The investigation of substituent effects on the fragmentation pathways of pentacoordinated phenoxyspirophosphoranes by ESI-MS<sup>n</sup>
作者:Xiaoyan Cui、Can Sun、Pei Zhao、Yanyan Wang、Yanchun Guo、Yufen Zhao、Shuxia Cao
DOI:10.1002/jms.4064
日期:2018.4
An electron‐withdrawing substituent at the ortho‐position always results in the removal of a corresponding phenol analogue, while cleavage by spiroring opening becomes the predominant fragmentation pathway if an electron‐donating substituent is at the phenolic group. The substituent effects on the competitive fragmentation pathways were further elucidated by theoretical calculations, single crystal
The Atherton–Todd-type reaction of pentacoordinate hydrospirophosphoranes synthesized from l-valine with phenols was first investigated. A series of new types of phenoxy spirophosphoranes were stereospecifically synthesized and a preliminary stereochemical mechanism was proposed by 31P NMR tracing experiments and X-ray diffraction analysis. The reaction proceeded via the initial generation of chlorinated