title: (Aminomethyl)pyridine Complexes for the Cobalt-Catalyzed Anti-Markovnikov Hydrosilylation of Alkoxy- or Siloxy(vinyl)silanes with Alkoxy- or Siloxyhydrosilanes.
abstract: Cobalt-catalyzed anti-Markovnikov reactions that involve siloxy- or alkoxy(vinyl)silanes and siloxy- or alkoxyhydrosilanes are disclosed. More than 25 new cobalt-(aminomethyl)pyridine complexes were developed as catalysts for the hydrosilylation of industry-relevant and challenging siloxy- or alkoxy-terminated vinylsilanes. These transformations typically proceed in the presence of 0.25 mol % of the cobalt complex with 0.75 mol % of the alkylating agent to afford the desired products in up to >98 % yield with >98 % anti-Markovnikov selectivity in 30 min. The current protocol shows a broad substrate scope, delivering more than 25 siloxanes with siloxy or alkoxy functional groups at both termini, and can also be applied to polymeric vinyl- and hydrosiloxanes.
authors.affiliation: Core R&D, The Dow Chemical Company, 2200 West Salzburg Road, Auburn, MI, 48611, USA.
authors.forename: Kangsang L
authors.identifier: 0000-0001-8693-0118
authors.initials: KL
authors.lastname: Lee
keywords: alkoxy(vinyl)silanes; alkoxysilanes; cobalt catalysis; hydrosilylation; siloxanes