Process for the manufacture of fluoran compounds

Details Process for the manufacture of fluoran compounds Process for the manufacture of fluoran compounds

1991-09-30

1992-11-24

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549224, 549225, 549226, 548407, C07D49310, C07D21114

Patent

active

051663503

ABSTRACT:
A process for the preparation of a fluoran compound of the formula ##STR1## wherein R, R.sub.1, R.sub.2 and R.sub.4 are each independently hydrogen, halogen, lower alkyl or lower alkoxy,

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