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Organosilicon chemistry. Part XIX. Reactions of 1,1,3,3-tetramethyl- and 1,3-dimethyl-1,3-diphenyl-1,3-disilacyclobutane with chlorosilanes in the presence of hexachlorophatinic(IV) acid, tin(IV) chloride, trimethylsilanol, and triphenylsilanol

1975; Royal Society of Chemistry; Issue: 18 Linguagem: Inglês

10.1039/dt9750001832

2050-5671

Anthony M. Devine, R. N. Haszeldine, Anthony E. Tipping,

Inorganic and Organometallic Chemistry

1,1,3,3-Tetramethyl-1,3-disilacyclobutane, (I), reacts with trichlorosilane or dichloro(methyl)silane in the presence of hexachloroplatinic(IV) acid to give the chlorine-exchange adducts, Me2SiCl·CH2·SiMe2·CH2·SiHCl2(80%) or Me2SiCl·CH2·SiMe2·CH2·SiMeHCl (61%); in the latter reaction the hydrogen-exchange adduct, Me2SiH·CH2·SiMe2·CH2·SiMeCl2(5%). is also formed. A comparable reaction of 1.3-dimethyl-1.3-diphenyl-1,3-disilacyclobutane, (II), with trichlorosilane gives mainly polymeric material together with the chlorine-exchange adduct (10%). Both silacyclobutanes react with tin(IV) chloride in the absence of catalyst or with trimethylsilanol to afford ring-opened 1 :1 adducts in high yield. Compound (I) also reacts with triphenylsilanol to afford hexaphenyldisiloxane and 1,1,3,3-tetramethyl-1,3-bis(trimethylsilylmethyl)disiloxane (87%); (II) does not react under comparable conditions.