Among the various derivatives of phenoxyacetic acids, 2,4-D (salts and esters) and MCPA (salts) are widely used as herbicides ...

Rogoff, M. H., and Reid, J. J., J. Bact., 71, 303 (1956).

These compounds are mainly formed by thermal processes involving chlorine organic compounds such as burning urban waste and forest fires. These compounds have also been formed in pulp and paper ...