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- W1569778981 abstract "The intramolecular disproportionation of α,ω-bis(dimethylstibino)alkanes provides a new route to small-ring stibacycloalkanes. 1-Methylstibacyclopentane and 1-methylstibacyclohexane have been prepared in good yield via thermolysis 1,4-bis(dimethylstibino)butane and 1,5-bis(dimethylstibino)pentane. Attempts to prepare 1,-methylstibacyclobutane and 1-methylstibacycloheptane via thermolysis of 1,3-bis(dimethylstibino)propane and 1,6-bis(dimethylstibino)hexane instead resulted in intermolecular disproportionation leading to the formation of polymeric material. The α,ω-bis(dimethylstibino)alkanes used as starting materials were prepared by the reaction of dimethylstibylsodium with α,ω-dichloro- or α,ω-dibromo-alkanes in liquid ammonia. Upon reaction of dimethylstibylsodium with 1,4-dibromobutane and 1,5-dibromopentane in a 2/1 ratio, 1-methylstibacyclopentane and 1-methylstibacyclohexane were formed probably via intramolecular quaternization of intermediate α-methylstibino-ω-bromoalkanes. All antimony(III) compounds prepared have been converted into the corre- sponding dichloroantimony(V) derivatives. Quarternization with methyl iodide leads to the formation of 1,1-dimethylstibacyclopentane and 1,1-dimethylstiba- cyclohexane iodides. IR spectra of the stibacycloalkanes show a characteristic absorption in the region 460–470 cm−1. Moreover, the stibacyclohexane derivatives show two characteristic bands in the region 900–920 and 980–1010 cm−1, which are not observed in the spectra of the stibacyclopentanes." @default.
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- W1569778981 date "1976-04-01" @default.
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- W1569778981 title "Investigations on organoantimony compounds" @default.
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- W1569778981 doi "https://doi.org/10.1016/s0022-328x(00)89689-8" @default.
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