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Synthesis and Structures of Dimesityldiboranes(4)
Author(s) -
Hommer Herbert,
Nöth Heinrich,
Knizek Jörg,
Ponikwar Werner,
SchwenkKircher Holger
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199810)1998:10<1519::aid-ejic1519>3.0.co;2-#
Subject(s) - chemistry , nanotechnology , combinatorial chemistry , materials science
An efficient route to B , B′ ‐dihalo‐ B , B′ ‐dimesityldiboranes(4) is reported, as well as the conversion of these and of B , B′ ‐dimesityl‐ B , B′ ‐dimethoxydiborane(4) into other B , B′ ‐dimesityldiboranes B 2 mes 2 X 2 (X = OR, SR, NR 2 , NHR). The substituents X influence the shielding of the 11 B nucleus in the expected manner. Hindered rotation about the B–N bond is observed for X = pyrrolyl, while in solution there is free rotation about the B–C bond. However, X‐ray structural results reveal that the mesityl group is almost orthogonal to the B(B)CY plane in the solid state. The shortest B–B bond is observed in mes 2 B 2 I 2 , indicating that the iodide is the strongest Lewis acid in the reported series of mes 2 B 2 Y 2 compounds. This is also reflected in short B–C bonds. Moreover, the two mes(Y)B units also approach orthogonality in these diborane(4) compounds, and thus enforce this as a typical structural feature of diborane(4) derivatives. For this reason, the planar C(N)B–B(N)C unit of B , B′ ‐di(benzylamino)‐ B , B′ ‐dimesityldiborane(4) is regarded as exceptional for aminodiboranes(4).