N. D. Kolosova

THE SYNTHESIS OF TRISILGERMANIUM AND TRISILTIN CHLORIDES

At present an intensive research is carried out of organometallic compounds containing the trisil group [(MeaSi)3C--, Tsi]. Of the trisil derivatives of the group IVB elements only the compounds of the type RnTsiSiX3-n (I) have been briefly described, whereby interesting rearrangements have been observed for (I) (n = i, 2) [1-3]. The compounds Me3MTsi (M = Ge, Sn) [4, 5] are also known; however, data on their reactivity are not available.

Reactions of cyclopentadienyl compounds of tin with organic acids

1. The strength of the C5H5-Sn bond with respect to acidolysis by carboxylic acid increases along the series R3SnC5H5 < R2Sn(C5H5)2 < RSn(C5H5)3 ≤ (C5H5)4Sn (R = Alk) in agreement with the decrease in the effective negative charge in the ring and the degree of σ-π conjugation between the C-Sn bond and the diene system of the cyclopentadienyl ring. 2. Dicyclopentadienyltin diacylates undergo reactions involving the exchange of pentadienyl groups and acyl residues and the formation of a mixture of mono-, di-, and tricyclopentadienyltin acylates. 3. The acidolysis of tetracyclopentadienyltin by carboxylic acids may be used as a preparative method for the synthesis of cyclopentadienyl triacylates.

GLC study of redistribution reactions of radicals in organotin monohalide series

1. Employing GLC, it was shown that the reactions between R2SnR 2 ′ or RSnR 3 ′ compounds and alkyltin di- or trihalides proceed in two directions, which are determined by the nature of the R and R′ radicals on the metal atom. Based on the obtained data, a method was developed for the synthesis of unsymmetrical organotin monohalides of the aliphatic series. 2. A new reaction was found for the redistribution of radicals between organotin monohalides of the aliphatic series.