Reversible Borylene Formation from Ring Opening of Pinacolborane and Other Intermediates Generated from Five-Coordinate Tris-Boryl Complexes: Implications for Catalytic C-H Borylation.

ABSTRACT: Catalytic C-H borylation using the five-coordinate tris-boryl complex (dippe)Ir(Bpin)₃ (5a, dippe = 1,2-bis(diisopropylphosphino)ethane) has been examined using ³¹P{¹H} and ¹H NMR spectroscopy. Compound 5a was shown to react rapidly and reversibly with HBpin to generate a six-coordinate borylene complex, (dippe)Ir(H)-(Bpin)₂(BOCMe₂CMe₂OBpin) (6), whose structure was confirmed by X-ray crystallography. Under catalytic conditions, the H₂ generated from C-H borylation converted compound 6 to a series of intermediates. The first is tentatively assigned from ³¹P{¹H} and ¹H NMR spectra as (dippe)Ir(H₂B₃pin₃) (7

SUBMITTER: Ghaffari B 

PROVIDER: S-EPMC5297890 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature