The preparation of magnesium, zinc or lithium malonic or acetoacetic type enolates through halogen-metal interconversion or direct reaction of a metal on the appropriate halogenated compound is reported. The properties of these new reagents (electrophilicity, nucleophilicity and stability) are compared to those of gem-halogenated organometallics and unchelated enolates.
据报道,通过卤素-
金属互变或
金属与适当的卤代化合物的直接反应制备
镁,
锌或
丙二酸锂或
乙酰乙酸型烯醇化物。将这些新试剂的性质(亲电子性,亲核性和稳定性)与宝石卤代有机
金属和未螯合的烯醇化物进行了比较。