Communication 10. New method of synthesizing cyclic esters of dialkylsilanediols and of orthosilicic acid

1. A new method was developed for the synthesis of 2,2-dialkyl-1,3-dioxa-2-silacycloalkanes by reaction between diacetoxydialkylsilanes and β-, γ-, δ -, and ∋-glycols. By this method we synthesized four such compounds having 6-, 7-, 8-, and 9-membered rings; three of them were prepared for the first time. 2. Reaction of diacetoxydialkylsilanes with ethylene glycol and with 1,2-propanediol results in the formation of 2,2,7,7-tetraalkyl-l,3,6,8-tetroxa- 2,7-disilacyclodecanes and dimethyl derivatives of these, respectively. 3. Reaction between tetraacetoxysilane and 1,3-butanediol gave 2,8-dimethyl-l,5,7,11-tetroxa-6-silaspiro-[5.5]undecane.