a highly modular, clean, and scalable access to a broad variety of alkynyl sulfides in good‐to‐excellent yields. The utility of this protocol was showcased by the preparation of alkynyl sulfides, which are particularly difficult to obtain or simply unavailable through the existing methodologies. In addition, the synthetic method was extended to the preparation of alkynyl selenides.
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。
The chalcogenoimidazoline complexes NR-CMe-CMe-NR-C=X . M(CO)(5) (VIII-XI; R = Me, iso-Pr; X = S, Se, Te; M = Cr, Mo, W) are obtained from the metal hexacarbonyls (M = Cr, Mo, W) and the chalcogenoimidazolines IV-VIL. ln these complexes the chalcogeno ligands exhibit strong donor properties according to the sequence Te > Se > S which is demonstrated by n. m. r. and i. r. data. The X-ray structures of N(iso-Pr)-CMe-CMe-N(iso-Pr)-C=X . Cr(CO)(5)(X = S; Se; VIIIa, IXa) are reported.