Process for producing N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)a

Details Process for producing N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)a Process for producing N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)a

1993-01-14

1994-06-21

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40114

Patent

active

053229479

ABSTRACT:
Crude N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)alkanediamine represented by the formula: ##STR1## wherein n is an integer of 2 to 10, is purified by crystallization from a ketone solvent of 3 to 9 carbon atoms. The purified product thus obtained has a purity of 98% by weight or more, a 2,2,6,6-tetramethyl-4-piperidone content of 150 ppm or less, and an initial APHA value of 30 or less. The purified product is also inhibited from discoloration with the passage of time.

REFERENCES:
patent: 4086204 (1978-04-01), Cassandrini et al.
patent: 4104248 (1978-08-01), Cantatore
patent: 4331586 (1982-05-01), Hardy
patent: 4607104 (1986-08-01), Malz, Jr. et al.
Condensed Chemical Dictionary 5th Ed. Grant & Hackh's, p. 161 "Crystallization".

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