@article { ISI:000245141300021,
	title = {Controlled synthesis of low-molecular-weight polyethylene waxes by titanium-biphenolate-ethylaluminum sesquichloride based catalyst systems},
	journal = {Journal of Applied Polymer Science},
	volume = {104},
	number = {3},
	year = {2007},
	month = {MAY},
	pages = {1531-1539},
	publisher = {JOHN WILEY \& SONS INC},
	type = {Article},
	address = {111 RIVER ST, HOBOKEN, NJ 07030 USA},
	abstract = {<p>Soluble complexes of titanium(IV) bearing sterically hindered biphenols, such as biphenol, 1,1{\textquoteright}-methylene di-2-naphthol, 2,2{\textquoteright}-methylene bis(4-chlorophenol), 2,2{\textquoteright}-methylene bis(6-tert-butyl-4-ethyl phenol), and 2,2{\textquoteright} ethylidene bis(4,6-di-tert-butyl phenol), were prepared and characterized. These catalyst precursors, formulated as [Ti((OO)-O-boolean AND)X-2], were active in the polymerization of ethylene at high temperatures in combination with ethylaluminum sesquichloride as a cocatalyst. The ultra-low-molecular-weight polyethylenes (PEs) were linear and crystalline and displayed narrow polydispersities. The catalytic polymerization leading to PE waxes in this reaction exhibited unique properties that have potential applications in surface coatings and adhesive formulations. (c) 2007 Wiley Periodicals, Inc.</p>},
	keywords = {Catalysts, polyethylene (PE), synthesis, Ziegler-Natta polymerization},
	issn = {0021-8995},
	doi = {10.1002/app.25525},
	author = {Umare, Prashant S. and Rao, Karumanchi and Tembe, Gopal L. and Dhoble, Deepa Arun and Trivedi, Bhavna}
}
@article { ISI:000313230200031,
	title = {Catalytic and DFT study of selective ethylene oligomerization by nickel(II) oxime-based complexes},
	journal = {Journal of Molecular Catalysis A-Chemical},
	volume = {366},
	year = {2013},
	month = {JAN},
	pages = {238-246},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>The reactivity of nickel(II) thiophenealdoxime complex (3) toward oligomerization of ethylene in the presence of an alkylaluminum co-catalyst has been studied. The complex was found to be a selective ethylene dimerization catalyst in the presence of co-catalysts such as methylalumoxane (MAO) and diethylaluminum chloride (DEAC). With DEAC, the productivity was considerably higher than with MAO. Under optimum conditions the productivity reaches 388 kg/mol catalyst/h/bar with DEAC whereas for MAO this value was 119 kg/mol catalyst/h/bar. Complex 3 displays good ethylene conversions of up to a maximum of 90\% with exceptionally high alpha-selectivity for 1-butene (\&gt;99.5\%) amongst C-4 products. Computational studies using density functional theory (DFT) were also carried out to ascertain the decomposition pathway for 3 as well as that for Ni(II) complex of the pyridine ketoxime ligand 2. The results suggest that loss of one of the two bidentate oxime ligands attached to the metal center through reaction with DEAC is likely for both 2 and 3. Further, calculations indicate that the subsequent decomposition step was significantly more probable for 3 than for 2 thus explaining why the pyridine ketoxime ligand bound nickel complex 2 was experimentally found to be more stable than the thiophene aldoxime bound nickel complex 3. Calculations also show that the proton of the -OH group (oxime) plays a major role in the stability of the molecules. This was confirmed experimentally by synthesizing the Ni(II) dichloro complex of Pyridine-2-carbaldehyde O-methyloxime 5 and reacting it with ethylene under similar conditions. 5 was found to be highly active even at low co-catalyst concentrations. (c) 2012 Elsevier B.V. All rights reserved.</p>},
	keywords = {Butene-1, Ethylene dimerization, Ni(II) complex, Thiophene aldoxime},
	issn = {1381-1169},
	doi = {10.1016/j.molcata.2012.09.029},
	author = {Tayade, Kamlesh N. and Mane, Manoj V. and Sen, Suman and Murthy, C. N. and Tembe, Gopal L. and Pillai, S. Muthukumaru and Vanka, Kumar and Mukherjee, Soumen}
}
