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Soc."},{"key":"ref14\/cit14","unstructured":"The 2D NMR analysis of complex [(N,O)NiMe(tmeda)] in DMSO-d6showed that tmeda can bind to the nickel center in a chelating \u03ba2-fashion, with the salicylaldiminato ligand coordinated solely via its phenoxy oxygen atom in a \u03ba1-fashion. Complexes involving \u03ba1-tmeda also occur, but their formation is less favored. In DMSO-d6solution, the \u03ba2-tmeda complex forms an equilibrium with the corresponding solvent complex and free tmeda. Key1H (13C) NMR resonances of the \u03ba2-tmeda complex: \u22121.79 (\u221215.0) (Ni(II)\u2212CH3), 1.64 (45.9), 1.82 (47.5), 2.01 (48.6), 2.35 (45.9) (4 \u00d7 N\u2212CH3, tmeda), 11.09 (160.9) (\u2212CH\u2550N\u2212) ppm."},{"key":"ref15\/cit15","unstructured":"Rapid ethylene consumption was observed in toluene-d8and CD2Cl2solutions of1-DMSOat ambient temperatures. No defined resonances of higher (R > Me) Ni(II)\u2212alkyls could be detected besides the gradual ingrowth of a broad polymer or polymeryl resonance at 2.03 ppm. Although the rate of ethylene consumption could be lowered by decreasing the reaction temperature, no defined higher Ni(II)\u2212alkyl species were observed at temperatures down to 0\u00b0C either. Because of their poor miscibility with water, in particular at lower temperatures, toluene and methylene chloride are not suitable for studying the influence of water on the polymerization-active Ni(II)\u2212alkyl species under chain-growth conditions."},{"key":"ref16\/cit16","doi-asserted-by":"crossref","first-page":"2272","DOI":"10.1039\/b306701g","author":"Connor E. F.","year":"2003","journal-title":"Chem. Commun."},{"key":"ref17\/cit17","unstructured":"Notably, rates of exchange of free and coordinated DMSO depend on the concentration of free DMSO, suggesting an associative mechanism. Second-order rate constants and activation parameters were determined for both isomers by variable-temperature1H NMR:kexch,DMSO,cis= 1.0 \u00d7 104M\u22121s\u22121andkexch,DMSO,trans= 1.1 \u00d7 104M\u22121s\u22121at 25\u00b0C (as determined by linear regression of Eyring plots; see theSupporting Information). A van\u2019t Hoff analysis of the equilibrium constant between the cis and trans isomers (as determined by variable-temperature1H NMR spectroscopy) over the temperature range from \u221260 to 45\u00b0C yielded \u0394H= (7.98 \u00b1 0.09) kJ mol\u22121and \u0394S= (21 \u00b1 1) J mol\u22121K\u22121(see theSupporting Information). The difference in the free energies of the two isomers was determined to be \u0394G= (1.71 \u00b1 0.31) kJ mol\u22121at room temperature."},{"key":"ref18\/cit18","unstructured":"Surprisingly, the apparent overall activities increased upon the addition of small excesses of DMSO to the catalyst toluene solution. The TOFs were observed to increase from 4.5 \u00d7 104TO h\u22121in the absence of an excess to 8.0 \u00d7 104and 1.4 \u00d7 105TO h\u22121in the presence of 11 and 40 equiv of excess DMSO per Ni(II)\u2212methyl, respectively, under 30 bar of ethylene pressure. The polymer molecular weights also increased:Mnof the polyethylenes obtained were in the range (3.0\u22123.6) \u00d7 105g mol\u22121(Mw\/Mn= 2.5\u22122.7, 50% crystallinity) in the presence of 40 equiv of excess DMSO as opposed to 1.4 \u00d7 105g mol\u22121in the absence of excess DMSO. Overall polymerization activities were constant with time. The presence of larger amounts of DMSO (\u2265 100 equiv) resulted in polymer precipitation at early reaction times, concomitant with a strong uncontrolled exotherm."},{"key":"ref19\/cit19","doi-asserted-by":"crossref","first-page":"7806","DOI":"10.1021\/ic050501r","volume":"44","author":"Hristov I. H.","year":"2005","journal-title":"Inorg. Chem."},{"key":"ref20\/cit20","unstructured":"1-DMSOreadily dissolves in methanol-d4.1H and13C NMR spectra reveal single defined Ni(II)\u2212CH3resonances at \u22121.28 and \u221214.0 ppm, respectively, and signals for DMSO-h6at 2.67 and 40.4 ppm, respectively (complete1H and13C assignments are provided in theSupporting Information). However, the resonances could not be assigned unambiguously to a DMSO- or methanol-coordinated Ni(II)\u2212methyl species. Rapid ligand exchange between methanol and DMSO complexes, which presumably exist in equilibrium with each other, may result in an averaged Ni(II)\u2212CH3NMR signal. 2D ROESY spectra revealed no dipolar couplings between Ni(II)\u2212CH3and DMSO protons; a rapid ligand exchange may prevent sufficient magnetization transfer. However, gradual formation of CH3D was observed at 40\u00b0C, and a first-order rate constant was determined askobs,CD3OD(313 K) = (4.2 \u00b1 0.1) \u00d7 10\u22124s\u22121by monitoring the disapperance of the Ni(II)\u2212CH3resonance with time (see theSupporting Information)."},{"key":"ref21\/cit21","unstructured":"1H and13C NMR spectra revealed that a higher concentration of hexenes was formed under conditions of bubbling ethylene through the reaction solution than under the NMR tube reaction conditions. No reaction products resulting from an ethylene insertion into a secondary Ni(II)\u2212alkyl species were detected."},{"key":"ref22\/cit22","unstructured":"The rate of cis\u2212trans isomerization was estimated from the1H NMR spectra of2-DMSO. The rate of isomerization is larger than the4JH\u2212Hcoupling frequency of protons H4 and H6 (which are therefore unresolved) but smaller than the3JH-Hcoupling frequency of the \u03b1- and \u03b2-protons of the Ni(II)\u2212ethyl fragment (which are therefore resolved). See theSupporting Information."},{"key":"ref23\/cit23","doi-asserted-by":"crossref","first-page":"4073","DOI":"10.1021\/ja00793a055","volume":"95","author":"Yamamoto A.","year":"1973","journal-title":"J. Am. Chem. Soc."},{"key":"ref24\/cit24","unstructured":"This temperature interval was chosen because the rates of the reaction are in a reasonable range for accurate determination."},{"key":"ref25\/cit25a","doi-asserted-by":"crossref","first-page":"4948","DOI":"10.1021\/ja00535a020","volume":"102","author":"Bryndza H. E.","year":"1980","journal-title":"J. Am. Chem. Soc."},{"key":"ref25\/cit25b","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1021\/om00133a007","volume":"5","author":"Collman J. P.","year":"1986","journal-title":"Organometallics"},{"key":"ref26\/cit26a","doi-asserted-by":"crossref","first-page":"2144","DOI":"10.1021\/om00141a036","volume":"5","author":"Ozawa F.","year":"1986","journal-title":"Organometallics"},{"key":"ref26\/cit26b","doi-asserted-by":"crossref","first-page":"4097","DOI":"10.1021\/om060409i","volume":"25","author":"Goj L. A.","year":"2006","journal-title":"Organometallics"},{"key":"ref27\/cit27a","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1021\/ar50136a005","volume":"12","author":"Norton J. R.","year":"1979","journal-title":"Acc. Chem. Res."},{"key":"ref27\/cit27b","doi-asserted-by":"crossref","first-page":"4415","DOI":"10.1021\/ja00405a022","volume":"103","author":"Jones W. D.","year":"1981","journal-title":"J. Am. Chem. Soc."},{"key":"ref27\/cit27c","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1021\/om00120a007","volume":"4","author":"Nappa M. J.","year":"1985","journal-title":"Organometallics"},{"key":"ref27\/cit27d","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1021\/ja00261a008","volume":"108","author":"Martin B. D.","year":"1986","journal-title":"J. Am. Chem. Soc."},{"key":"ref27\/cit27e","doi-asserted-by":"crossref","first-page":"13327","DOI":"10.1021\/ja073339v","volume":"129","author":"Li C.","year":"2007","journal-title":"J. Am. Chem. Soc."},{"key":"ref28\/cit28","unstructured":"In the context of the apparently neglible tendencies for bimolecular homocoupling of higher Ni(II)\u2212alkyls, it is interesting to take note of the studies on alkyl exchange reactions reported in ref25b.Facilealkyl exchange between Rh(I)\u2212alkyls was limited to methyl and benzyl fragments, whereas higher alkyls, either primary or secondary, did not undergo any observable exchange. If it is assumed that the mechanisms for alkyl exchange and intermolecular elimination reactions are similar, the preference for alkyl homocoupling observed by us would appear to reflect the distinct reactivity of the Ni(II)\u2212methyl catalyst precursor compared with that of higher Ni(II)\u2212alkyls."},{"key":"ref29\/cit29","doi-asserted-by":"crossref","first-page":"2342","DOI":"10.3891\/acta.chem.scand.23-2342","volume":"23","author":"Dahl O.","year":"1969","journal-title":"Acta Chem. Scand."}],"container-title":["Journal of the American Chemical Society"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/ja808855v","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,3,14]],"date-time":"2023-03-14T01:55:25Z","timestamp":1678758925000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/doi\/10.1021\/ja808855v"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,1,12]]},"references-count":83,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2009,2,4]]}},"alternative-id":["10.1021\/ja808855v"],"URL":"https:\/\/doi.org\/10.1021\/ja808855v","relation":{},"ISSN":["0002-7863","1520-5126"],"issn-type":[{"value":"0002-7863","type":"print"},{"value":"1520-5126","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,1,12]]}}}