Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1990-08-21
1992-03-10
Springer, David B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
548454, C07D40502
Patent
active
050951203
ABSTRACT:
A process for preparing photochromic spiropyran compounds having a halogen atom or atoms and a hydrophobic alkyl group wherein a starting photochromic spiropyran compound having the hydrophobic alkyl group is reacted directly with a halogenating agent in a solvent. This reaction efficiently proceeds with the product being obtained in high yield.
REFERENCES:
patent: 4565779 (1986-01-01), Arakawa et al.
Chemical Abstracts, vol. 88, No. 15, 10 Apr. 1978, Columbus, Ohio, U.S.A., E. R. Zakhs et al.
Chemical Abstracts, vol. 83, No. 17, 27 Oct. 1975, Columbus, Ohio, U.S.A., N. B. Samoilova.
Ando Eiji
Hibino Junichi
Matsushita Electric - Industrial Co., Ltd.
Springer David B.
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