Theoretical, Physical and Structural Studies on Organoboron Compounds

5 Theoretical, Physical and Structural Studies on Organoboron Compounds 

A variable temperature n.m.r. study on alkoxy and alkyl-thio-piperidinophenylboranes indicates that B-0 ir bonding is some 12 kJ mol greater than B-S ir bonding. A multinuclear n.m.r, study of methylaminodiphenylborane has been reported and the spectrum interpreted differently to earlier studies on similar compounds.8 jon cyclotron resonance spectroscopy has been used in a comparative study of the behaviour of alkoxide and alkoxide--alkanol ions with alkyl and alkoxyboranes in the gas phase. 

He(l) photoelectron and n.m.r. spectroscopic studies on BR2X (R=Pr, Bu ) indicate that these systems correspond well to the R = Me and Et cases except when X = NR2 which deviate from a planar C2BNC2 conformation. X.-ray structures of five dlborylamines and a borylsllylamine have been determined and the observed conformations and bonding parameters discussed in terms of steric effects,The preferred conformations of a series of synmetrically and unsymmetrically substituted dlborylamines have been revealed by n.m.r. to be a function of the substituents.  

The preparation and structure of (tert-butylimino)(tris(trimethyl-silyl)silyl)borane have been reported and whilst the molecule does not contain a boron-carbon bond it is of relevance to the subject of this report. 

1 Organometalllc OongioundB of Boron, K. Smith, Chapman Hall Ltd., London, 

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