Cycloaddition of nitrilimine generated in situ from -phenylbenzene carbohydrazonoyl chloride in the presence of triethylamine affords (3a,5,7a)-5-isopropenyl-7a-methyl-1,3-diphenyl-1,3a,4,5,6,7a-hexahydro-7-indazol-7-one as the main reaction product. The structure of the resulting compound was determined by spectral methods.
N.R. Yamaletdinova (Wed,) studied this question.