The author of 《Ti(IV) Complexes with Bidentate O-Chelating N-Heterocyclic Carbenes for Use in the Homopolymerization of Ethylene and Its Copolymerization with Cyclic Olefins》 were van der Ende, Melita; Hauser, Philipp M.; Lienert, Christina; Wang, Dongren; Frey, Wolfgang; Buchmeiser, Michael R.. And the article was published in ChemCatChem in 2019. Computed Properties of C4H5ClO3 The author mentioned the following in the article:
The synthesis of titanium (IV) complexes bearing bidentate O-chelating N-heterocyclic carbenes (NHCs) is reported. Double deprotonation of the resp. NHC precursor ligand and further reaction with one equivalent of TiCl4·THF2 leads to the formation of complexes Ti1-3 of the general formula TiCl3(NHC-R-O)(THF); (NHC-R-O = 1-(2,6-diisopropylphenyl)-3-(2-O-phenyl)-4,5-dihydroimidazol-2-ylidene, 1-(mesityl)-3-(2-O-phenyl)-4,5-dihydroimidazol-2-ylidene, 1-(2,6-dimethylphenyl)-3-(2-O-phenyl)-4,5-dihydroimidazol-2-ylidene). Furthermore, these Ti-(NHC-R-O) trichloride complexes can be reacted with the bulky aryloxo ligands 2,6-ditBu-4-methylphenolate and 2,2′,4,4′,6,6′-hexa-iPr-terphenoxide, resp., to form the mixed titanium (aryloxo)(NHC-R-O) dichloride pre-catalysts Ti4-6. Single-crystal X-ray structures of complexes Ti1, Ti5 and Ti6 are presented. Depending on the aryloxo ligand used, the complexes possess either a trigonal bipyramidal or square pyramidal ligand sphere. The propensity of Ti1, Ti4-6 to homopolymerize ethylene and to copolymerize ethylene with norborn-2-ene (NBE) and cyclopentene (CPE), resp., was investigated and access to high-mol. weight (co-)polymers with such complexes is disclosed. In addition to this study using Ethyl oxalyl monochloride, there are many other studies that have used Ethyl oxalyl monochloride(cas: 4755-77-5Computed Properties of C4H5ClO3) was used in this study.
Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.Computed Properties of C4H5ClO3
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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics