Reactions of phosphines with electron deficient boranes
作者:Gregory C. Welch、Roberto Prieto、Meghan A. Dureen、Alan J. Lough、Oijsamola A. Labeodan、Thorsten Höltrichter-Rössmann、Douglas W. Stephan
DOI:10.1039/b814486a
日期:——
A series of classical B(C(6)F(5))(3)-phosphine adducts are shown to be reactive molecules. Reaction of (THF)B(C(6)F(5))(3) with phosphines are shown to effect ring-opening of THF affording the zwitterionic phosphonium-borate species of the form R(2)PH(C(4)H(8)O)B(C(6)F(5))(3) and R(3)P(C(4)H(8)O)B(C(6)F(5))(3). Alternatively, treatment of (THF)B(C(6)F(5))(3) with a lithium phosphide (R(2)PLi, R = tBu
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