Alkylated polyalkylene polyamines and process for selective alkylation
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United States of America Patent
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Feb 23, 1993
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app pub date -
Mar 2, 1989
filing date -
Feb 19, 1982
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Abstract
A branched chain polyalkylene polyamine ('PAPA') having plural amine groups, including a secondary amine group intermediate terminal primary amine groups one of which is hindered, and having at least two carbon atoms between each group, is selectively reductively alkylated with a ketone. The reaction provides a convenient method for selectively reductively alkylating a PAPA having a hindered primary amine group, the method comprising contacting the PAPA with hydrogen and the ketone in the presence of a catalytically effective amount of a Group VIII metal on a catalyst support, at a pressure in the range from about 500-1000 psi and a temperature in the range from about 50.degree. C. to about 200.degree. C. for a period of time sufficient to preferentially alkylate the unhindered amine primary terminal amine group. The alkylation proceeds essentially without alkylating either the sterically hindered terminal primary amine group or the intermediate unhindered secondary amine group.
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