Tuning Lewis acidity using the reactivity of “frustrated Lewis pairs”: facile formation of phosphine-boranes and cationic phosphonium-boranes
作者:Gregory C. Welch、Lourdes Cabrera、Preston A. Chase、Emily Hollink、Jason D. Masuda、Pingrong Wei、Douglas W. Stephan
DOI:10.1039/b704417h
日期:——
phosphonium-boranes [R(3)P(C(6)F(4))B(C(6)F(5))(2)](+) and [R(2)PH(C(6)F(4))B(C(6)F(5))(2)](+) or into the neutral phosphino-boranes R(2)P(C(6)F(4))B(C(6)F(5))(2). This new reactivity provides a modular route to a family of boranes in which the steric features about the Lewisacidic center remains constant and yet the variation in substitution provides a facile avenue for the tuning of the Lewis acidity. Employing