In a 1 l four-neck flask with stirrer, reflux condenser and dropping funnel, 31.7 g of salicyl alcohol (0.25 mol) and 66.7 g (0.52 mol) of dried N-ethyldiisopropylamine were suspended under argon in 100 ml of anhydrous toluene at 22° C. Octadecylmethyldichlorosilane (95%) was melted and dissolved in 100 ml of dry toluene. This solution was added dropwise at 23 to 27° C. over 55 minutes, in the course of which an exothermic reaction was observed. By cooling with an ice bath, the reaction temperature was kept at not more than 27° C. After the addition had ended, the temperature was raised to 40° C., in the course of which exothermicity (without heating to 45° C.) was again observed. The reaction vessel was then cooled to 40° C. with cold water, and the mixture was stirred at this temperature for one hour and then cooled to RT. The suspension was left to stand at RT overnight. The precipitate (hydrochloride) was filtered off with suction under N2 through a P40 glass frit, and the filtrate was concentrated by rotary evaporation at 120° C./5 mbar. Yield 80.9 g (77% of theory)
