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US 5,512,675 AGranted
Methods for preparing porphyrin-like compounds
AssigneeThe University of British Columbia
InventorsHang Tang, Lily Xie, Tilak Wijesekera, David Dolphin
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Abstract
A method for synthesizing a porphocyanine having the formula: ##STR1## where each R is ethyl, comprises either: (1) treating 3,3'-4,4'-tetraethyl-5,5'-bisaminomethyl-2,2'-dipyrromethane with a 10-fold excess of DDQ or (2) treating 3,3'-4,4'-tetraethyl-5,5'-diformyl 2,2'-dipyrromethane with ammonia, followed by column chromatography purification and evaporating to dryness the eluant containing the purified product.
Claims2
A method for synthesizing a porphocyanine having the formula:
- ##STR6## wherein each R is a ethyl, comprising the steps of:
- (a) adding a ten-fold excess of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone to 3,3'-4,4'-tetraethyl-5,5'-bisaminomethyl-2,2'-dipyrromethane to produce a crude product;
- (b) purifying the crude product by chromatography on an alumina column;
- and then
- (c) evaporating the purified porphocyanine to dryness.
2 more elements
A method for synthesizing a porphocyanine having the formula:
- ##STR7## wherein each R is ethyl, comprising the steps of:
- (a) suspending 3,3'-4,4'-tetraethyl-5,5'-diformyl-2,2'-dipyrromethane in dry ethanol;
- (b) bubbling ammonia gas through the solution of step (a);
- (c) heating the product of step (b) at least about 60.degree. C. for at least about 72 hours;
- (d) cooling the product of step (c) to 0.degree. C.;
- (e) purifying the crude product by chromatography on an alumina column;
- and then
- (f) evaporating the purified porphocyanine to dryness.
5 more elements
Dependencies are inferred from the claim text.