Investigations of the nucleophilic displacement at the tetrahedral phosphorus - kinetic effects of the nucleophile for a given stereochemistry
作者:Robert J.P Corriu、Gerard F. Lanneau、Dominique Leclercq
DOI:10.1016/s0040-4020(01)88163-1
日期:1986.1
reproduced when the leaving group is different of the nucleophile. We suggest that the mechanistic implications, established in the case of phosphate esters hydrolysis cannot be directly extended to the general case of SN2(P). The mechanism of nucleophilic substitution of P(4) species is better interpreted in terms of HOMO-LUMO interactions between the nucleophile and the substrate, a process now well established
动力学研究2-氯-2-氧代-1,3,2-二氧杂膦烷的醇解和氨解反应,显示了亲核试剂的速率调节作用,其中立体化学是保留在磷上。另一方面,通过2-氯-2-氧代-1,3,2-二氧杂磷烷基或二乙基氯磷酸酯的反转取代显示亲核试剂对反应性的显着影响。此外,当离去基团与亲核试剂不同时,与磷酸酯相比,五元环磷酯的水解所观察到的大速率增加没有再现(氧气总是置换氧气)。我们建议,在磷酸酯水解的情况下建立的机理意义不能直接扩展到S的一般情况。N 2(P)。P(4)物种的亲核取代机制可以通过亲核体与底物之间的HOMO-LUMO相互作用更好地解释,这一过程现已在硅化学中得到了很好的确立。