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1992organo-silicon compounds, nonmetal heterocycles organo-silicon compounds, nonmetal heterocycles S 0067 05 -208 2,3-Disilaoxetanes from Tetramesityldisilene: Synthesis and Photolysis.-Title compounds of type (III) are obtained from the disilene (I) and various carbonyl compounds, e.g. (IIa)-(IId) and even methyl furoate ( IIe). Other esters do not react with (I). Photolysis products of (IIIa) and (IIIb) obtained in the presence or absence of ethanol as a trapping agent arise from photolytic retro-(2 + 2) cleavage of the oxetane ring. -(FANTA, A. D.; DEYOUNG, D. J.; BELZNER, J.; WEST, R.; Organometallics 10 (1991) 10, 3466-3470; Dep. Chem., Univ. Wis., Madison, WI 53706, USA; EN)