Studies of Hindered Rotation in Some Group IV Esters of Dimethylcarbamic and Dimethylthiocarbamic Acids | Zendy

Alberta E. Lemire | Zendy; J. C. Thompson | Zendy

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Studies of Hindered Rotation in Some Group IV Esters of Dimethylcarbamic and Dimethylthiocarbamic Acids

Author(s) -

Alberta E. Lemire,

J. C. Thompson

Publication year - 1975

Publication title -

canadian journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.323

H-Index - 68

eISSN - 1480-3291

pISSN - 0008-4042

DOI - 10.1139/v75-540

Subject(s) - chemistry , steric effects , rotation (mathematics) , group (periodic table) , medicinal chemistry , spectral line , crystallography , stereochemistry , organic chemistry , physics , geometry , mathematics , astronomy

Activation parameters for hindered rotation about the C—N bond have been obtained for some trimethylgermyl, trimethylplumbyl, and tert-butyl esters of N,N-dimethylcarbamic, N,N-dimethylmonothiocarbamic, and N,N-dimethyldithiocarbamic acids. These are compared with previous results for some group IV esters and general considerations as to factors influencing barriers to rotation are discussed. It was found that the degeneracy of the N-methyl resonances observed in the room or low temperature 1 H spectra appeared also to extend to the room temperature 13 C spectra. A 'steric' effect was noted on the carbonyl and thiocarbonyl resonances.

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