HCID 20285742, compound → HCID 131710956, compound

Participants

Reaction Steps

A suspension of 10.83 g. (22.6 mmol) of (2,4-dichloro-5-methyl-3-thenyl)triphenyl phosphonium chloride and 5.15 g. (24.8 mmol) of ethyl 7-formyl-3-methyl-2,4,6-octatrienoate in 350 ml. of butylene oxide was heated to 70° C. for 4.5 hrs. The resulting clear solution was cooled, poured into 500 ml. of a methanol/water mixture (6:4) and extracted with hexane. The combined hexane extracts were washed with methanol/water (6:4), dried and evaporated. The resulting crude material was purified by chromatography (silica gel, hexane/ethyl acetate=4:1) to yield after recrystallization from hexane, all trans-3,7-dimethyl-9-(2,4-dichloro-5-methyl-3-thienyl)-2,4,6,8-nonatetraenoic acid ethyl ester, m.p. 99°-100° C.

Provenance & Evidence