Boron heterocycles. Part VII. Halogeno-, methyl-, phosphino-, and amino-derivatives of 1,3,2-dioxaborolan and 1,3,2-dithiaborolan ring systems
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 11,p. 1123-1129
- https://doi.org/10.1039/dt9720001123
Abstract
Selected derivatives of the rings [graphic omitted]·CH2·CH2·O·[graphic omitted]– and [graphic omitted]·CH2·CH2·S·[graphic omitted]– are reported. Derivatives of the latter system appear to be more stable thermally and with the exception of [[graphic omitted]·CH2·CH2·S·[graphic omitted]·CH3]2 and [[graphic omitted]·CH2·CH2·S·[graphic omitted]·P·(CH3)2]2 are monomers in solution. Derivatives of [graphic omitted]·CH2·CH2·O·[graphic omitted]– are monomers in solution except for [graphic omitted]·CH2·CH2·O·[graphic omitted]Cl which is associated, having an apparent molecular weight which is concentration dependent. Its boron-11 n.m.r. spectra in solution correlated with molecular-weight data suggest a chain-like species containing ternary and quaternary boron. Tensiometric titrations reveal that P(CH3)3 and P(CH3)2H react with [graphic omitted]·CH2·CH2·O·[graphic omitted]Cl in 1 : 3 rather than 1:1 molar ratios. The products [[graphic omitted]·CH2·CH2·O·[graphic omitted]Cl]3P(CH3)3 and [[graphic omitted]·CH2·CH2·O·[graphic omitted]Cl]3P(CH3)2H are crystalline solids.Keywords
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