as defined above in which one or more including all the hydrogen radicals are replaced by a halo group wherein each halo group is independently selected from u2014 f u2014 cl u2014 br and u2014 i the term u201c halomethyl u201d means a methyl in which one to three hydrogen radical s have been replaced by a halo group representative haloalkyl groups include trifluoromethyl bromomethyl 1 2 dichloroethyl 4 iodobutyl 2 fluoropentyl and the like haloalkyl groups may be optionally substituted with one or more substituents haloalkyl groups included in compounds of this invention may be optionally substituted with a solubilising group as used herein the term u201c haloalkoxy u201d means an alkoxy group as defined above in which one or more including all the hydrogen radicals are replaced by a halo group wherein each halo group is independently selected from u2014 f u2014 cl u2014 br and u2014 i representative haloalkoxy groups include trifluoromethoxy bromomethoxy 1 2 dichloroethoxy 4 iodobutoxy 2 fluoropentoxy and the like haloalkoxy groups may be optionally substituted with one or more substituents haloalkoxy groups included in compounds of this invention may be optionally substituted with a solubilising group as used herein the term u201c substituent u201d or u201c substituted u201d means that a hydrogen radical on a compound or group is replaced with any desired group that is substantially stable to reaction conditions in an unprotected form or when protected using a protecting group examples of preferred substituents are those found in the exemplary compounds and embodiments disclosed herein as well as halogen alkyl as defined above hydroxy alkoxy as defined above nitro thiol thioalkyl as defined above cyano.