1.3- Dimesitylimidazolium chloride, reaction

The reaction of 1,3-dimesitylimidazolium chloride with Ti(NMe2)4 results in the mixed ligand complex TiCl2(NMe2)2(carbene) (carbene = l,3-dimesitylimidazol-2-ylidene) (Scheme 112), the molecular structure of which has been determined by X-ray diffraction. The environment around the Ti atom is a distorted trigonal bipyramid with the two chloride ligands located in the apical positions. The structure shows short intramolecular Cl-C(carbene) contacts.224... 

The nickel acylate complex [Ni( 0)3 = (Bu)OLi ] reacts with mono- and disubstituted alkyne derivatives to afford 1,4-diketones, cyclopentenones or y-lactones, depending on the substitution pattern and the reaction time. " Nickelocene, [Ni(q - 5H5)2], reacts with 1,3-dimesitylimidazolium chloride to afford the carbene complex 63, the chloride ligand of which may be subsituted for a methyl group through further reaction with MeLi. Reduction of nickelocene with metallic sodium in the presence of either 1-pentene or 1-hexene results in alkene activation and formation of trinickel products containing p3-carbyne... 

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