Spiro-pyranic compounds endowed with photochromic characteristic

Details Spiro-pyranic compounds endowed with photochromic characteristic Spiro-pyranic compounds endowed with photochromic characteristic

1994-05-12

1996-07-02

Tsang, Cecilia

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544230, 546 15, 546 18, 549331, C07D41308, C07D491107, C07D40508, C07D31196

Patent

active

055323618

ABSTRACT:
Photochromic compounds belonging to the class of spiro-pyrans, having the general formula (I): ##STR1##

REFERENCES:
patent: 3413234 (1968-11-01), Taylor et al.
patent: 3578602 (1971-05-01), Ono et al.
Grant, R. et al. Grant & Hackh's Chemical Dictionary (McGraw-Hill, New Yo, p. 115 (1987).
Rigaudy, J. et al. IUPAC Nomenclature of Organic Chemistry (Pergamon, Oxford), p. 265 (1979).

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