3h 3 95 s 3h 4 21 d 2h 5 18 d 1h 5 72 d 1h 6 95 s 1h 7 2 bs 2h 9 45 d 1h the same procedure as in example 10 was repeated except that acetonitrile in the same amount was used in place of dichloromethane then the resulting reaction mixture was treated in the same manner as described in example 3 and adjusted to a ph of about 3 1 to precipitate crystals the resulting crystals were filtered out and dried to give 17 53 g 86 1 of the title compound the same procedure as in example 10 was repeated to give a reaction mixture into a 3 neck flask 13 62 g of 7 amino 3 2 5 dihydro 2 methyl 6 hydroxy 5 oxo as triazin 3yl thiomethyl 3 cephem 4 carboxylic acid 200 0 ml of dichloromethane and 14 84 g of triethylamine were placed to the mixture 16 58 g of dichlorodimethylsilane was added dropwise at 15 u00b0 c the resulting mixture was stirred for hour to which the reaction mixture obtained from step a was then added and the resulting mixture was stirred for 1 hour at 10 u00b0 c after completion of the reaction 17 0 g of sodium bicarbonate and 210 0 ml.