| 摘要 |
alpha , beta -Diaminoacrylonitriles of the general formula I R3R2NC(R1)=C(NR2R3)CN I where R1, R2 and R3 are identical or different and independently of one another are each hydrogen, alkyl, cycloalkyl, aralkyl, aryl or a heterocyclic radical, and the organic radicals R2 may furthermore be bonded to one another to form a 6-membered or 7-membered ring, or R2 and R3 may be bonded to one another to form a 5-membered or 6-membered ring, are prepared by reacting an alpha -dicarbonyl compound R1COCHO, or a reactive derivative of this with (a) a salt of sulfurous acid or sulfur dioxide, (b) an amine HNR2R3 or an aliphatic diamine R3HN-(CH2)nNHR3 where n is 2 or 3 and (c) hydrocyanic acid or a hydrocyanic acid donor in any sequence.
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