the following non limiting preparations and examples in 15 ml of methylene chloride there was dissolved 1 27 g of resorcinol di trimethylsilylether at room temperature there was added a solution of 7 5 g of maltose octaacetate and 10 ml of boron trifluoride etherate in 40 ml of methylene chloride the solution was stirred for 18 hours at room temperature and then neutralized with aqueous sodium bicarbonate the organic layer was separated dried over anhydrous sodium sulfate and evaporated leaving a gum the gum was allowed to remain in anhydrous ether wherein it crystallized to yield 2 48 g of the desired intermediate as a white powder m p 123 u00b0 125 u00b0 c in 200 ml of methanol saturated at 0 u00b0 c with ammonia there was dissolved 1 25 g of the end product of example 1 and the solution was allowed to gradually come to room temperature over 18 hours the solvent and excess ammonia were removed in vacuo and the resulting gum solidified when absolute ethanol was added the solid was collected by filtration and dried to give 345 mg of the desired intermediate as a white solid u03b1 d 26 37 u00b0 h 2 o in 5 ml of dimethylacetamide there was dissolved 200 mg of 1 3 bis 4 o u03b1 d.