Process for the preparation of photochromic compounds of the annelated spiro?indoline?2,3'! benzoxazine!type
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 3, 1998
Grant Date -
N/A
app pub date -
Apr 4, 1997
filing date -
Jul 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present disclosure relates to a process for the preparation of photochromic compounds of the annelated spiro?indoline?2,3'!benzoxazine! type comprising the reaction of a Fisher base (I) having a 2-alkylidene indoline structure with a condensed ortho-aminophenol compound (II) in the presence of an oxidizing agent. The Fisher base, condensed ortho-aminophenol and the oxidizing agent may be mixed together simultaneously in order to carry out the reaction. Alternatively, the oxidizing agent may be reacted with the Fisher base in a first step and condensed ortho-aminophenol may then be added to the reaction mixture thus obtained.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully