Nonsolvate-Form Crystal of Polymethine Compound, Process for Producing the Same and Use Thereof
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United States of America Patent
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Issued Date -
Apr 17, 2008
app pub date -
Dec 9, 2005
filing date -
Dec 15, 2004
priority date (Note) -
Abandoned
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Abstract
The object is to provide a novel nonsolvate-form crystal of polymethine compound which has good stability in solution, shows a high gram extinction coefficient, is excellent in storage stability, is easy to handle and is highly sensitive to general-purpose semiconductor lasers. Thus are provided a nonsolvate-form crystal of a polymethine compound of the formula (I) and a process for producing the nonsolvate-form crystal of polymethine compound of formula (I) which comprises reacting a polymethine ether compound of the formula (II) given below with p-toluenesulfonic acid. (In the above formula, TsO represents the p-toluenesulfonic acid residue.) (In the above formula, R represents an alkyl group, an alkoxyalkyl group or an optionally substituted aryl group.)
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