2,7-Bis-methoxycarbonyl-2,7-di-prop-2-ynyl-oct-4-ynedioic acid dimethyl ester 在
cyclopentadienylruthenium(II) trisacetonitrile hexafluorophosphate
溶剂黄146 作用下,
以49%的产率得到dimethyl (Z)-3-(3,3-bis(methoxycarbonyl)pentylidene)cyclopentane-1,1-dicarboxylate