Acetic acid, 2-(triphenylphosphoranylidene)-, methyl ester → HCID 14347264, compound

Participants

Reaction Steps

In the manner described in Example 99, 3,3-bis(2-methoxyphenyl)-2-propenal (7.1 g) was reacted with (carbomethoxymethylene) triphenylphosphorane (9.7 g) in carbon tetrachloride (60 ml) and dichloromethane (20 mL) for 3 days at room temperature and then overnight at reflux. The crude ester isolated in the normal manner was crystallized from 2-propanol-hexane to yield 6.5 g of (E)-5,5-bis(2-methoxyphenyl)-2,4-pentadienoic acid methyl ester, mp 100°-102° C. A portion was recrystallized from the same solvents to furnish the analytical sample, mp 101°-102° C. Anal. Calcd for C20H20O4 : C, 74.06: H, 6.21. Found: C, 73.83; H, 6.23.

Provenance & Evidence