Stereochemistry of alkaline hydrolyses of 1,3,2-oxazaphospholidine-2-thiones and related reactions
作者:C. Richard Hall、Thomas D. Inch
DOI:10.1039/p19810002368
日期:——
preference to oxygen. A term, apical potentiality, introduced to refer to apical preference during reactions, is intended to be quite distinct from the term apicophilicity which describes apical preference in stable phosphoranes. S-Alkyl groups are displaced from NN-dialkyl phosphoramidothioates with retention of configuration, but with inversion in the corresponding phosphono-derivatives.
在保留2-环氧基-1,3,2-氧杂氮磷吡啶-2-硫酮的碱性水解过程中,发生内环P-O键的基本排他性切割,并保留了其构型。在2-甲基类似物中,PO键断裂的同时存在构型的反转和保留,并且也是通过PN键断裂的产物转化而得到的。这些结果与反应机理相一致,该反应机理要求在与氮相反的磷而不是氧上对磷进行亲核攻击。引入的术语“顶电位”是指反应过程中的顶偏性,旨在与术语“亲液性”截然不同,后者描述了在稳定的磷烷中的顶偏性。S-烷基从NN取代-二烷基磷酰胺基硫代酸酯具有保留的构型,但是在相应的膦酰基衍生物中具有倒位。