Method for producing organo-oligo silsesquioxanes

A method for producing organooligosilsesquioxanes of the formula (I)

• [RSiO3/2]z (I)
• where
• R represents moieties of general formula (II)
• —O—SiR12Y (II),
• by reacting of silicates of formula (III)
• (W4NOSiO3/2)z (III),
• with not more than 1.3×50×z mol of disiloxane compounds of general formula (IV),
• R12YSi—O—SiR12Y (IV),
• per 100 mol of the silicates of the formula (III),
• wherein
• R1 independently are divalent C1- to C6-hydrocarbon or C1- to C6-alkoxy moieties,
• Y independently are hydrogen or a halogenated or nonhalogenated C1- to C10-hydrocarbon moiety,
• W is a C1- to C4-alkyl moiety, and
• z is 6, 8 or 10,
• reacting taking place in the presence of a precipitant which is liquid at at 25° C. and 0.1 Mpa and in which at a reaction temperature of 0° C. to 60° C., at most 1 g of organooligosilsesquioxanes of formula (I) are soluble in 100 ml of precipitant, wherein the resultant organooligosilsesquioxane of formula (I) crystallizes out in the reaction medium at a purity of 95-100%, measured via 1H NMR, during the reaction or directly after the reaction.