已经测量了从广泛的路易斯碱硼烷加合物中置换 BH 3的奎宁环动力学。这些速率的参数化使得能够开发出离核量表 (NF B ),以量化和预测一系列其他路易斯碱基的离去基团能力。在多个系列 R' 3– n R n X (X = P, N; R' = 芳基, 烷基) 中观察到的可加性允许制定相关的取代基参数 ( n f PB , n f AB ),提供了一种方法计算N F B一系列路易斯碱基的值远远超出了实验得出的值。通过取代基参数n f PB与一系列烷基和芳基 MIDA 硼酸盐在中性条件下的水解速率的相关性,探索了核离性参数的效用。这允许鉴定具有接近反应中心的杂原子的 MIDA 硼酸盐,显示出不寻常的动力学不稳定性或水解稳定性。
Herein, by applying visible-light photoredoxcatalysis, we have achieved the catalytic deaminativealkylation of diphenylphosphine and phenyl phosphine with benzylamine-derived Katritzky salts at room temperature. The use of Eosin Y as photoredox catalyst and visiblelight can largely promote the reaction. A series of unsymmetrical tertiary phosphines were successfully synthesized, including phosphines
在此,通过应用可见光光氧化还原催化,我们实现了二苯基膦和苯基膦与苄胺衍生的 Katritzky 盐在室温下的催化脱氨基烷基化反应。使用曙红 Y 作为光氧化还原催化剂和可见光可以大大促进反应。成功合成了一系列不对称的叔膦,包括具有三种不同取代基的膦,这些取代基很难获得。
Selective P-C bond cleavage of tertiary phosphine boranes by sodium
作者:Jian-Qiu Zhang、Jing-Jing Ye、Li-Biao Han
DOI:10.1080/10426507.2021.1948851
日期:2021.11.2
Abstract Herein reported is the facial modification of tertiary phosphine boranes R3PBH3 by selective cleaving the P-Ph bond by sodium in which the phosphide borohydride R2PNa(BH3) is quantitatively generated and could be easily quenched by electrophiles to furnish a series of new phosphine boranes in high yields.
摘要 本文报道了通过钠选择性裂解 P-Ph 键对叔膦硼烷 R 3 PBH 3进行表面改性,其中定量生成磷化物硼氢化物 R 2 PNa(BH 3 ),并且可以很容易地被亲电试剂淬灭以提供一系列高产率的新型膦硼烷。
Nickel-catalysed diversification of phosphine ligands by formal substitution at phosphorus
作者:Sven Roediger、Sebastian U. Leutenegger、Bill Morandi
DOI:10.1039/d2sc02496a
日期:——
We report a diversification strategy that enables the direct substituent exchange of tertiary phosphines. Alkylated phosphonium salts, prepared by standard alkylation of phosphines, are selectively dearylated in a nickel-catalysed process to access alkylphosphine products via a formal substitution at the phosphorus center. The reaction can be used to introduce a wide range of alkyl substituents into
Radical Phosphorylation of Aliphatic C–H Bonds via Iron Photocatalysis
作者:Guang-Da Xia、Zi-Kui Liu、Yu-Lian Zhao、Feng-Cheng Jia、Xiao-Qiang Hu
DOI:10.1021/acs.orglett.3c01824
日期:2023.7.21
The synthesis of tertiary phosphines(III) has been a long-standing challenge in synthetic chemistry because of inevitable issues including harsh conditions, sensitive organometallic reagents, and prefunctionalized substrates in traditional synthesis. Herein, we report a strategically novel C(sp3)–H bond phosphorylation that enables the assembly of structurally diverse tertiary phosphines(III) from industrial
iron-catalyzed C(sp3)–H phosphorylation reaction enabled by a photoinduced ligand-to-metal charge transfer (LMCT) process. The reaction exhibits remarkably broad substrate scope (>66 examples), including various alkanes, halides, ketones, esters, nitriles, ethers, thioethers, and silanes as viable substrates. Notably, unconventional site selectivity of C–H phosphorylation is achieved, with the occurrence of