Aryl fluorides from the reaction of boron trifluoride with aryl-lead(IV) triacetates, which may be generated in situ from aryltrimethylsilanes, triarylboroxines, and arenes
作者:Giuseppe V. De Meio、John T. Pinhey
DOI:10.1039/c39900001065
日期:——
Aryl-lead(IV) triacetates react at room temperature with BF3·Et2O to give the corresponding arylfluoride in moderate to good yields; triarylboroxines, electron-rich aryltrimethylsilanes, and some arenes, which yield aryl–lead(IV) triacetates in acid catalysed reactions with lead tetra-acetate, may be converted directly into arylfluorides when stirred with lead tetra-acetate in BF3·Et2O.
Reversible Formation of Organyl(oxo)boranes (RBO) (R = C<sub>6</sub>H<sub>5</sub> or CH<sub>3</sub>) from Boroxins ((RBO)<sub>3</sub>): A Matrix Isolation Study
作者:Holger F. Bettinger
DOI:10.1021/om061057i
日期:2007.12.1
Flash vacuum pyrolysis of triphenyl- and trimethylboroxin and subsequent trapping of the gas phase products in a large excess of argon at T < 20 K allows matrix isolation and characterization by IR spectroscopy of phenyl(oxo)borane and methyl(oxo)borane. The nature of the matrix isolated species, monomeric CH3BO, 1: 1 dimer complex of CH3BO, (CH3BO)(2), and (CH3BO)(3), depends strongly on the trapping temperature and matrix host gas (Ar vs Xe) with the boroxin dominating at 30 K (Ar) or 55 K (Xe). An ab initio investigation (second-order Moller-Plesset perturbation theory) of the potential energy surface for trimerization of CH3BO is in agreement with the experimental observations.