RT Journal Article
T1 Searching for highly active cobalt catalysts bearing Schiff base ligands for Markovnikov-selective hydrosilylation of alkynes with tertiary silanes
A1 García Csaky, Aurelio
A1 Skrodzki, Maciej
A1 Ortega Garrido, Víctor
A1 Pawluc, Piotr
AB The search for simple and easy-to-synthesize ligands for bench stable cobalt (pre)catalysts that would ensure high activity and selectivity in alkyne hydrosilylation reactions is an interesting current challenge. Herein, we report that a cobalt(II) complex bearing pyrimidine-imine-2H-imidazole ligand activated by LiHBEt3 exhibits not only high catalytic activity, but also unprecedented tolerance towards tertiary silanes in highly regioselective Markovnikov hydrosilylation of aliphatic and aromatic terminal alkynes to give α-vinylsilanes. In addition, a variety of 1-aryl-2-(trimethylsilyl)acetylenes have been hydrosilylated efficiently by diphenylsilane in the presence of [Co(L)Cl2]/LiHBEt3 catalytic system to yield (E)-1-aryl-1,2-bis(silyl)ethenes with high selectivity. Such selectivity is very rarely observed for cobalt-catalyzed hydrosilylation of silylacetylenes.
PB Elsevier
SN 0021-9517
YR 2022
FD 2022-07
LK https://hdl.handle.net/20.500.14352/113429
UL https://hdl.handle.net/20.500.14352/113429
LA eng
NO Journal of Catalysis Volume 411, July 2022, Pages 116-121
NO Highlights• Series of new hydrosilylation (pre)catalysts based on simple hydrazone Schiff base ligands and cobalt(II) chloride are presented.• Catalytic system based on cobalt(II) complex bearing pyrimidine-imine-2H-imidazole ligand activated by LiHBEt3 has been applied for regioselective hydrosilylation of terminal and internal alkynes.• The possibility of using wide variety of tertiary silanes, functional group tolerance and high selectivity towards α-hydrosilylation products are unique features of the developed methodology.
NO Ministerio de Ciencia, Innovacion y Universidades
DS Docta Complutense
RD 3 abr 2025