Synthesis and characterisation of severely hindered P-OR compounds
摘要:
P-Cl substrates were converted into their P-OR analogues from hindered alcohols using an amine base. Where the system was severely hindered, more forcing conditions were required that necessitated the presence of a metal alkoxide nucleophile before successful reactions were observed. In some instances, the products were thermally unstable and reverted to alkenes by elimination reactions, while others were sensitive to moisture. Here, hydrolysis products prevailed if moisture was not rigorously excluded. Details are presented to obtain the P(III) and P(V) esters, diesters and half esters. (C) 2009 Elsevier Ltd. All rights reserved.
新戊基二苯基次膦酸酯与氯甲烷,溴甲烷或碘甲烷的反应以及二戊基苯基次膦酸酯与溴甲烷或碘甲烷的反应产生结晶的烷氧基phosph卤化物。在氘代氯仿中,这些中间体通过一阶过程分解,该过程涉及速率确定卤化phospho离子对的崩溃以及烷基-氧键的S N 2型裂变。氯化物,溴化物和碘化物的比率相似。在离子化程度更高的介质(氘代乙腈)中,离解可导致中间体稳定并偏离一级分解。先前确定的溴化物X射线衍射数据,以及一系列Ph中间体的氘代氯仿中的相对分解速率n(RO) 3– n [MeX] -(n= 0、1或2)表明,烷氧基phosph中间体的稳定性和反应性很大程度上取决于配体的诱导效应而不是介晶效应。在某些情况下,磷上苯氧基取代基的存在可能导致烷基-氧键发生S N 1型裂变。
作者:Imre Petneházy、Gyöngyi Szakál、László Tõke、Harry R Hudson、Luba Powroznyk、Christopher J Cooksey
DOI:10.1016/s0040-4020(01)88645-2
日期:1983.1
separated from the reaction of neopentyl diphenylphosphinite with α-chloroacetophenone at O° and was shown to yield neopentyl chloride and the corresponding Perkow product by a first-order process in chloroform (t12 ca 40min at 33°). It is suggested that the betaine formed by initial attack of phosphorus at the carbonyl carbon atom may be a common first intermediate in reactions that yield both Arbuzov and
Michaelis–Arbuzov intermediates: X-ray crystal structures of the methyl bromide adducts of neopentyl diphenylphosphinite and dineopentyl phenylphosphonite
作者:Kim Henrick、Harry R. Hudson、Aloysius Kow
DOI:10.1039/c39800000226
日期:——
Single crystalX-raystructure determinations of the Michaelis–Arbuzovintermediates Ph2Me(But-CH2O)P+Br– and PhMe(ButCH2O)2P+Br– clearly demonstrate that these species are four-co-ordinate phosphonium salts.
单晶X米氏-阿尔布佐夫的射线结构测定中间体博士2我(卜吨-CH 2 ö)p +溴-和的PhMe(BU吨CH 2 O)2 P +溴-清楚地表明,这些物质的四配位phospho盐。
Asymmetric Organocatalyzed Synthesis of α‐Aminophosphinates via Thiourea Anion‐Binding Catalysis
作者:Cáoimhe J. Niland、Joseph J. Ruddy、Martin P. O'Fearraigh、Eoghan M. McGarrigle
DOI:10.1002/ejoc.202301212
日期:2024.3.18
P-Stereogenic α-aminophosphinates were obtained in high enantioselectivity via anion-binding catalysis with thiourea catalysts, further expanding the range of nucleophiles that can be used in this type of catalysis.