Note on the product of the reaction between the monosulphid of potassium and the bromid of ethylene, and on several compounds derived from it

J. M. Crafts
1864 American Journal of Science  
8everal compounds derived from it;l by J. M. CRAFTS. WHEN an alcoholic solution of monosulphid of potassium is mixed with the chlorid of ethylene, no reaction takes place immediately, but the mixture, after remaining exposed to the air several days, deposits a precipitate, whose composition is ex· pressed by the empyrical formula, CaH4S, When higher suIphids of potassium are employed, compounds containing more sulphur than the preceding are still more readily obtained. These bodies, discovered
more » ... y L6wig and Weidmann and described by them as sulpbids of ethylene, can not be distilled, but are decomposed by heat into various products, of which the principal is a sulphuretted oil, whose composition has not been determined. (Vide Gmelin, vol. iv.) No direct combinations of these sulphids with other bodies have been obtained, and they must be considered as among those of the non-nitrogenous organic compounds, whose chemical character and properties are the least accurately known. It was with a view to studying the properties of the monosuIphid of ethylene, and particularly the action of chlorine and bromine upon it, that I attempted to prepare that body by means of the monosulpbid of potassium and the bromid of ethylene, instead of with the chlorid, because, in similar donble decompositions, bromine in combination with organic radicals is more easily replaced by other elements or radicals tban chlorine. The analogy was found to hold good in the present instance in so far that the bromid of ethylene is more easil,Y attacked than the chlorid, but the products of this reaction differ entirely from those obtained by Lowig and Weidmann. This remarkable fact probably finds its explanation in the supposition of those chemists, that the sulphid of ethylene obtained by them was not the direct product of a douLle decomposition between the monosul. phid of potassium and the chlorid of ethylene, but resulted from aestruction of the immediate product of the reaction, through the oxydizing influence of the air. If equal parts of bromid of ethylene and monosulpbid of potassium, in solution in 6 parts of alcohol, are mixed together, a violent reaction, attended with disengagement of heat, commences after a few minutes: the whole mass becomes nearly solid from the formation of a voluminous precipitate, and at the
doi:10.2475/ajs.s2-37.111.390 fatcat:hvqhyde4e5dihodmrwk33wowwe