New compounds were unexpectedly discovered in a detailed study of the cyclization of α-aminated carbocyclic ketones with malonic dialdehyde tetramethyl acetal, in addition to the formation of the corresponding pyrazoles. In the case of cyclopentanone these new products are 6,7-dihydro-2H-cyclo-penta[c]pyridazine-4-carbaldehyde and 3-hydroxy-2,2-di(1H-pyrazol-1-yl)cyclopentanone. For cyclo-hexanone
                                    除形成相应的
吡唑外,在用
丙二醛二醛四甲基
乙缩醛对α-胺基碳环酮进行环化的详细研究中意外发现了新化合物。在
环戊酮的情况下,这些新产品是6,7-二氢-2 H-环戊[ c ]
哒嗪-4-甲醛和3-羟基-2,2-二(1 H-
吡唑-1-基)
环戊酮。对于
环己酮,是环化成
吡唑的中间体,即1-(2-氧代-环己基)-2-(3-氧代丙-1-烯-1-基)
肼甲酸的叔丁酯,被隔离了。