Involved in the degradation of the phenoxypropionate herbicides. Catalyzes the enantiospecific cleavage of the ether bond in the herbicid R-dichlorprop ((R)-2-(2,4-dichlorophenoxy)propionate)(R-2,4-DP) and R-mecoprop ((R)-2-(4-chloro-2-methylphenoxy)propionate)(R-2,4-MCPP). It can also accept (RS)-4-chlorophenoxypropanoate, however it can only accept 2-oxoglutarate as oxygen acceptor. (R)-2-(4-chloro-2-methylphenoxy)propanoate + 2-oxoglutarate + O2 = 2-methyl-4-chlorophenol + CO2 + pyruvate + succinate (R)-(2,4-dichlorophenoxy)propanoate + 2-oxoglutarate + O2 = 2,4-dichlorophenol + CO2 + pyruvate + succinate kcat is 114.2 min(-1) for dioxygenase activity with R-2,4-MCPP (at pH 6.75 and 30 degrees Celsius). kcat is 135.6 min(-1) for dioxygenase activity with alpha-ketoglutarate (at pH 6.75 and 30 degrees Celsius). kcat is 170.1 min(-1) for dioxygenase activity with R-2,4-DP (at pH 6.75 and 30 degrees Celsius). kcat is 241.9 min(-1) for dioxygenase activity with (RS)-4-chlorophenoxypropanoate (at pH 6.75 and 30 degrees Celsius). kcat is 252 min(-1) for dioxygenase activity with R-2,4-MCPP (at pH 6.75 and 30 degrees Celsius). Optimum pH is about 6.5. Optimum temperature is between 35 and 40 degrees Celsius. Xenobiotic degradation; 2-(2,4-dichlorophenoxy)propanoate degradation. Homotrimer. Belongs to the TfdA dioxygenase family.