Facile Regio- and Stereoselective Hydrometalation of Alkynes with a Combination of Carboxylic Acids and Group 10 Transition Metal Complexes: Selective Hydrogenation of Alkynes with Formic Acid
作者:Ruwei Shen、Tieqiao Chen、Yalei Zhao、Renhua Qiu、Yongbo Zhou、Shuangfeng Yin、Xiangbo Wang、Midori Goto、Li-Biao Han
DOI:10.1021/ja2069246
日期:2011.10.26
highly stereo- and regioselective hydrometalation of alkynes generating alkenylmetal complex is disclosed for the first time from a reaction of alkyne, carboxylic acid, and a zerovalent group10 transition metal complex M(PEt(3))(4) (M = Ni, Pd, Pt). A mechanistic study showed that the hydrometalation does not proceed via the reaction of alkyne with a hydridometal generated by the protonation of a
Reactions of tetrakis(substituted phosphine)-palladium (O) with fluorocarbons
作者:V.A. Mukhedkar、A.J. Mukhedkar
DOI:10.1016/0022-1902(81)80620-3
日期:1981.1
Treatment of tetrakis(substituted phosphine)-palladium (in brief PdL4) with C2F3X gave a complex containing (i) 3-membered metalocyclic ring, (ii) perfluorovinyl group or (iii) only X groups depending on the nature of the substituted phosphine. Reaction of PdL4 with (CF3)2CO and (CF3)2 gave complexes containing 3-membered and 5-membered metalocylic ring. Vinyl rearrangement of L2PdC(CF3)2C(CN)2 was
Efficient Pd-Catalyzed Dehydrogenative Coupling of P(O)H with RSH: A Precise Construction of P(O)–S Bonds
作者:Yueyue Zhu、Tieqiao Chen、Shan Li、Shigeru Shimada、Li-Biao Han
DOI:10.1021/jacs.6b03112
日期:2016.5.11
A Pd-catalyzed dehydrogenative phosphorylation of thiols is developed. A variety of thiols dehydrogenatively couple readily with all three kinds of P(O)-H compounds, i.e., H-phosphonates, H-phosphinates, and secondary phosphine oxides, providing a general access to the valuable phosphorothioates including the P-chiral compounds. A plausible mechanism is proposed.
in each case metal stannylene complexes were formed first and that the disilylstannylene/silastannene rearrangement occurs only after complexation to the group 10 metal. The isomerization is a two-stepprocess with relatively small barriers, suggesting a thermodynamic control of product formation. In addition, the results of the computational investigation revealed a subtle balance of steric and electronic
Hydrophosphorylation of Alkynes Catalyzed by Palladium: Generality and Mechanism
作者:Tieqiao Chen、Chang-Qiu Zhao、Li-Biao Han
DOI:10.1021/jacs.8b00550
日期:2018.2.28
H-phosphonates disfavored the addition. For H-phosphinates and secondary phosphine oxides, Pd/dppe/Ph2P(O)OH was the catalyst of choice, which led to highly regioselective formation of the Markovnikov adducts. By using Pd(PPh3)4 as the catalyst, hypophosphinic acid added to terminal alkynes to give the corresponding Markovnikov adducts. Phosphinic acids, phosphonic acid, and its monoester were not applicable