Certain photochromic fulgide compounds and method for their synt

Details Certain photochromic fulgide compounds and method for their synt Certain photochromic fulgide compounds and method for their synt

1987-03-09

1989-02-07

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549483, 430343, C07D30760

Patent

active

048032875

ABSTRACT:
The invention provides a photochromic material characterized by an improvnt in balance of the substituents in the conventional furylfulgides and represented by the general formula: ##STR1## (wherein R represents an alkyl chain having 5 to 31 carbon atoms). According to this molecular structure, a mutually appropriate steric hindrance is induced between the isopropylidence group and the long-chain alkyl group to make the regio isomer unstable, thus preventing the regio isomer from being by-produced while also inhibiting any isomerization reaction from occuring in the synthesis of the fulgide. Further, a good balance of hydrophilic part and hydrophobic part is produced to facilitate formation of a Langmuir-Blodgett film.

REFERENCES:
patent: 4220708 (1980-09-01), Heller et al.
Heller et al., J. C. S. Perkin I, pp. 197-201 (1981).

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