K. A. Kocheshkov

NMR Spectra of metal cyclopentadienyls: XIII. Synthesis of and rearrangements in C5H5GeX3

Abstract In this paper we present a detailed description of the synthesis of cyclopentadienylgermanium trichloride, cyclopentadienylgermanium trimethoxide and 1-cyclopentadienyl-2,8,9-trioxa-5-azagermatricyclo-3,3,3,0-undecane (cyclopentadienylgermatrane) C5H5G e(OCH 2 CH 2 ) 3 N , and the results of an NMR study of metallotropic rearrangement in these compounds.

Mass spectra of ethyldichloro- and trichlorogermylcyclopentadiene

1. A study was made of the dissociative ionization of ethyldichloro- and trichlorogermylcyclopentadiene, and schemes were proposed for their decomposition under electron impact. 2. The studied compounds can be differentiated from compounds of type h5-C5H5MX3 via mass spectrometry.

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.