dispiro[2,3-dihydro-2-methyl-1H-cyclopenta[a]naphthalene-1,2'-thiirane-3',9''-(2''-methoxy-9''H-xanthene)] 在
三苯基膦 作用下,
以
xylene 为溶剂,
生成 cis-2-methoxy-9-(2'-methyl-2',3'-dihydro-1'H-cyclopenta[a]naphthalen-1'-ylidene)-9H-xanthene 、 trans-2-methoxy-9-(2'-methyl-2',3'-dihydro-1'H-cyclopenta[a]naphthalen-1'-ylidene)-9H-xanthene