First Isolation of an Enol of a Carboxylic Acid by Complexation to an (Ethane-1,2-diamine)-platinum(II) Fragment

摘要

Enol isomers of simple aldehydes and ketones have been known fora longtime, but very little is known about theenols of other carbonyl compounds such as carboxylic acids and carbonic acid esters. On account of the high thermodynamic instability with respect to the carboxylic acid isomer it has so far not been possible to isolate a geminal enediol or its metal derivative. Only a few enols of carboxylic acids in solution are known. kw:enediols; keto--enol tautomerism; platinum compounds