发明公开
EP1119560A1 NAPHTHOPYRANS ANNELATED IN C5-C6, THEIR PREPARATION AND COMPOSITIONS AND (CO) POLYMER MATRICES CONTAINING THEM 有权
萘并IN C5-C6 ANNE均需,生产和含有PREPARATIONS AND(CO)聚合物基质

NAPHTHOPYRANS ANNELATED IN C5-C6, THEIR PREPARATION AND COMPOSITIONS AND (CO) POLYMER MATRICES CONTAINING THEM
摘要:
The invention relates to novel compounds of the naphthopyran type which have an annelated carbocycle in position 5, 6. These compounds are of formula (I) in which A is an alicyclic ring which is optionally annelated with an aromatic ring and in which two adjacent R3 can together form at least one ring, for example a benzo group. These compounds (I) possess interesting photochromic properties. The invention also relates to the method of preparing these compounds (I), as well as their applications as photochromes: compositions and (co)polymer matrices comprising them.
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