Preparation of polycyclic dyes
US5362888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Jun 14, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of a polycyclic dye of Formula (1): ##STR1## by reacting a compound of Formula (2): ##STR2## with a benzofuranone of Formula (3): ##STR3## wherein: R.sup.1 and R.sup.2 each independently is --H or alkyl; PA1 R.sup.3 is alkyl; PA1 R.sup.4 is --H or alkyl; PA1 R.sup.5 and R.sup.6 each independently is alkyl; or PA1 R.sup.5 and R.sup.6 together with the N atom to which they are attached form a heteroalicyclic ring; and PA1 Ring A is unsubstituted or is substituted by from one to three substituents provided that at least one of R.sup.1, R.sup.2 and R.sup.4 is --H. The polycyclic dyes of Formula (1) are useful for the coloration of synthetic textiles such as polyester to which they impart blue to navy shades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.