Monomeric di-t-butylmethyleneaminoboranes
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 3,p. 370-373
- https://doi.org/10.1039/dt9720000370
Abstract
The following new di-t-butylmethyleneaminoboranes have been prepared (the reagents in parentheses): But 2C:NBPh2(from Ph2BCl + But 2C:NLi); But 2C:NBCl2(BCl3+ But 2C:NLi); and But 2C:NBBun 2(But 2C:NBCl2+ 2BunLi or Bun 2BCl + But 2C:NLi). These di-t-butylmethyleneaminoboranes are monomeric in benzene solution, with i.r. azomethine stretching frequencies in the range 1812–1839 cm–1. Their 11B n.m.r. show resonances at 32 ± 4 p.p.m. relative to BF3,OEt2 as is consistent with boron being in a three-co-ordinate environment. Their 1H n.m.r. spectra have only a singlet absorption attributable to the t-butyl protons, even at –60°, interpreted as indicating that they probably contain linear CN[graphic omitted]B groups. Features of their mass spectra, which confirm their monomeric state in the gas phase, are briefly discussed.Keywords
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