The novel title cpds. are of formula (I) (where R1 and R2 are lower alkyl and R3 is alkenyl, (cyclo)alkyl, haloalkyl or where X is alkenyl, halogen, (halo)alkyl, NO2, alkoxy, alkylthio or dialkylamino; m is 0-3 and n is 0-3). They have selective herbicidal activity against weeds, e.g. wild oats, carpet weed and dandelion, and are applied at the rate of 1.2 oz - 10 lb/acre. They are prepd. by reacting first with HCHO then with NH2R3.
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