反应详情

2-Butylfluorene (6.1 g.) was acetylated exactly as described for 2-ethylfluorene in the preceding Example 21, using acetic anhydride (3.08 g.) and aluminium chloride (8.66 g.) in dichloroethane. The product was recrystallised from light petroleum to give 2-acetyl-7-butylfluorene, m.p. 102° 104.5°. This product (1.98 g.) was oxidised with sodium hypobromite (from 7.23 g. of bromine and 4.52 g. sodium hydroxide in 160 ml. water) exactly as described for 2-acetyl-7-ethylfluorene in the preceding Example. The 7-butylfluorenone-2-carboxylic acid thus isolated had m.p. > 300° and was homogeneous by thin layer chromatography.

1. customThe product was recrystallised from light petroleum