| 摘要 |
1,142,553. Ureido-pyrazolone derivatives. FUJI SHASHIN FILM K.K. 13 July, 1967 [13 July, 1966], No. 32396/67. Heading C2C. [Also in Division G2] Compounds of the formula wherein RCO represents an acyl group having from 18 to 25 carbon atoms and Ar represents a phenyl group having at least one substituent at the ortho position, said substituent being halogen, alkyl or alkoxy, may be obtained by conventional methods, for example by reacting m-nitrophenyl isocyanate with an appropriate 3-amino-5-pyrazolone (which itself may be obtained by reacting an appropriately substituted hydrazine derivative with ethyl #- ethoxy-#-iminopropionate), reducing the nitro group in the resultant product and reacting the corresponding amino derivative thus obtained with an appropriate acyl chloride RCOC1. Several examples are described in which the RCO group is a substituted or unsubstituted aliphatic acyl group or a group corresponding to one of the following formulµ wherein R 1 is hydrogen or an alkyl group having not more than 3 carbon atoms, R 2 is an alkyl group having not more than 5 carbon atoms, R 3 is an alkyl group having from 5 to 16 carbon atoms, and n is an integer of from 1 to 5. |
