Development of a New Catalyst for the Distannation of Alkynes

Abstract

An added bonus in the optimization of a catalyst for the hydrostannation with tin hydrides was the discovery that molybdenum isonitrile complexes are also suitable for distannations. Further developments in this respect led to a new tungsten isonitrile complex, which catalyzed this reaction highly efficiently and selectively (see scheme, THP=tetrahydropyranyl).

Element−Element Additions to Unsaturated Carbon−Carbon Bonds Catalyzed by Transition Metal Complexes

“…Distannation of triple bonds can also be performed starting from trialkyltin hydride as a result of metal-catalyzed decomposition of the hydride to give distannane and hydrogen …”

Multinuclear cobalt-salen complexes with phenylene linker for epoxide polymerizations

“…1). [25][26][27][28][29][30] Accordingly, proximity effect should operate in epoxide polymerizations with bimetallic catalysts, accomplishing efficient polymerization systems. In fact, Coates and coworkers achieved high activity and enantioselectivity in epoxide homopolymerization using dinuclear Co-salen complexes.…”

Stannylation Reactions under Base Metal Catalysis: Some Recent Advances

“…A pentacarbonyltungsten complex bearing one electron-accepting isocyanide ligand, 4-nitrophenyl isocyanide, proved to be a potent catalyst for the distannylation of alkynes (Scheme 40). 47 The selectivity for the formation of distannylated products was appreciably high, and various propargyl-functionalized terminal alkynes were readily transformed into (Z)-vic-distannylalkenes in a stereoselective manner by treating with Bu 3 SnH under W(CO) 5 (4-O 2 NC 6 H 4 NC) catalysis with scarce production of hydrostannylation products.…”