Diphenyl diselenide (PhSeSePh) was effective as a pre-catalyst for the vicinal dichlorination of α,β-unsaturated phosphonates with sulfuryl chloride. The reaction conditions were mild and the desired products were formed in up to 93% yield and moderate diastereoselectivity (10 : 1). The important diphenylselenium dichloride intermediate was obtained and characterized by X-ray crystallography.
Selective Addition of P(O)–H Bonds to Alkynes Catalyzed by Transition Metals Immobilized on Polystyrene-bound Triphenylphosphine
作者:Tieqiao Chen、Yongbo Zhou、Cancheng Guo、Li-Biao Han
DOI:10.1246/cl.130374
日期:2013.9.5
Addition of P(O)–H bonds to alkynescatalyzed by transition metals (Rh, Pd, and Ni) immobilized on polystyrene-bound triphenylphosphine proceeded efficiently to afford high yields of the addition p...
Hydrophosphonylation of Alkynes with Trialkyl Phosphites Catalyzed by Nickel
作者:Rosa E. Islas、Juventino J. García
DOI:10.1002/cctc.201700974
日期:2017.11.9
The use of simple and inexpensive NiCl2⋅6 H2O as a catalyst precursor for C−P bond formation in the presence of commercially available trialkyl phosphites (P(OR)3, R=Et, iPr, Bu, SiMe3) along with several alkynes is presented. Control experiments showed the in situ formation of (RO)2P(O)H as the species that undergo the addition into the C≡C bond at the alkynes to yield the product of P−H addition
利用简单且廉价的NiCl的2 ⋅6ħ 2在市售的三烷基亚磷酸酯的存在O作为催化剂前体对C-P键的形成(P(OR)3,R =的Et,我镨,卜,森达3)以及几种炔烃。对照实验表明,原位形成(RO)2 P(O)H,是在炔烃中经过CROC键加成后生成PH加成物的物种。二苯乙炔与P(OEt)3,P(O i Pr)3和P(OSiMe 3)3的氢膦酰基化无需特定的溶剂或配体,即可以高收率(> 92%)进行合成。该方法可用于制备作为末端炔烃模型的苯乙炔和内部炔烃的有机膦酸酯,其收率范围从良好到中等。
Mono and double Mizoroki–Heck reaction of aryl halides with dialkyl vinylphosphonates using a reusable palladium catalyst under aqueous medium
reusable Pd-catalyzed mono and double Mizoroki–Heckreactions of aryl halides and dialkyl vinylphosphonates using iPr2NH as a base in aqueous medium under air were developed. For aryl iodides, the reaction could be conducted at 80 °C under a low catalyst loading (0.1–1 mol%). When aryl bromides were applied, however, a greater amount of catalyst (5 mol%) and a longer reaction time at 120 °C were required.