(+/-)-5-<3',4'-(Benzylidendioxy)-3',4'-dihydroxy-2',6',6'-trimethylcyclohex-1'-enyl>-3-methylpenta-2,4-dienal 、 [(2E,4E,6E)-2,7-dimethyl-8-(triphenyl-λ5-phosphanylidene)octa-2,4,6-trienylidene]-triphenyl-λ5-phosphane 在
sodium methylate 作用下,
以
甲醇 为溶剂,
以4%的产率得到(3SR,4RS,3'SR,4'RS)-3,4,3',4'-Bis(benzylidendioxy)-β,β-carotin-3,4,3',4'-tetrol