3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho(

Details 3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho( 3-Substituted-7-alkoxy-spiro(2H -1-benzopyran-2,3'-(3H)-naphtho(

1981-10-22

1983-05-03

Chan, Nicky

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

549344, C08F23402, C07D31196

Patent

active

043821340

ABSTRACT:
Substituted spiropyrans particularly suitable for use as precursors to stable pyrylium salts are disclosed.

REFERENCES:
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patent: 3810762 (1974-05-01), Laridon et al.
patent: 3810763 (1974-05-01), Laridon et al.
patent: 3899514 (1975-08-01), Baumann et al.
patent: 3971808 (1976-07-01), Baumann et al.
patent: 4029677 (1977-06-01), Baumann et al.
patent: 4110348 (1978-08-01), Baumann et al.
patent: 4348508 (1982-07-01), Herweh et al.
Feichtmayr et al., Liebigs Ann. Chem., 1979(9), 1337-1345.

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