Photochromic gamma butyrolactones

Details Photochromic gamma butyrolactones Photochromic gamma butyrolactones

1987-06-03

1989-08-29

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 60, 549320, C07D23356

Patent

active

048618993

ABSTRACT:
The invention relates to a photochromic gamma butyrolactone having the general formula (I): ##STR1## in which X represents >CH.sub.2 or >C(CH.sub.3).sub.2 ; R.sub.1, R.sub.2 and R.sub.4 independently represent a group selected from hydrogen, alkyl or aryl (including substituted aryl), with the proviso that one of R.sub.1 and R.sub.2 is always hydrogen, and R.sub.3 is a 3-thienyl, 3-furyl, 3-benzothienyl or 3-benzofuryl group in which the 2-position is substituted with an alkyl, aralkyl or aryl group (including substituted aryl).
The lactones are useful in photolithography and in the production of security inks and markings and in the production of data recording materials.

REFERENCES:
patent: 4145536 (1979-03-01), Heller
patent: 4220708 (1980-09-01), Heller
patent: 4685783 (1987-08-01), Heller et al.
Chemical Abstracts, vol. 91, No. 3, Abstract 20213d, Jul. 16, 1979.
Trundle, "Substituent Effects on Photochromic Fulgides", 1980.

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