cyclization of the corresponding stilbenoids in the Mallory reaction using stoichiometric amounts of iodine in 82-88% yield. 2-methylchrysene (3d) was prepared by photochemical cyclization where the regioselectivity was controlled by elimination of an ortho-methoxy group under acidic oxygen free conditions in 72% yield. These conditions failed to form 4-methylchrysene from the corresponding stilbenoid. All stilbenoids were made from a common naphthyl Wittig salt and suitably substituted benzaldehydes. We have also demonstrated that methylchrysenes can be oxidized to the corresponding chrysenecarboxylic acids by KMnO4 in modest yields.
Collapse
Affiliation(s)
- Thomas Böhme
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
| | - Mari Egeland
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
| | - Marianne Lorentzen
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
| | - Mohamed F. Mady
- Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
| | - Michelle F. Solbakk
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
| | - Krister S. Sæbø
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
| | - Kåre B. Jørgensen
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, P.O. Box 8600, N-4036 Stavanger, Norway
- Correspondence: ; Tel.: +47-51-83-23-06
| |
Collapse
|
2
|
Gao H, Chen JY, Peng Z, Feng L, Tung CH, Wang W. Bioinspired Iron-Catalyzed Dehydration of Aldoximes to Nitriles: A General N-O Redox-Cleavage Method. J Org Chem 2022; 87:10848-10857. [PMID: 35914249 DOI: 10.1021/acs.joc.2c01122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inspired by OxdA that operates biocatalytic aldoxime dehydration, we have developed an efficient iron catalyst, Cp*Fe(1,2-Cy2PC6H4O) (1), which rapidly converts various aliphatic and aromatic aldoximes to nitriles with release of H2O at room temperature. The catalysis involves redox activation of the N-O bond by a 1e- transfer from the iron catalyst to the oxime. Such redox-mediated N-O cleavage was demonstrated by the isolation of a ferrous iminato intermediate from the reaction of the ketoxime substrate. This iron-catalyzed acceptorless dehydration approach represents a general method for the preparation of nitriles, and it also delivers salicylonitriles by catalyzing the Kemp elimination reaction.
Collapse
Affiliation(s)
- Hongjie Gao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Jia-Yi Chen
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Zhiqiang Peng
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,College of Chemistry, Beijing Normal University, Beijing 100875, China
| |
Collapse
|
3
|
Soleymani Movahed F, Foo SW, Mori S, Ogawa S, Saito S. Phosphorus-Based Organocatalysis for the Dehydrative Cyclization of N-(2-Hydroxyethyl)amides into 2-Oxazolines. J Org Chem 2021; 87:243-257. [PMID: 34882422 DOI: 10.1021/acs.joc.1c02318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A metal-free, biomimetic catalytic protocol for the cyclization of N-(2-hydroxyethyl)amides to the corresponding 2-oxazolines (4,5-dihydrooxazoles), promoted by the 1,3,5,2,4,6-triazatriphosphorine (TAP)-derived organocatalyst tris(o-phenylenedioxy)cyclotriphosphazene (TAP-1) has been developed. This approach requires less precatalyst compared to the reported relevant systems, with respect to the phosphorus atom (the maximum turnover number (TON) ∼ 30), and exhibits a broader substrate scope and higher functional-group tolerance, providing the functionalized 2-oxazolines with retention of the configuration at the C(4) stereogenic center of the 2-oxazolines. Widely accessible β-amino alcohols can be used in this approach, and the cyclization of N-(2-hydroxyethyl)amides provides the desired 2-oxazolines in up to 99% yield. The mechanism of the reaction was studied by monitoring the reaction using spectral and analytical methods, whereby an 18O-labeling experiment furnished valuable insights. The initial step involves a stoichiometric reaction between the substrate and TAP-1, which leads to the in situ generation of the catalyst, a catechol cyclic phosphate, as well as to a pyrocatechol phosphate and two possible active intermediates. The dehydrative cyclization was also successfully conducted on the gram scale.
Collapse
Affiliation(s)
| | - Siong Wan Foo
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Shogo Mori
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Saeko Ogawa
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Susumu Saito
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan.,Research Center for Materials Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| |
Collapse
|
4
|
Zhang W, Yang W, Zhao W. Lewis acid-promoted site-selective cyanation of phenols. Org Biomol Chem 2021; 18:4604-4609. [PMID: 32515758 DOI: 10.1039/d0ob00737d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An efficient Lewis acid-promoted site-selective electrophilic cyanation of 3-substituted and 3,4-disubstituted phenols has been developed. The cyanation reactions using MeSCN as the cyanating reagent proceeded efficiently to afford a wide range of 2-hydroxybenzonitriles with high efficiency and excellent regioselectivity. This protocol could provide a practical method for the synthesis and modification of biologically active molecules.
Collapse
Affiliation(s)
- Wu Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Wen Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, P. R. China.
| | - Wanxiang Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, P. R. China.
| |
Collapse
|
5
|
Schachner JA, Belaj F, Mösch-Zanetti NC. Isomers in chlorido and alkoxido-substituted oxidorhenium(v) complexes: effects on catalytic epoxidation activity. Dalton Trans 2020; 49:11142-11149. [PMID: 32743619 DOI: 10.1039/d0dt02352c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses and characterizations of oxidorhenium(v) complexes trans-dichlorido [ReOCl2(PPh3)(L1a)] (trans-2a), cis-dichlorido [ReOCl2(PPh3)(L1b)] (cis-2b) and ethoxido-complex [ReO(OEt)(L1b)2] (4b), ligated with the dimethyloxazoline-phenol ligands HL1a and HL1b are described. The bidentate ligand HL1a (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-phenol) is unsubstituted on the phenol ring; ligand HL1b (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-4-nitrophenol) contains a nitro group in para-position to the hydroxy group. In the reaction of precursor complex [ReOCl3(PPh3)2] and HL1a the two stereoisomers cis/trans-2a, with respect to chlorido ligands, are formed. The solid state structures of both isomers cis- and trans-2a were determined by single crystal X-ray diffraction analysis. In contrast, with ligand HL1b, only the cis-isomer cis-2b was obtained. Ethoxido-complex 4b is exclusively obtained when precursor [ReOCl3(OPPh3)(SMe2)] is reacted with 2 equiv. of HL1b in ethanol in the presence of the base 2,6-dimethylpyridine (lutidine). If no lutidine is added, chlorido-complex [ReOCl(L1b)2] (3b) is obtained. Complexes [ReOCl2(PPh3)(L1a)] (cis/trans-2a), [ReOCl2(PPh3)(L1b)] (cis-2b), [ReO(OMe)(L1a)2] (4a) and [ReO(OEt)(L1b)2] (4b) were tested as homogeneous catalysts in the benchmark reaction of cyclooctene epoxidation. The influence of isomerism and effects of ligand substitutions on catalytic activity was investigated. Based on the time-conversion plots it can be concluded that cis/trans-isomerism does not influence catalytic activity, but electron-withdrawing substituents, as in cis-2b, 3b and 4b, show a beneficial effect.
Collapse
Affiliation(s)
- Jörg A Schachner
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - Ferdinand Belaj
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - Nadia C Mösch-Zanetti
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| |
Collapse
|
6
|
Bartáček J, Váňa J, Drabina P, Svoboda J, Kocúrik M, Sedlák M. Recoverable polystyrene-supported palladium catalyst for construction of all-carbon quaternary stereocenters via asymmetric 1,4-addition of arylboronic acids to cyclic enones. REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
7
|
Zhang W, Yang W, Zhao W. Lewis Acid Mediated Electrophilic Cyanation of 2,2'-Biphenols. J Org Chem 2020; 85:8702-8713. [PMID: 32512992 DOI: 10.1021/acs.joc.0c00458] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A Lewis acid mediated electrophilic cyanation of 2,2'-biphenols with a trifluoromethanesulfonyl (Tf) protecting group is reported. The cyanation reactions with less toxic, commercially available MeSCN as a cyanating reagent afforded a range of 3-cyan-2,2'-biphenols in moderate to high yields. The use of trifluoromethanesulfonyl (Tf) as a protecting group is crucial to the success of this transformation. Moreover, the cyanated products were readily transformed into various synthetically useful molecules. This protocol features high efficiency, excellent regioselectivity, and good functional group compatibility and may provide a practical tool for the synthesis and modification of biologically active compounds, catalysts, and ligands.
Collapse
Affiliation(s)
- Wu Zhang
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Wen Yang
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Wanxiang Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| |
Collapse
|
8
|
Zhang W, Li T, Wang Q, Zhao W. Lewis Acid‐Mediated Cyanation of Phenols Using
N
‐Cyano‐
N
‐phenyl‐
p‐
toluenesulfonamide. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900813] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Wu Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan University, Changsha Hunan 410082 People's Republic of China
| | - Tao Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan University, Changsha Hunan 410082 People's Republic of China
| | - Qingli Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan University, Changsha Hunan 410082 People's Republic of China
| | - Wanxiang Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical EngineeringHunan University, Changsha Hunan 410082 People's Republic of China
| |
Collapse
|
9
|
Schachner JA, Berner B, Belaj F, Mösch-Zanetti NC. Stereoisomers and functional groups in oxidorhenium(v) complexes: effects on catalytic activity. Dalton Trans 2019; 48:8106-8115. [PMID: 31017170 DOI: 10.1039/c9dt01352k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses of oxidorhenium(v) complexes [ReOCl(L1a-c)2] (3a-c), equipped with the bidentate, mono-anionic phenol-dimethyloxazoline ligands HL1a-c are described. Ligands HL1b-c contain functional groups on the phenol ring, compared to parent ligand 2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-phenol H1a; namely a methoxy group ortho to the hydroxyl position (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-6-methoxyphenol, H1b), or a nitro group para to the hydroxyl position (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-4-nitrophenol, H1c). Furthermore, oxidorhenate(v) complexes (NBu4)[ReOCl3(L1a-b)] (2a-b) were synthesized for solid state structural comparisons to 3a-b. All novel complexes are fully characterized including NMR, IR and UV-Vis spectroscopy, MS spectrometry, X-ray crystallography, elemental analysis as well as cyclic voltammetry. The influence of functional groups (R = -H, -OMe and -NO2) on the catalytic activity of 3a-c was investigated in two benchmark catalytic reactions, namely cyclooctene epoxidation and perchlorate reduction. In addition, the previously described oxidorhenium(v) complex [ReOCl(oz)2] (4), employing the phenol-oxazoline ligand 2-(4,5-dihydro-2-oxazolyl)phenol Hoz, was included in these catalysis studies. Complex 4 is a rare case in oxidorhenium(v) chemistry where two stereoisomers could be separated and fully characterized. With respect to the position of the oxazoline nitrogen atoms on the rhenium atom, these two stereoisomers are referred to as N,N-cis and N,N-trans isomer. A potential correlation between spectroscopic and structural data to catalytic activity was evaluated.
Collapse
Affiliation(s)
- J A Schachner
- Institute of Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - B Berner
- Institute of Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - F Belaj
- Institute of Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - N C Mösch-Zanetti
- Institute of Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| |
Collapse
|
10
|
Pujari PL, Thorat PV, Mahipal AB, Bhondwe RS. Highly Efficient Microwave-assisted One-Pot Synthesis of Aromatic Nitriles from Aromatic Aldehydes. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2019. [DOI: 10.1134/s1070428019050191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Sayama S. Oxidative Syntheses and Ring Opening of Oxazolines and Related Compounds by Ammonium Tribromide. HETEROCYCLES 2017. [DOI: 10.3987/rev-17-866] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
12
|
Wang J, Huang C, Gao K, Wang X, Liu M, Ma H, Wu J, Hou H. Microcrystalline Zinc Coordination Polymers as Single-site Heterogeneous Catalysts for the Selective Synthesis of Mono-oxazolines from Amino Alcohol and Dinitriles. Chem Asian J 2016; 11:1856-62. [DOI: 10.1002/asia.201600434] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Junning Wang
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Chao Huang
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Kuan Gao
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Xiaolu Wang
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Mengjia Liu
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Haoran Ma
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Jie Wu
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| | - Hongwei Hou
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou China
| |
Collapse
|
13
|
Huang C, Wang H, Wang X, Gao K, Wu J, Hou H, Fan Y. Surfactant-Assisted Nanocrystalline Zinc Coordination Polymers: Controlled Particle Sizes and Synergistic Effects in Catalysis. Chemistry 2016; 22:6389-96. [DOI: 10.1002/chem.201505009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Chao Huang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Huarui Wang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Xiaolu Wang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Kuan Gao
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Jie Wu
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Hongwei Hou
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| | - Yaoting Fan
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Henan 450052 P.R. China
| |
Collapse
|
14
|
Deb ML, Pegu CD, Borpatra PJ, Baruah PK. Copper catalyzed oxidative deamination of Betti bases: an efficient approach for benzoylation/formylation of naphthols and phenols. RSC Adv 2016. [DOI: 10.1039/c6ra04567g] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
A copper-catalyzed benzoylation/formylation of naphthols and phenols via oxidative deamination of Betti bases.
Collapse
Affiliation(s)
- Mohit L. Deb
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Choitanya Dev Pegu
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Paran J. Borpatra
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Pranjal K. Baruah
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| |
Collapse
|
15
|
Kitamura M, Sakata R, Tashiro N, Ikegami A, Okauchi T. Synthesis of Diazonaphthoquinones from Naphthols by Diazo-Transfer Reaction. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20150021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Rie Sakata
- Department of Applied Chemistry, Kyushu Institute of Technology
| | | | - Azusa Ikegami
- Department of Applied Chemistry, Kyushu Institute of Technology
| | - Tatsuo Okauchi
- Department of Applied Chemistry, Kyushu Institute of Technology
| |
Collapse
|
16
|
Whiting E, Lanning ME, Scheenstra JA, Fletcher S. Chromatography-Free Entry to Substituted Salicylonitriles: Mitsunobu-Triggered Domino Reactions of Salicylaldoximes. J Org Chem 2014; 80:1229-34. [DOI: 10.1021/jo502396u] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ellis Whiting
- School
of Chemistry, University of Cardiff, Cardiff CF10 3AT, U.K
| | - Maryanna E. Lanning
- Department
of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 N. Pine Street, Baltimore, Maryland 21201, United States
| | - Jacob A. Scheenstra
- Department
of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 N. Pine Street, Baltimore, Maryland 21201, United States
| | - Steven Fletcher
- Department
of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 N. Pine Street, Baltimore, Maryland 21201, United States
- University of Maryland Greenebaum Cancer Center, 22 S. Greene Street, Baltimore, Maryland 21201, United States
| |
Collapse
|
17
|
Aspinall HC, Bacsa J, Beckingham OD, Eden EGB, Greeves N, Hobbs MD, Potjewyd F, Schmidtmann M, Thomas CD. Adding the right (or left) twist to tris-chelate complexes – coordination chemistry of chiral oxazolylphenolates with M3+ions (M = Al or lanthanide). Dalton Trans 2014; 43:1434-42. [DOI: 10.1039/c3dt52366g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Streit U, Birbaum F, Quattropani A, Bochet CG. Photocycloaddition of Arenes and Allenes. J Org Chem 2013; 78:6890-910. [DOI: 10.1021/jo4002307] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ursula Streit
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700
Fribourg, Switzerland
| | - Frédéric Birbaum
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700
Fribourg, Switzerland
| | - Anna Quattropani
- Merck Serono S.A., Chemin des Mines 9, CH-1202 Geneva,
Switzerland
| | - Christian G. Bochet
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700
Fribourg, Switzerland
| |
Collapse
|
19
|
Ebru Aydin A, Yuksekdanaci S. Asymmetric Henry reactions catalyzed by metal complexes of chiral oxazoline based ligands. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2012.11.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
20
|
Aspinall HC, Bacsa J, Jones AC, Wrench JS, Black K, Chalker PR, King PJ, Marshall P, Werner M, Davies HO, Odedra R. Ce(IV) complexes with donor-functionalized alkoxide ligands: improved precursors for chemical vapor deposition of CeO2. Inorg Chem 2011; 50:11644-52. [PMID: 22017450 DOI: 10.1021/ic201593s] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thin films of ceria (CeO(2)) have many applications, and their synthesis by liquid-injection MOCVD (metal-organic chemical vapor deposition) or ALD (atomic layer deposition) requires volatile precursor compounds. Here we report the synthesis of a series of homoleptic and heteroleptic Ce(IV) complexes with donor-functionalized alkoxide ligands mmp (1-methoxy-2-methylpropan-2-olate), dmap (1-(dimethylamino)propan-2-olate), and dmop (2-(4,4-dimethyl-4,5-dihydrooxazol-2-yl)propan-2-olate) and their potential as precursors for MOCVD and ALD of CeO(2). New complexes were synthesized by alcohol exchange reactions with [Ce(OBu(t))(4)]. [Ce(mmp)(4)] and [Ce(dmap)(4)] were both found to be excellent precursors for liquid-injection MOCVD of CeO(2), depositing high purity thin films with very low carbon contamination, and both have a large temperature window for diffusion controlled growth (350-600 °C for [Ce(mmp)(4)]; 300-600 °C for [Ce(dmap)(4)]). [Ce(mmp)(4)] is also an excellent precursor for liquid-injection ALD of CeO(2) using H(2)O as oxygen source and demonstrates self-limiting growth from 150 to 350 °C. [Ce(dmap)(4)] has lower thermal stability than [Ce(mmp)(4)] and does not show self-limiting growth in ALD. Heteroleptic complexes show a tendency to undergo ligand redistribution reactions to form mixtures in solution and are unsuitable as precursors for liquid-injection CVD.
Collapse
Affiliation(s)
- Helen C Aspinall
- Department of Chemistry, Donnan and Robert Robinson Laboratories, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|