extract was washed with water and saturated sodium chloride aqueous solution successively dried over anhydrous magnesium sulfate and concentrated to dryness under reduced pressure to obtain 2 68 g of 2 bromo 6 11 dihydrodibenzo b e thiepin 11 carboxylic acid ir kbr tablet cm 1 3450 3020 2650 1715 1700 1465 1275 1210 nmr u03b4 ppm cdcl 3 3 70 and 4 64 q 2h ab type j 14 8hz 4 77 s 1h 6 99 d 1h j 4 8hz 7 05 7 43 m 6h the similar procedures as in example 39 were repeated except using 13 3 g of 2 bromo 5 11 dihydro 5 methyl 11h dibenz b e azepin 6 11 dione in place of 6 11 dihydro 2 methyldibenz b e oxepin 11 one to obtain 5 08 g of 2 bromo 5 11 dihydro 5 methyl 6 oxo 11h dibenz b e azepin 11 carboxylic acid ir kbr tablet cm 1 2895 1724 1599 1562 1486 1378 1194 nmr u03b4 ppm cdcl 3 3 46 s 3h 4 76 s 1h 7 11 7 85 m 7h the similar procedures as in example 54 were repeated except using 5 50 g of 10 11 dihydro 5h dibenzo a d cyclohepten 5 carbonitrile in place of 9 bromo 6 11 dihydrodibenz b e oxepin 11 carbonitrile to obtain 2.