Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Patent
1986-09-26
1988-11-15
Raymond, Richard L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen in the nitrogen containing substituent
C07D49810, C07D49820
Patent
active
047850973
ABSTRACT:
Photochromic spiro-oxizine compounds are prepared by mixing in a substantially non-reactive organic solvent medium an alkylidene heterocyclic compound or halide salt thereof, e.g., an indoline, with a metal chelate of an ortho-hydroxynitrosoaromatic compound.
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Cottrell Bruce H.
PPG Industries Inc.
Raymond Richard L.
Stein Irwin M.
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