Synthesis and steric structure of 3,4-dimethyl-2-(3-methyl-1-phenylbuta-1,2-dienyl)-5-phenyl-1,3,2λ5-oxazaphospholane 2-oxide

Allenic 1,3,2-oxazaphospholanes on the basis of d-pseudoephedrine were synthesized. The steric structure of 3,4-dimethyl-2-(3-methyl-1-phenylbuta-1,2-dienyl)-5-phenyl-1,3,2 lambda(5)-oxazaphospholane 2-oxide was determined by X-ray diffraction.