Nir dyes, methods of preparing them and their use
US5391762A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B11/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The compounds of the formula I ##STR1## in which Y and Y.sub.1 are each, independently of one another, O, S, NH or N-alkyl, N-cycloalkyl, N-phenyl or N-benzyl, or Y and Y.sub.1 are together N-alkylene-N, R and R.sub.1 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, R.sub.2 and R.sub.3 are each, independently of one another, H, or R.sub.2 forms, together with R.sub.6 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.3 is H, or R.sub.3 forms, together with R.sub.7 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.2 is H, R.sub.4 and R.sub.5 are each, independently of one another, H, R.sub.4 forms, together with R.sub.8 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.5 is H, or R.sub.5 forms, together with R.sub.9 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.4 is H, R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, or R.sub.6 and R.sub.8 and/or R.sub.7 and R.sub.9 form, together with the N atom linking them, a piperidine radical, a morpholine radical or an unsubstituted piperazine radical or a piperazin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.