Method of water treatment using 2,6-substituted aminopyridines a

Details Method of water treatment using 2,6-substituted aminopyridines a Method of water treatment using 2,6-substituted aminopyridines a

1991-04-03

1992-03-10

Schofer, Joseph L.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

524922, C02F 156

Patent

active

050947591

ABSTRACT:
The present invention is a compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently C.sub.1-20 alkyl unsubstituted or substituted with a C.sub.1-3 alcohol, or allyl unsubstituted or substituted with a C.sub.1-4 alkyl or phenyl, R.sup.3 and R.sup.4 are independently hydrogen, or C.sub.1-20 alkyl unsubstituted or substituted with a C.sub.1-3 alcohol or together R.sup.3 and R.sup.4 are oxygen, and R.sup.5 and R.sup.6 are independently C.sub.1-20 alkyl unsubstituted or substituted with C.sub.1-3 alcohol or phenyl, hydroxy, --(CH.sub.2).sub.1-3 COOH, --CHR.sup.7 COOH wherein R.sup.7 is C.sub.1-5 alkyl or C.sub.1-5 alkyl substituted with hydroxy, amino, or carboxy, or allyl unsubstituted or substituted with a C.sub.1-4 alkyl or phenyl or together R.sup.5 and R.sup.6 with the two nitrogen atoms form a fused ring having the formula ##STR2## wherein n is 1 or 2, or form a fused ring having the formula ##STR3## wherein p is an integer from 0 to 3.

REFERENCES:
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patent: 4927923 (1990-05-01), Mathis
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Scriven, E. F. V., "4-Dialkylaminopyridines: Super Acylation and Alkylation Catalysts", Chem. Soc. Rev., vol. 12, p. 129 (1983).
Koning, C. E. et al., "Copper (II) Complexes of `Polystyrene-Bound DMAP`: Synthesis, Structure and Catalytic Activity in the Oxidative Coupling of 2,6-Dimethylphenol", Reactive Polymers, vol. 4, p. 293 (1986).
Bradshaw, J. S. et al., "Cation Complexing Properties of Synthetic Macrocyclic Polyether-Diester Ligands Containing the Pyridine Subcyclic Unit", J. Am. Chem. Soc., vol. 102, p. 5139 (1987).
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