Squarylium compounds, and processes and intermediates for the synthesis of these compounds
US5919950A · kind A · utility
2Cited by
26References
15Claims
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Key dates
| Filing date | Apr 23, 1993 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Apr 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/246
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Squarylium compounds of the formula: ##STR1## wherein Q.sup.1 and Q.sup.2 are each independently a pyrylium, thiopyrylium, selenopyrylium, benzpyrylium, benzthiopyrylium or benzselenopyrylium nucleus, and R.sup.1 and R.sup.2 are each independently an aliphatic or cycloaliphatic group, can be prepared by reacting a squaric acid derivative of the formula: ##STR2## with a compound of the formula Q.sup.2 CH.sub.2 R.sup.2 in the presence of a base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.