In attempts to synthesize metal complexes with unique coordination geometries and properties, researchers have turned to the design and preparation of new ligands systems that possess considerable steric capacity. It is well established in the literature that steric thiolates stabilize high oxidation states of metals in complexes that were not readily available by other routes (Koch & Millar groups). Both methyl and isopropyl groups have shown considerable steric property when at the ortho-position of a benzenethiol, as developed by Millar & Koch groups. In an effort to extend the steric capacity of ortho-methyl and ortho-isopropyl ligands, we have sought out a new class of ligands which contain cyclohexyl substituents in the ortho-position.  These should exhibit steric capacity analogous to that of the 2,6-diphenylbenzene derivatives, yet be more basic in their donor capacity.  In this poster, work with 2,4,6-tricyclohexylbenzenethiol and metal complex with it will be presented.Brookhart et.al. have reported late transition metal complexes of a-diimines as excellent catalysts for olefin polymerization. Subsequently, Brookhart et.al. & Gibson et.al. have independently reported the metal complexes from pyridine(bisanil) compounds as highly efficient catalysts for the same purpose. Studies have shown that for the catalysis, the ortho-position of the derivatized aniline moiety must possess enough steric bulk. In our effort, we have synthesized and characterized a-diimines and pyridine(bisanil) native ligands as well as metal complexes starting with 2,4,6-tricyclohexylaniline.In this poster we present a detail of the synthesis and characterization of the native ligands, and selected metal complexes with the aforesaid ligands.

Chemistry with steric ligands to explore metal compounds for (a) models of the active sites in biologically relevant metalloenzymes and (b) olefin polymerization catalysts

244th National Meeting (2012)

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