PROCESS FOR THE PRODUCTION OF N- AND O-SUBSTITUTED MONO- OR BIS-URETHANES AND THE USE THEREOF AS STARTING MATERIAL FOR THE PRODUCTION OF ALIPHATIC ISOCYANATES

摘要

Mo-2239LeA 20,581PROCESS FOR THE PRODUCTION OF N- AND O-SUBSTITUTED MONO- OR BIS-URETHANES AND THEUSE THEREOF AS STARTING MATERIAL FOR THEPRODUCTION OF ALIPHATIC ISOCYANATESABSTRACT OF THE DISCLOSUREThe present invention is directed to a processfor the production of N- and O-substituted mono- orbis-urethanes, characterized in that urethanes corre-sponding to the following general formula:R1?NH-CO-O-R2)nwhereinR1 represents either an n-functional, aliphatic C1-C6hydrocarbon radical optionally containing ether bridgesor an n-functional cycloaliphatic C6-C13 hydrocarbonradical;R2 represents a hydroxyalkyl group containing 2 or 3carbon atoms, 2 carbon atoms being arranged betweenthe oxygen atom of the hydroxyl group and the oxygenatom of the urethane group; andn represents 1 or 2;are subjected to a transesterification reaction usingalcohols containing only primary hydroxyl groupsand corresponding to the following general formula:R3?OH)mwhereinR3 represents a monofunctional (m = 1), linear orbranched saturated aliphatic C8-C18 hydrocarbon radicaloptionally containing ether bridges, a monofunctional(m = 1), araliphatic C8-C15 hydrocarbon radical or adifunctional (m = 2), linear or branched, saturatedaliphatic C3-C18 hydrocarbon radical optionally con-taining ether bridges, in which at least 3 carbonatoms are arranged between the 2 hydroxyl groups; andMo-2239LeA 20,581m represents 1 or 2, with the proviso that not bothm and n represent 2;in the presence of catalysts selected from; (i) thalliumoxides, thallium hydroxides, thallium salts of organicacids, thallium salts of weak inorganic acids andorganic complex compounds of monovalent thallium and,(ii) salts of organic acids of divalent and tetravalenttin and organic compounds of tetravalent tin with organ-ic residues which are not bound like salts, the reactionbeing accompanied by the elimination of alcoholscorresponding to the following general formula:R2-OH.Mo-2239LeA 20,581