Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Patent
1996-05-29
1997-04-29
Shah, Mukund J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
564307, C07D23970
Patent
active
056250622
ABSTRACT:
The present invention provides a novel process for the production of organic solvent soluble squaraine dyes. More specifically, the invention describes how a difficult to prepare tetrahydroxy squaraine intermediate can be prepared in an organic solvent system in the presence of water. This intermediate can then be esterified in pyridine to form the soluble squaraine dye which can then be easily isolated from the reaction mixture. The invention also provides the dyes prepared according to this method.
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Mader Roger A.
Ramsden William D.
Saddoris Daniel E.
Spawn Terence D.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Schulte Daniel C.
Shah Mukund J.
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