Abstract
Because the extensive dπ-pπ interaction between silicon and oxygen, the monomeric five-membered ring products, (methyl-1,2-phenylenedioxy)diorganosilanes, rather than dimers were synthesized from methylcatechols and dichlorodiorganosilanes. In addition to the five-membered ring products, the more stable seven-membered-ring cyclodisiloxanes were found. From the X-ray diffraction data of these sevenmembered-ring disiloxanes, the latter were found to be free of ring strain and to have better conjugation than the five-membered ring species in the Si-O-C(Ar) moiety of the molecules.
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