Conformational preferences of α-functionalised keten-S,N-acetals: Potential role of SO and SS interactions in solution
摘要:
PMR spectra of carbonyl compounds 2a-k reveal significant variations in the population off and Z Isomers on changing the solvent from CDCl3 to DMSO-d(6). In non-polar media, the intramolecular N-H....O hydrogen bonded form is exclusively observed. In DMSO-d(6), the alternative Z form is also populated. A similar conformational switch is also noted in the corresponding thiones. Different interpretations are critically analysed. The most consistent explanation is suggested to involvean interplay of N-H....X hydrogen bonding and S...X attractive interaction (X=0,S) in these systems. Ah initio calculations support this interpretation.
Synthesis of 2-(1-Arylcarbonyl-1-arylazomethylidene)-thiazolidines by the Reaction of 2-(Arylcarbonyl-methylidene)thiazolidines with Diazobenzenes
作者:Min-De Ruan、Zheng-Jie Wu、Wei-Qiang Fan、Hao Lin
DOI:10.1080/00397919208021111
日期:1992.11
A variety of 2-(1-arylcarbonyl-1-arylazomethylidene)-thiazolidenes were synthesized in excellent yields by the reaction of 2-(arylcarbonylmethylidene)thiazolidines with diazobenzenes.
GUPTA, AKHILESH K.;CHAKRASALI, R. T.;HA, H.;JUNJAPPA, H., SYNTHESIS,(1989) N, C. 141-142
作者:GUPTA, AKHILESH K.、CHAKRASALI, R. T.、HA, H.、JUNJAPPA, H.
DOI:——
日期:——
SPITZNER R.; DILL G.; SCHROTH W.; HENNIG H.; JAMIL K. M., J. PRAKT. CHEM. <JPCE-AO>, 1976, 318, NO 2, 298-312
作者:SPITZNER R.、 DILL G.、 SCHROTH W.、 HENNIG H.、 JAMIL K. M.