a 250 ml 3 necked round bottom flask was equipped with magnetic stirrer thermometer addition funnel and ice bath a stream of dry nitrogen was introduced and the flask charged with a solution of 10 g 17 4 mmol of c 7 f 15 ch 2 o ch 2 3 sicl 3 1 in 75 ml of diethylether the silane was prepared from c 7 f 15 ch 2 och 2 ch u2550 ch 2 and trichlorosilane as described in u s pat no 3 012 006 ex 1 the allyl compound was prepared by reaction of allyl bromide with c 7 f 15 ch 2 oh in the presence of koh using dimethylsulfoxide dmso as solvent stirring was initiated and a solution of 6 88 g 57 3 mmol diethylene glycol monomethyl ether aldrich distilled from sodium and 5 8 g 57 4 mmol triethylamine in 50 ml of diethyl ether was introduced dropwise through the addition funnel an exotherm to 25 u00b0 c occurred the ice bath was removed and the solution was allowed to stir overnight the reacted mixture was filtered to remove amine salt and the filtrate was distilled to remove ether leaving 14 7 g clear virtually colorless liquid a 2 0 g portion of this liquid was distilled in a kugelrohr apparatus yielding 1 68 g of product fraction having a boiling point of 165 u00b0 175 u00b0 c 0 04 torr the 1 h nmr spectrum of this fraction was consistent with the above stated product it was designated surfactant 1 c 7 f 15 ch 2 o ch 2 3 si o ch 2 ch 2 o 3 ch 3.