N-苯基马来酰亚胺 、
2,5-diphenyl-1,3-dithiolylium-4-olate 以
xylene 为溶剂,
生成 2,4,7-triphenyl-(3a
c,7a
c)-tetrahydro-4
r,7
c-episulfano-thiopyrano[3,4-
c]pyrrole-1,3,6-trione 、
2,4,7-triphenyl-(3at,7at)-tetrahydro-4r,7c-episulfano-thiopyrano[3,4-c]pyrrole-1,3,6-trione