C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/469
C07C 125/06 (1980.01)
Patent
CA 1166650
Mo-2239 LeA 20,581 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 ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of N- and O-substituted mono- or bis-urethanes, characterized in that urethanes corre- sponding to the following general formula: R1?NH-CO-O-R2)n wherein R1 represents either an n-functional, aliphatic C1-C6 hydrocarbon radical optionally containing ether bridges or an n-functional cycloaliphatic C6-C13 hydrocarbon radical; R2 represents a hydroxyalkyl group containing 2 or 3 carbon atoms, 2 carbon atoms being arranged between the oxygen atom of the hydroxyl group and the oxygen atom of the urethane group; and n represents 1 or 2; are subjected to a transesterification reaction using alcohols containing only primary hydroxyl groups and corresponding to the following general formula: R3?OH)m wherein R3 represents a monofunctional (m = 1), linear or branched saturated aliphatic C8-C18 hydrocarbon radical optionally containing ether bridges, a monofunctional (m = 1), araliphatic C8-C15 hydrocarbon radical or a difunctional (m = 2), linear or branched, saturated aliphatic C3-C18 hydrocarbon radical optionally con- taining ether bridges, in which at least 3 carbon atoms are arranged between the 2 hydroxyl groups; and Mo-2239 LeA 20,581 m represents 1 or 2, with the proviso that not both m and n represent 2; in the presence of catalysts selected from; (i) thallium oxides, thallium hydroxides, thallium salts of organic acids, thallium salts of weak inorganic acids and organic complex compounds of monovalent thallium and, (ii) salts of organic acids of divalent and tetravalent tin and organic compounds of tetravalent tin with organ- ic residues which are not bound like salts, the reaction being accompanied by the elimination of alcohols corresponding to the following general formula: R2-OH. Mo-2239 LeA 20,581
385292
Buysch Hans-Josef
Krimm Heinrich
Aktiengesellschaft Bayer
Swabey Mitchell
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