重氮甲烷 、
(+/-)-(2Z,4E)-5-(1',2'-epoxy-2',6',6'-trimethylcyclohexyl)-3-methyl-2,4-pentadienoic acid 在
sodium hydroxide 作用下,
生成
5-<1.2-Epoxy-2.6.6-trimethyl-cyclohexyl>-3-methyl-penta-2c,4t-diensaeure-methylester 、 (+/-)-(2Z,4E)-methyl 1',2'-dihydroxy-1',2'-dihydro-β-ionylideneacetate 、 (+/-)-(2Z,4E)-methyl 5'-hydroxy-1',2'-epoxy-1',2'-dihydro-β-ionylideneacetate 、
(+/-)-xanthoxin acid methyl ester