Synthesis and spectroscopic of triorganostannyl esters of amic acids. Crystal structure of the triphneylstannyl ester of citraconic acid monopyrrolidide
作者:Areila Samuel-Lewis、Peter J. Smith、John.H. Aupers、David C. Povey
DOI:10.1016/0022-328x(91)86246-m
日期:1991.1
triorganostannyl esters. The 119mSn Mössbauer spectra, at 80 K, show them all to be polymers containing pentacoordinate tin atoms and the infrared data at room temperature indicate that the amido carbonyl groups bridge intermoleculary between planar R3Sn moieties. The polymeric structure of the triphenylstannyl ester of citraconic acid monopyrrolidide has been confirmed by an X-ray study.
Acidity control by photoswitching of intramolecular NH···O hydrogenbond using E/Z photoisomerization of cinnamate framework was achieved. According to the photoisomerization, the distance between amide NH and carboxylic oxygen was disgregated, and an intramolecular NH···O hydrogenbond formed in E carboxylate was interrupted in Z compound in DMSO-d 6 solution. The pK a value of Z carboxylicacid was