1979 年 99 巻 2 号 p. 135-140
Acid-catalysed cyclisation of N-substituted mandelohydrazides (II) and X with paraformaldehyde gave hexahydro-1, 2, 4, 5-tetrazine derivatives. Furthermore, the acetyl group on the nitrogen rearranged to alcoholic oxygen during the cyclisation of X so as to give VI.