| 摘要 |
PURPOSE:To obtain the titled compound useful as an electron donative colorant for pressure-sensitive recording paper and for heat-sensitive recording paper simply and inexpensively in high yield, by subjecting an inexpensive lactone compound to intramolecular ring closure with an aluminum halide and a carbonyl compound. CONSTITUTION:A lactone compound shown by the formula I (R<1>-R<3> are H, alkylamino, dialkylamino, pyrrolidino, or piperidino) and a mixture of an aluminum halide such as AlCl3, etc. in a molar ratio of the aluminum halide to the compound of >=15, preferably 20-30 and a carbonyl compound are subjected to an intramolecular ring closure in an inert atmosphere such as preferably N2, etc. at 70-200 deg.C, preferably at 90-150 deg.C to give the aimed compound shown by the formula II (X and Y are C or N; with the proviso that R<1>=R<2>not equal to H). One or a mixture of two or more of urea, N-methylpyrrolidone, formamide, dimethylformamide, formic acid, sodium formate, acetic acid, sodium acetate, etc. may be used as the carbonyl compound. |
