Conformational and Chiroptical Properties of N-Nitrosoazetidines
作者:G. V. Shustov、A. Rauk
DOI:10.1021/ja00108a010
日期:1995.1
Optically active N-nitrosoazetidines, containing the isolated nitrosoazetidine chromophore, i.e. (2R)-1-nitroso-2-methylazetidine (2) and (4S)-1-nitroso-2,2-dibutyl-4-methylazetidine (5), are synthesized, and their H-1 NMR, CD, and UV spectra are studied. A topomerization mechanism, structural features, and chiroptical properties of the individual isomers of the parent 1-nitrosoazetidine (1) and its (2R)-2-methyl, (4R)-2,2,4-trimethyl, and (4S)-2,2-diethyl-4-methyl derivatives 2-4 are studied theoretically by means of non-empirical quantum chemical calculations. It is shown that the CD spectra of N-nitrosoazetidines can be interpreted on the basis of the two-position Z,E-equilibrium, taking into account the nonplanarity of the nitrosoazetidine chromophore. The Cotton effect sign of the n-pi* transition at 380 nm is determined by the intrinsic chirality of the chromophore and obeys a spiral rule.
POMAHOBA, N. N.;TALLO, T. G.;BORISENKO, A. A.;BUNDEL, YU. G., XIMIYA GETEROTSIKL. SOED.,(1990) N, S. 914-920
作者:POMAHOBA, N. N.、TALLO, T. G.、BORISENKO, A. A.、BUNDEL, YU. G.
DOI:——
日期:——
Stereochemistry of the methylation of the (11S,4S) and (11S,4R) diastereomers of 4-methyl-1-(?-methylbenzyl)azetidin-2-one
作者:N. N. Romanova、T. G. Tallo、A. A. Borisenko、Yu. G. Bundel'
DOI:10.1007/bf00509703
日期:1990.7
Romanova, N. N.; Tallo, T. G.; Bundel', Yu. G., Russian Journal of Organic Chemistry, 1995, vol. 31, # 3, p. 375 - 377