Process for purifying sterically hindered 4-amino piperidines
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United States of America Patent
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-
Jan 4, 2000
Grant Date -
N/A
app pub date -
Nov 12, 1998
filing date -
Jun 3, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for purifying crude piperidines of the formula I ##STR1## where R.sup.1 to R.sup.4 are C.sub.1 -C.sub.6 -alkyl, or R.sup.1 and R.sup.2 and/or R.sup.3 and R.sup.4 together are a CH.sub.2 -chain of 2 to 5 carbons, which comprises, in a first step, removing high-boiling substances and, if present, water from the crude piperidines by distillation; in a second step, adding from 0.01 to 5% by weight, based on the product of the first step, as a reducing agent; and, in a third step, isolating the piperidines by distillation.
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