Cyclic Phosphine Oxides and Phosphinamides from Di-Grignard Reagents and Phosphonic Dichlorides: Modular Access to Annulated Phospholanes
作者:Aaron M. Gregson、Steven M. Wales、Stephen J. Bailey、Anthony C. Willis、Paul A. Keller
DOI:10.1021/acs.joc.5b01476
日期:2015.10.2
The reaction between 1,4-di-Grignard reagents and phosphonous(III) dichlorides is a classical method for the direct synthesis of phospholanes. Reported here is an extension of this approach to the preparation of value-added, annulated phospholane oxides, achieved through the combination of carbocyclic-fused di-Grignardreagents and readily available phosphonic(V) dichlorides. The procedure is amenable
In Situ Phosphine Oxide Reduction: A Catalytic Appel Reaction
作者:Henri A. van Kalkeren、Stefan H. A. M. Leenders、C. Rianne A. Hommersom、Floris P. J. T. Rutjes、Floris L. van Delft
DOI:10.1002/chem.201101563
日期:2011.9.26
reactions in organic chemistry thrive on stoichiometric formation of phosphineoxides from phosphines. To avoid the resulting burden of waste and purification, cyclic phosphineoxides were evaluated for new catalytic reactions based on in situ regeneration. First, the ease of silane‐mediated reduction of a range of cyclic phosphineoxides was explored. In addition, the compatibility of silanes with electrophilic
Organocatalyzed Reduction of Tertiary Phosphine Oxides
作者:Marie-Luis Schirmer、Stefan Jopp、Jens Holz、Anke Spannenberg、Thomas Werner
DOI:10.1002/adsc.201500762
日期:2016.1.7
A novel selective catalytic reduction method of tertiaryphosphineoxides to the corresponding phosphines has been developed. Notably, the reaction proceeds smoothly with low catalyst loadings of 1–5 mol% even at low temperature (70 °C). Under the optimized conditions various phosphineoxides could be selectively reduced and the desired phosphines were usually obtained in excellent yields above 90%
SOLVOLYSIS OF PHOSPHONIUM COMPOUNDS CONTAINING A THIOPHENOXY GROUP LINKED TO PHOSPHORUS
作者:Gunnar Aksnes
DOI:10.1080/10426509608037953
日期:1996.8.1
Abstract A kinetic study of the solvolysis of six alkylphenyl thiophenoxyphosphonium chlorides in 50% water/methanol is reported. The rates of solvolysis, where thiophenol and phosphine oxides are formed, are little influenced by the substituents linked to phosphorus. The present findings are in sharp contrast to the 104 higher rate of the alkaline decomposition of tetraphenyl as compared to tialkylphenyl
Reduction of tertiary phosphine oxides to phosphine-boranes using Ti(Oi-Pr)4/BH3-THF
作者:Sylwia Sowa、K. Michał Pietrusiewicz
DOI:10.1016/j.tet.2021.132057
日期:2021.4
A new method for reduction of tertiaryphosphine oxides leading to the formation of tertiary phosphine-boranes has been developed. The BH3-THF/Ti(Oi-Pr)4 reducing system enables conversion of triaryl, diarylalkyl and trialkylphosphine oxides directly to their borane analogues in good to high yields. In contrast to the previously reported protocols, the presence of activating groups in the structure
已经开发出一种用于还原叔膦氧化物的新方法,该方法导致形成叔膦硼烷。BH 3 -THF / Ti(O i -Pr)4还原系统能够将三芳基氧化物,二芳基烷基氧化物和三烷基膦氧化物直接转化为它们的硼烷类似物,并且产率高至高。与先前报道的方案相反,起始材料的结构中活化基团的存在对于反应的发生不是必需的。该反应是高度立体选择性的,并且主要保留在磷原子处的构型。已经提出了通过BH 3 -THF / Ti(O i -Pr)4还原P O键的合理机理。