prov:value
| - While any halogen, i.e., chlorine, bromine, iodine and fluorine, may be used in respect to the halogen or haloalkyl substituents, chlorine, fluorine and bromine, especially chlorine and fluorine is preferred for the halogen substituent and fluorine is preferred for the polyhaloalkyl substituent, e.g., trifluoromethyl (CF3) Preferably, R4 and R5 are each selected from the group consisting of C1 -C2
|