Phenyl hydrazinecarboxylate is primarily used in organic synthesis as a reagent for the preparation of various heterocyclic compounds. It plays a significant role in the synthesis of pyrazole derivatives, which are important in the development of pharmaceuticals and agrochemicals. Additionally, it is utilized in the production of dyes and pigments, contributing to the vibrant colors in textiles and other materials. In research laboratories, it serves as a valuable intermediate for studying reaction mechanisms and developing new chemical entities. Its application extends to the field of analytical chemistry, where it is employed in the detection and quantification of specific organic compounds.