2-Methylbenzaldehyde → HCID 86740878, compound

Participants

Reaction Steps

1,2,3,9-tetrahydro-9-oxo-cyclopenta[b][1]benzopyran-7-carboxylic acid, methyl ester, m.p. 156°-158° C. (5.1 g) was reacted with 2-methyl benzaldehyde (3.3 g) in methanol (80 ml) in the presence of sodium methylate (2.28 g) under stirring at room temperature for 20 hours. The precipitate was filtered and washed with methanol and then with water until neutral: crystallization from CH2Cl2 -methanol gave 5.2 g of 3-(2-methyl-benzylidene)-1,2,3,9-tetrahydro-9-oxo-cyclopenta[b][1]benzopyran-7-carboxylic acid, methyl ester, m.p. 203°-205° C.

Provenance & Evidence