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Paper | Regular issue | Vol 36, No. 3, 1993, pp.553-563
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6225
Wittig-Horner Reaction of Dimethyl Phthalide-3-phosphonates with Aldehydes: Synthesis of 3-Ylidenephthalides and Characterization of Their E- and Z-Isomers

Mitsuaki Watanabe,* Saori Ijichi, Hitoshi Morimoto, Kayoko Nogami, and Sunao Furukawa

*Center for Instrumental Analysis, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan


Wittig-Horner reaction dimethyl phthalide-3-phosphonates with aldehydes in the presenece of lithium bis(trimethylsilyl)amide was investigated. Using their NOE experiments, both the E- and Z-isomers of 3-ylidenephthalides were clearly characterized.