Photochromatic substances
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United States of America Patent
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Mar 4, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Oct 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed are adamantaneospiroheteroaromaticpyrans and adamantanospiro (1.3)oxazines of the general formula ##STR1## whereby R.sub.0 is a substituent from the series H, halogen, O-alkyl, N-alkyl, R.sub.1 -R.sub.4 : is a substituent from the series H, alkyl, aryl, subst. phenyl, naphthyl, heteroaryl, OH, alkoxy (C.sub.1 -C.sub.4), halogen, alkylamino, dialkylamino, cyan and trifluormethyl, or R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 or R.sub.2 and R.sub.3 are constituents of a condensed aromatic or heteroaromatic ring or an alkane ring with 4-8 C-atoms.
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