| 摘要 |
NEW MATERIAL:The compound of formula I (R1-R4 are 1-4C alkyl or allyl; n is 4 or 5). EXAMPLE:3,6-Bis(dimethylamino)fluorene spiro(9,3')-6'.pyrrolidinophthalide. USE:An electron donative color-developing agent. It gives a recording material having excellent color-development sensitivity and color density and giving a color image having high fastness to water and light. PREPARATION:The objective compound can be produced e.g. by diazotizing a compound of formula II e.g. with sodium nitrite in an inorganic acid (preferably sulfuric acid) preferably at -5-+10 deg.C and cyclizing the diazo compound under stirring for several hr-several tens hr at 10-130 deg.C in the presence of a copper compound (preferably copper powder, etc.).
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