Used as an intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals. Its reactivity allows for the introduction of malonyl groups into complex molecules, facilitating carbon-chain elongation and the formation of carboxylic acid derivatives. Commonly employed in acylation reactions and in the synthesis of active pharmaceutical ingredients where a bifunctional building block is required. Also utilized in research settings for the development of novel esters and amides through nucleophilic substitution. Due to its sensitivity to moisture, it must be handled under anhydrous conditions.