CP/MAS spectroscopy in the determination of the tautomeric forms of gossypol, its Schiff bases and hydrazones in the solid state
作者:Piotr Przybylski、Wojciech Schilf、Bohdan Kamienski、Bogumil Brzezinski、Franz Bartl
DOI:10.1002/mrc.2210
日期:2008.6
New Schiff bases and new hydrazones were synthesized and studied by 13C and 15N CP/MAS spectroscopy and by 1H1H COSY, 1H13C HMBC, 1H13C HSQC, 1H15N HMQC and 1H15N HSQC correlations. The CP/MAS investigation of gossypol has demonstrated that in the solid state it exists exclusively in the aldehyde‐aldehyde tautomeric form. In contrast, CP/MAS studies of hydrazones and Schiff bases reveal that these
通过13C和15N CP/MAS光谱以及1H1H COSY、1H13C HMBC、1H13C HSQC、1H15N HMQC和1H15N HSQC相关性合成和研究了新的席夫碱和新的腙。棉酚的 CP/MAS 研究表明,它在固态时仅以醛-醛互变异构形式存在。相比之下,腙和席夫碱的 CP/MAS 研究表明,这些化合物分别以 N-亚胺-N-亚胺和烯胺-烯胺互变异构形式以固态存在。结果表明,C-6、C-7 和 C-11 碳原子的 13C 共振适用于区分固态棉酚氮杂衍生物的互变异构形式。此外,我们已经证明 15N CP/MAS 光谱可用于识别这些互变异构形式。版权所有 © 2008 John Wiley & Sons, Ltd.