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Research On Problems Of Restricted Rotation Relevant To Inorganic Polymers

Report Number: ASD TDR 62-942 Part 2
Author(s): Michael F. Lappert
Corporate Author: Manchester University
Laboratory: Air Force Materials Laboratory
Date of Publication: 1963-11
Pages: 48
Contract: AF 61()52)-441
Project: 7340
Task: 734004
AD Number: AD0426854

Abstract:
Evidence from nuclear magnetic resonance (N.M.R.) studies for pi-bonding between B and N in the borazens is presented. That a similar situation might exist between P (III) and N in open chain compounds was indicated by IR studies. The energy barrier to rotation about the BN bond in dimeth ylaminophenylchloroborane was calculated, from observations upon three different parameters characterizing the shape of the N.M.R. signal, as 14 = 0.8 kcal/mole. The barrier in the cor responding bromo-compound was evaluated by analogous methods. The N.M.R. spectrum of the recently reported compound, 1,3-di-t-butyl-2,4 di-t-butylamino-1,3-diaza-2,4-boretane clearly demonstrated that the compound has more than one steric configuration presumably due to exocyclic pi-bonding.

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