Synthesis and Structure of the First Terminal Borylene Complexes

Holger Braunschweig; Carsten Kollann; Ulli Englert

doi:10.1002/(SICI)1521-3773(19981204)37:22<3179::AID-ANIE3179>3.0.CO;2-Z

Synthesis and Structure of the First Terminal Borylene Complexes

Angew Chem Int Ed Engl. 1998 Dec 4;37(22):3179-3180. doi: 10.1002/(SICI)1521-3773(19981204)37:22<3179::AID-ANIE3179>3.0.CO;2-Z.

Authors

Holger Braunschweig¹, Carsten Kollann¹, Ulli Englert¹

Affiliation

¹ Institut für Anorganische Chemie der Technischen Hochschule, Templergraben 55, D-52056 Aachen (Germany), Fax: (+49) 241-888-8288.

Abstract

A nearly linear arrangement is observed for the three atoms in the central W-B-N unit of the tungsten complex [(CO)₅ WBN(SiMe₃ )₂ ] (1) in the crystal (W-B-N 177.9°; see picture). This compound along with its Cr analogue represent the first examples of terminal borylene complexes with a two-coordinate metal-bound boron atom. The geometries of the axial and equatorial CO groups in 1 are similar, and thus indicate that there is no trans effect of the borylene ligand.

Keywords: Boron; Chromium; Transition metal complexes; Tungsten.