86314-40-1Relevant academic research and scientific papers
Synthesis and Structure of Spiro5-benzoxaza(diaza)phosphole-2,5'-λ5-dibenzophospholes>
Wax, Gerhard,Haller, Richard,Stegmann, Hartmut B.,Scheffler, Klaus,Butters, Thomas,Winter, Werner
, p. 1914 - 1922 (2007/10/02)
o-Aminophenols or o-phenylenediamines react with 5,5-dibromodibenzophospholes to give spirophosphoranes 1 - 6.The 31P, 13C, and 1H NMR spectra are independent of temperature, therefore, no evidence of a permutation process was detectable.As an example the structure of the heterocyclic compound 4,6-di-tert-butyl-1-ethyl-1,3-dihydro-2-phenylspiro5-benzodiazaphosphole-2,5'-λ5-dibenzophosphole> (5) was determined by X-ray crystallography.The compound crystallizes in the space group P212121 with Z = 4.The five-membered rings are attached to the phosphorus in an equatorial-axial manner.The phenyl and the NH group occupy equatorial positions, the N-C2H5 substituent is axially located.According to the geometry determined an assignment of the NMR coupling constants was done.Spiro compounds 1 - 6 show a very similar geometry.
