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Examines known boron hydrides, their structure and bonding, their relative thermal stabilities, the preparation of diborane, higher boranes from the pyrolysis of diborane, and possible identities of the non-volatile boron hydrides.

The ratios of ortho, meta and para isomers produced in the aluminum bromide-catalyzed bromination of fluorobenzerie, chlorobenzene and bromobenzene, and the relative rates of bromination of these halobenzenes with respect t o benzene have been determined in carbon disulfide. Photochemical catalysis gives markedly different results from which it is concluded that the aluminum bromide-catalyzed bromination does not take place by a homolytic mechanism. All analyses were made by infrared spectrophotometry.