| 摘要 |
<p>Cpds. of formula (I) (in which R1 is halogen, R3 and R4 are 1-25C alkyl, R2 can be various gps.) are prepd. by reaction of an aryl isocyanate of formula (II) with an alkylamine of formula HN(R3R4 (in which R1 to R4 are as in formula (I)). The reaction is carried out in inert organic solvent such as acetone, at 15-45 deg.C.</p> |
