Used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Its aldehyde and chloro functional groups allow for versatile reactivity, enabling ring formation or chain extension in molecule construction. Commonly employed in the synthesis of heterocyclic compounds and as a building block for gamma-chloroalkyl aldehydes. Also finds use in fragrance chemistry due to its ability to form cyclic structures upon cyclization. Handle with care due to its reactivity and potential lachrymatory effects.