Practical synthesis of 9-methylthio-7,8-nido-carborane [9-MeS-7,8-C2B9H11]-. Some evidences of BH···X hydride-halogen bonds in 9- XCH2(Me)S-7,8-C2B9H11 (X = Cl, Br, I)статьяЭлектронная публикация
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Дата последнего поиска статьи во внешних источниках: 9 ноября 2017 г.
Аннотация:Convenient method of synthesis of 9-methylthio-7,8-nido-carborane [9-MeS-7,8-C2B9H11]- based on demethylation of the dimethylsulfonium derivative 9-Me2S-7,8-C2B9H11 with sodium amide in toluene was developed. A series of alkylmethylsulfonium derivatives of nido-carborane containing heteroatoms with lone electron pairs at α-position of alkyl were prepared 9-XCH2(Me)S-7,8-C2B9H11 (X = Cl, Br, I, OMe) by alkylation of [9-MeS-7,8-C2B9H11]-. The 11B NMR spectra of these compounds demonstrate splitting signals corresponding to B(5) and B(10) atoms that can be explained by the weak intramolecular B-H···X interactions in the diastereomers containing alkyl groups directed downwards and upwards relatively to the nido-carborane pentagonal face. The existence of such interactions was supported by quantum chemical calculations.