Spirodipyrans

Details Spirodipyrans Spirodipyrans

1978-08-08

1979-07-17

Trousof, Natalie

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544 58, 544 60, 544 61, 544150, 544230, 544378, 2603261, 428411, C07D49310

Patent

active

041615891

ABSTRACT:
Spirodipyrans of the formula ##STR1## where A is the radical of a fused benzene ring or 2,1-naphthalene ring, the rings being unsubstituted or substituted by alkyl, alkoxy, nitro, chlorine, bromine or carbalkoxy,

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