Used as a Wittig reagent in organic synthesis to convert aldehydes and ketones into α,β-unsaturated esters. This transformation is valuable for constructing carbon-carbon double bonds, especially in the synthesis of conjugated systems found in pharmaceuticals, agrochemicals, and fine chemicals. The methoxycarbonyl group enables further functionalization or hydrolysis to carboxylic acids, making it useful in multi-step synthetic routes. Commonly employed in the preparation of styrene derivatives and other aromatic olefins. Its solid form and stability facilitate handling and storage in laboratory settings.