作者:Andryj M. Borys、Ella F. Rice、Gary S. Nichol、Michael J. Cowley
DOI:10.1021/jacs.1c06228
日期:2021.9.8
phospha-bora-Wittig reaction for the direct preparation of phosphaalkenes from aldehydes, ketones, esters, or amides. The transient phosphaborene Mes*P═B–NR2 reacts with carbonyl compounds to form 1,2,3-phosphaboraoxetanes, analogues of oxaphosphetane intermediates in the classical Wittig reaction. 1,2,3-Phosphaboraoxetanes undergo thermal or Lewis acid-promoted cycloreversion, yielding phosphaalkenes.
Preparation and Characterization of P<sub>2</sub>
BCh Ring Systems (Ch=S, Se) and Their Reactivity with N-Heterocyclic Carbenes
作者:Cameron M. E. Graham、Clément R. P. Millet、Amy N. Price、Juuso Valjus、Michael J. Cowley、Heikki M. Tuononen、Paul J. Ragogna
DOI:10.1002/chem.201704337
日期:2018.1.12
Four‐membered rings with a P2BCh core (Ch=S, Se) have been synthesized by the reaction of phosphinidene chalcogenide (Ar*P=Ch) and phosphaborene (Mes*P=BNR2). The mechanistic pathways towards these rings are explained by detailed computational work that confirmed the preference for the formation of P−P, not P−B, bonded systems, which seems counterintuitive given that both phosphorus atoms contain bulky
通过次膦硫属元素化物(Ar * P = Ch)和磷杂环丁烯(Mes * P = BNR 2)的反应合成了具有P 2 BCh核的四元环(Ch = S,Se )。通过详细的计算工作解释了通向这些环的机制途径,这些工作证实了形成P-P而不是P-B键合体系的偏好,鉴于两个磷原子都含有庞大的配体,这似乎是违反直觉的。新合成的杂环以及已知的(RPCh)n个环的反应性(n= 2,3),是通过添加N-杂环卡宾来探测的,这表明所有研究的化合物都可以充当低配位磷物种的来源。