Ni‐Catalyzed Regioselective Cyclotrimerization of Internal Esteryl Alkynes towards Polysubstituted Benzene Rings
作者:Chao Hou、Yan Ma、Yongqi Zhang、Huiling Xu、Yuanqi Wu、Jinbo Zhao、Yuchao Wang、Yu Liu
DOI:10.1002/hlca.202200005
日期:2022.5
Transition-metal-catalyzed [2+2+2] cycloaddition of alkynes is a core synthetic approach to benzene rings. Herein we describe an efficient system based on inexpensive nickel catalyst and phosphine ligand that facilitate cyclotrimerization of various internal esteryl alkynes. The regioselectivity of the protocol was precisely controlled, and a series of polysubstituted benzene rings mainly composed
Synthesis and catalytic activity of rhodium diene complexes bearing indenyl-type fullerene η5-ligand
作者:Motoki Toganoh、Yutaka Matsuo、Eiichi Nakamura
DOI:10.1016/s0022-328x(03)00465-0
日期:2003.10
Rhodium eta(5)-complexes bearing an indenyl-type fullerene ligand, Rh[C-60(PhCH2)(2)Ph](cod) (2), Rh[C-60(PhCH2)(2)Ph](nbd) (3) and Rh(C70Ph3)(cod) (4), have been synthesized from the corresponding fullerene tri-adducts in 93-96% yields. X-ray crystallographic analysis of 4 indicated that the structure of 4 is similar to that of Rh(Ind)(cod). The rhodium complex 2 catalyzes alkyne trimerization reactions and hydroboration reactions. (C) 2003 Elsevier B.V. All rights reserved.