o 4 calc 39 d c 46 39 h 2 75 found c 45 95 h 2 66 this compound was prepared from 2 butyl benzofuran 3 yl 3 5 dibromo 4 hydroxy phenyl methanone and tert butyl bromoacetate in substantially the same manner as described in example 2 and was obtained as an off white solid mp 92 94 u00b0 c ms m e 508 m analysis for c 21 h 18 br 2 o 5 calc 39 d c 49 44 h 3 56 found c 47 24 h 3 59 bromine 3 49 ml was added dropwise into a mixture of 2 n butyl 3 hydroxybenzoyl benzo b furan 10 0 g 34 0 mmol acetic acid 50 ml and h 2 o 10 ml the mixture was stirred for 12 hours and poured into water the precipitated solid was filtered and dried to give a white solid 11 2 g 71 yield mp 95 97 ms m e 450m analysis for c 19 h 16 br 2 o 3 u00d7 0 8 h 2 o calc 39 d c 48 89 h 3 80 found c 48 83 h 3 37 this compound was prepared from 2 6 dibromo 4 2 ethyl benzofuran 3 yl methyl phenol and tert butyl bromoacetate in substantially the same manner as.