Steric Effects in Heteroboranes. IV. 1-Ph-2-Br-1,2-closo-C2B10H10

The structure of 2-bromo-1-phenyl-1,2-dicarba-closo-dodecaborane(12), C 8 H 15 B 10 Br, has been determined crystallographically. The phenyl substituent is oriented orthogonally to the effective molecular mirror plane and there is tentative evidence for a weak intramolecular Ph...Br interaction. C(1)−C(2) is 1.692 (8) A