N. K. Yarosh

Binulcear polyunsaturated organosilicon dendrimers

Binuclear polyunsaturated organosilicon dendrimers of the zero and first generations, whose central silicon atoms are linked by-CH2-Ch2-,-CH=CH-, or-C≡C-bridges, and also containing internal (C≡C) and (CH=CH) groups are prepared. NMR spectra of all the compounds obtained are studied. Their molecular weights were calculated and evaluated experimentally. Key parameters of new dendrimers are presented.

Mononuclear polyunsaturated organosilicon dendrimers simultaneously containing (CH=CH) and (C≡C) fragments

Mononuclear organosilicon tri- and tetradendrons of the zero, first, and second generations, containing double bonds in the internal near-core molecular sphere, internal C≡C groups, and terminal Me, CH=CHSiMe3, and C≡CH substituents at the central silicon atom were synthesized. Their IR and 1H, 13C, 29Si NMR spectra were studied. The molecular weights of the dendrimers obtained were evaluated, and key parameters of these compounds are presented.

New polyunsaturated silahydrocarbons

Abstract12-Membered highly unsaturated macrocyclic silahydrocarbon containing exocyclic methyl and benzyl groups is synthesized by the reaction of benzylmethyldi(bromomagnesiumethynyl)silane with dimethyldichlorosilane. Hydrosilylation of benzyl(triethynyl)silane with trichlorosilane with subsequent reaction of the formed adduct with trimethylsilylmagnesium bromide leads to the spherical dendrimer (NC = 3) containing the benzyl group at the central Si atom, -CH=CH- groups in the inner sphere and numerous triple bonds on periphery. NMR spectra of the obtained compounds were studied.

C- and Si-substituted benzyl(ethynyl)silanes

Hitherto unknown mono-, di, and triethynyl C- and Si-substituted benzylsilanes were synthesized by the reaction of benzylmagnesium halides with dialkyl(ethynyl)fluorosilanes and of benzyldichloro(hydrocarbyl) silane and benzyltrichlorosilane with ethynylmagnesium bromide. The IR and NMR spectra of all new compounds were studied.

Highly Unsaturated Macrocyclic Silahydrocarbons Containing Exocyclic Phenyl Groups

A series of 12- and 18-membered macrocycloethynes and macrocyclosilethenesilethynes, containing peripheral methyl and phenyl groups was prepared by organomagnesium sysnthesis under conditions of high dilution. One of these compounds contains an endocyclic 1,4-phenylene bridge.