title: Synthesis of Triborylalkenes from Terminal Alkynes by Iridium-Catalyzed Tandem C-H Borylation and Diboration.
abstract: A two-step reaction to convert terminal alkynes into triborylalkenes is reported. In the first step, the terminal alkyne and pinacolborane (HBpin) are converted into an alkynylboronate, which is catalyzed by an iridium complex supported by a SiNN pincer ligand. In the second step, treatment of the reaction mixture with CO generates a new catalyst which mediates dehydrogenative diboration of alkynylboronate with pinacolborane. The mechanism of the diboration remains unclear but it does not proceed via intermediacy of hydroboration products or via B2 pin2.
authors.affiliation: Department of Chemistry, Texas A&M University, TAMU - 3255, College Station, TX 77843 (USA) http://www.chem.tamu.edu/rgroup/ozerov/
authors.forename: Chun-I
authors.initials: CI
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Texas A&M University, TAMU - 3255, College Station, TX 77843 (USA) http://www.chem.tamu.edu/rgroup/ozerov/
authors.forename: Wei-Chun
authors.initials: WC
authors.lastname: Shih
authors.affiliation: Department of Chemistry, Harbin Institute of Technology, Harbin 150001 (China).
authors.forename: Jia
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Chemistry, Texas A&M University, TAMU - 3255, College Station, TX 77843 (USA) http://www.chem.tamu.edu/rgroup/ozerov/
authors.forename: Joseph H
authors.initials: JH
authors.lastname: Reibenspies
authors.affiliation: Department of Chemistry, Texas A&M University, TAMU - 3255, College Station, TX 77843 (USA) http://www.chem.tamu.edu/rgroup/ozerov/. ozerov@mail.chem.tamu.edu.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Ozerov
keywords: CC coupling; boranes; density functional calculations; homogeneous catalysis; iridium