Method for the preparation of alkyl tin halides
US4049689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1975 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Nov 21, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/2208
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In the process for the preparation of alkyl tin halides by means of direct conversion of tin with aliphatic halides, the alkyl halide is fed in such a way gradually to the gas space over the further reaction components that there is an overpressure of no more than a few cms of mercury. The reaction is carried out in the presence of a liquid acid amide in quantities of 0.65 to 2.3 mol per gramatom of tin and in the presence of catalytic amounts of iodine and/or iodide at raised temperatures. The reaction is promoted under the influence of ultraviolet irradiation and by the addition of a catalyst of the type promoting free radial initiation reactions. SU PAC BACKGROUND OF THE INVENTION The invention relates to the preparation of alkyl tin halides by means of direct conversion of tin with aliphatic halides under the influence of liquid compounds of the acid amide type and of iodine and/or iodide as a catalyst. Such reactions are known in the art under application of a phosphorus compound with at least one nitrogen atom in the molecule as a catalyst. It has also been suggested to use organic nitrogen compounds and ammonium halides as catalysts. The reaction is mostly carried out at tem…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.