Vuthichai ErvithayasupornRapheepraew SodkhomkhumThapong TeerawatananondChuttree PhuratPranee PhinyocheepEkasith SomsookTanakorn OsotchanMahidol UniversityChulalongkorn University2018-10-192018-10-192013-07-01European Journal of Inorganic Chemistry. No.19 (2013), 3292-329610990682143419482-s2.0-84879451548https://repository.li.mahidol.ac.th/handle/20.500.14594/31525Silsesquioxane formation competing with the deprotonation of alcohol solvents in the presence of a strong base to form alkoxides is reported for the first time. Evidently, sodium isopropoxide is formed during the synthesis of the sodium salt of a double-decker octaphenylsilsesquioxane tetrasilanolate in 2-propanol as the solvent, which leads to the formation of unexpected cis- and trans-di[(3-chloropropyl)isopropoxysilyl]-bridged double-decker octaphenylsilsesquioxanes after in situ coupling with 3- chloropropyltrichlorosilane. The desired products were characterized by 1H NMR, 13C NMR, and 29Si NMR spectroscopy; ESI-MS; and single-crystal X-ray diffraction. During the synthesis of the sodium salt of double-decker octaphenylsilsesquioxane tetrasilanolate in 2-propanol, sodium isopropoxide is formed, which leads to the formation of unexpected cis- and trans-di[(3-chloropropyl)isopropoxysilyl]-bridged double-decker octaphenylsilsesquioxanes after in situ coupling with 3- chloropropyltrichlorosilane. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Mahidol UniversityChemistryArticleSCOPUS10.1002/ejic.201300283