7-Dimethylamino-3-substituted-2,2'-spirobi[2H-1-benzopyrans]

Details 7-Dimethylamino-3-substituted-2,2'-spirobi[2H-1-benzopyrans] 7-Dimethylamino-3-substituted-2,2'-spirobi[2H-1-benzopyrans]

1981-06-25

1982-08-03

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

430345, 430955, C07D31104

Patent

active

043426964

ABSTRACT:
Substituted spirobi[2H-1-benzopyrans] particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

REFERENCES:
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patent: 3971808 (1976-07-01), Baumann et al.
patent: 4029677 (1977-06-01), Baumann et al.
patent: 4110348 (1978-08-01), Baumann et al.
Feichtmayr et al., Liebigs Ann. Chem., 1979 (9), 1337-45.

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