| 摘要 |
Indolines of the formula <IMAGE> wherein R1 is hydrogen or C1-C4 alkyl and each of R2 and R3 independently of the other is hydrogen, C1-C4 alkyl or phenyl, are prepared by cyclodehydrating a 2-(2'-aminophenyl)ethanol of formula <IMAGE> wherein R1, R2 and R3 are as defined above, at 150 DEG -350 DEG C. in the presence of an amorphous aluminum silicate. The indolines of the above formula are useful intermediates for the synthesis of plant protective agents.
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