Bis-type quaternary salts including benzothiazole and benzimidazole rings and process for preparing dye therewith
US3976640A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1975 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Feb 18, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/14
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel bis type heterocyclic quaternary salts are provided which are useful in the preparation of various linked cyanine dyes and related compounds. BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to chemistry and, more particularly, to novel double or "bis-type" quaternary salts of heterocyclic bases and processes useful in the synthesis of various linked cyanine dyes and related compounds. 2. Description of the Prior Art Most of the reactions leading to cyanine dyes and those compounds related to them are of the condensation type wherein two active dye intermediates react under suitable conditions with the elimination of some simple molecule, such as mineral acid, mercaptan, alcohol, water, aniline or acetanilide. These intermediates fall into two categories: (1) those containing reactive hydrogen, and (2) those containing a reactive group, such as halogen, cyano, alkyl- or arylmercapto, alkoxy, anilino, or acetanilido, which is capable of dye condensation with the reactive hydrogen of the first component. In the synthesis of "true" cyanine materials, intermediates of the first type are usually quaternary salts of heterocyclic bases containing a reacti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.