the novel Schiff bases (1S,2R)-R1CH═NCH(Me)CH(OH)Ph [with R1 = ferrocenyl-[Fc (2b)], 5- or 3-methylthienyl [hereafter referred to as 5-MeTf and 3-MeTf (2c and 2d), respectively]] are reported. NMR studies show the existence of a tautomeric equilibrium between these imine forms (2b−d) and 2-substituted 4-methyl-5-phenyloxazolidines. The comparison of the results reveals that the molar ratios imine/oxazolidines
将溶液行为和光谱性质的新颖席夫碱的(1小号,2 - [R)-R 1 = NCH(ME)CH(OH)PH [其中R 1 = ferrocenyl- [的Fc(图2b)],5-或报道了
3-甲基噻吩基[以下分别称为5-MeTf和3-MeTf(2c和2d)]。NMR研究表明,这些
亚胺形式(2b - d)与2-取代的4-甲基-
5-苯基恶唑烷之间存在互变异构平衡。结果的比较表明,
亚胺/
恶唑烷的摩尔比(K):(a)取决于溶剂和温度,(b)高于(1 S,2 R)-PhCH═NCH(Me)CH(OH)Ph(2e),(c)受R 1基团性质的强烈影响,(d)根据序列Ph