Matrix Isolation Study of the Reactions of B2H6 with Pyridine, Pyrrole, and Pyrrolidine: Spectroscopic Characterization of C4H9N*BH3 and C4H8N=BH2

Article abstract of DOI:10.1021/j100146a010

The products of the pyrolytic reaction of B2H6 with pyrrole, pyrrolidine, and pyridine have been isolated in argon matrices at 14 K and characterized by infrared spectroscopy.For the B2H6/C4H9N system, complex formation was observed at temperatures between ambient and 200 deg C and the subsequent H2 elimination product H2B=NC4H8 at pyrolysis temperatures above 50 deg C.The B=N stretching frequency (1486 cm^-1) and local density functional calculations done in upport of the experiments both support substantial double-bond character for the boron-nitrogen bond.The reaction of B2H6 with pyridine led to formation of the H3B*NC5H5 complex only, while copyrolysis of B2H6 with pyrrole led to no reaction even when a pyrolysis temperature of 380 deg C was employed.This result is best understood in terms of the role of thenitrogen lone pair in the aromaticity of the pyrrole ring.