215306-19-7Relevant academic research and scientific papers
Products of hydrolysis of C,N-chelated triorganotin(IV) chlorides and use of products as catalysts in transesterification reactions
Padělková, Zdeňka,Weidlich, Tomá?,Kolá?ová, Lenka,Eisner, Ale?,Císa?ová, Ivana,Zevaco, Thomas A.,R??i?ka, Ale?
, p. 5633 - 5645 (2008/03/18)
Triorganotin(IV) chlorides containing one LCN chelating ligand were hydrolyzed with an excess of sodium hydroxide. The composition of the products is strongly dependent on the nature of the organic groups bound to the tin atom. Di(n-butyl)tin, dimethyltin as well as the diphenyl derivative exhibits an equilibrium between hydroxide and stannoxane forms (oxide), whereas alkyltin species react spontaneously and reversibly with carbon dioxide present in the air to form carbonate species. On the other hand, diphenyl derivatives display virtually no reaction with CO2 towards carbonates, while the di-t-butyl-substituted tin derivative is stable under the same experimental condition and remains as a tin hydroxide. In the case of the dimethyltin derivative, a methyl group migration was observed with displacement of one LCN chelating ligand during the reaction on the air. The coordination geometry of the tin central atom(s) of all studied compounds can be described as trigonal bipyramidal with a dative bonded dimethylamino group occupying one coordination site. The catalytic activity of these compounds in transesterification reactions is generally lower compared to the systems reported in the literature, with the exception of the transesterification of ethyl acetate by cyclohexanol which displays a remarkable activity.
Monomeric triorganotin(IV) fluorides containing a C,N-chelating ligand
Bares, Josef,Novak, Petr,Nadvornik, Milan,Jambor, Roman,Lebl, Tomas,Cisarova, Ivana,Ruzicka, Ales,Holecek, Jaroslav
, p. 2967 - 2971 (2008/10/09)
The set of four triorganotin(IV) fluorides of general formula {2-[(CH 3)2NCH2]C6H4}R 2SnF, where R is Me (5), n-Bu (6), t-Bu (7), and Ph (8), respectively, has been prepared and characterized using NMR and ESI-MS techniques. The structures of crystalline compounds 5 and 8 were determined using X-ray methods. All compounds are monomeric both in solution using different solvents and in the solid state. The tin central atom is five-coordinated with all carbon atoms in equatorial positions and fluorine and nitrogen, from the intramolecularly coordinated dimethylamino group, in the axial positions of the distorted trigonal bipyramid. The ability of compounds 6 and 8 to perform fluorination of organometallic chlorides was tested on titanocene dichloride. A quantitative yield of Cp2TiF2 was obtained.
