2 o and stirred for one hour at 45 u00b0 c after this time a solution of 95 6 g n butyl glycidyl ether and 200 ml water free thf was slowly dripped in with the temperature not exceeding 55 u00b0 c after the addition was complete the mixture was stirred for 68 hours at room temperature 5 3 g soda in 30 ml water was added and workup continued as usual ______________________________________yield 258 6 gosmotic molecular weight 1 920elemental analysis 66 11 c 11 19 h 22 82 okinematic viscosity at 40 u00b0 c 480 2 mm sup 2 s100 u00b0 c 82 3 mm sup 2 sviscosity index 256______________________________________ 1 8 ml boron trifluoride etherate was added to a solution of 10 g decanol in 25 ml water free thf the mixture was stirred for one hour at 45 u00b0 c and then a mixture of 83 0 g n decyl glycidyl ether and 125 ml water free thf was slowly dripped in so that the temperature does not exceed 55 u00b0 c after the addition was complete the mixture was allowed to react for another 22 hours at room temperature for workup the reaction mixture was mixed with a solution of 3 0 g soda in 50 ml water and further processing took place as in example 1 ______________________________________yield 145 gosmotic molecular weight 1 650elemental.