| 摘要 |
NEW MATERIAL:A fulgide derivative of formula (R is 5-31C alkyl). USE:A photochromic material. PREPARATION:The E-isomer of the compound of formula exhibiting photochromism is preferentially produced by condensing a furyl ketone having corresponding 5-31C alkyl chain with diethyl isopropylidenesuccinate. There is absolutely no production of the Z-isomer free of photochromism, because the isomer is unstable owing to the steric hindrance caused by the introduced 5-31C alkyl chain.
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