The Parent Hexacarbaborane arachno-C B H and a Methylated Pentacarbaborane arachno-CH C B H : Domains of Incipient Hydrocarbon Behavior within Borane Clusters.

Increasingly pronounced hydrocarbon character is exhibited by C H B , the first unsubstituted hexacarbaborane, and CH C B H , the first cluster pentacarbaborane. These compounds shed light on the structural dichotomy between open hydrocarbon skeletons and polyhedral borane frameworks for high-carbon carboranes.