High yield of pyridine and/or alkylpyridine(s) in condensation r

Details High yield of pyridine and/or alkylpyridine(s) in condensation r High yield of pyridine and/or alkylpyridine(s) in condensation r

1990-06-07

1991-05-07

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546250, C07D2138, C07D2139, C07D21310

Patent

active

050138430

ABSTRACT:
A third aldehyde or ketone is added to a binary mixture of aldehyde and/or ketones used in preparing mixtures of pyridine and alkyl-substituted pyridines in large scale continuous processes. The amount of the third component is appropriately adjusted whereby the relative ratio(s) of products are adjusted and the total yield of pyridines and/or alkyl-substituted pyridines is high, all without any plant shut-down. In a preferred system, propionaldehyde is added to a binary mixture of acetaldehyde and formaldehyde to produce surprisingly high amounts of beta-pyridine and pyridine.

REFERENCES:
patent: 3946020 (1976-03-01), Minato et al.
patent: 4220783 (1980-09-01), Chang et al.
patent: 4675410 (1987-06-01), Feitler et al.
"Pyridine and Pyridine Derivatives", Goe, Kirk-Othmer, vol. 19, 454-483 (1982).
Golunski et al., Applied Catalysis, 23 (1986), 1-14.

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