Michael reaction
Some authors have broadened the definition of the Michael addition to essentially refer to any 1,4-addition reaction of α,β-unsaturated carbonyl compounds. Others, however, insist that such a usage is an abuse of terminology, and limit the Michael addition to the formation of carbon–carbon bonds through the addition of carbon nucleophiles. The terms "oxa-Michael reaction" and "aza-Michael reaction" have been used to refer to the 1,4-addition of oxygen and nitrogen nucleophiles, respectively.