Synthesis and Structures of Dimesityldiboranes(4)

✍ Scribed by Herbert Hommer; Heinrich Nöth; Jörg Knizek; Werner Ponikwar; Holger Schwenk-Kircher

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 385 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199810)1998:10<1519::aid-ejic1519>3.0.co;2-#

✦ Synopsis

4. / B,BЈ-Di-tert-butyloxy-B,BЈdimesityldiborane(4) / B,BЈ-Dimesityl-B, BЈ-di(organylthio)diborane(4) / NMR spectroscopy / X-ray structures An efficient route to B, BЈ-dihalo-B,BЈ-dimesityldiboranes(4) 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 is reported, as well as the conversion of these and of B,BЈdimesityl-B,BЈ-dimethoxydiborane(4) into other B,BЈ-compounds. This is also reflected in short B-C bonds. Moreover, the two mes(Y)B units also approach orthogonality 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 in these diborane(4) compounds, and thus enforce this as a typical structural feature of diborane( 4) derivatives. For this the expected manner. Hindered rotation about the B-N bond is observed for X = pyrrolyl, while in solution there is free reason, the planar C(N)B-B(N)C unit of B,BЈdi(benzylamino)-B,BЈ-dimesityldiborane( 4) is regarded as rotation about the B-C bond. However, X-ray structural results reveal that the mesityl group is almost orthogonal to exceptional for aminodiboranes(4). the B(B)CY plane in the solid state. The shortest B-B bond is