Holtrichter-Roessmann, Thorsten; Haeger, Ina; Daniliuc, Constantin-Gabriel; Froehlich, Roland; Bergander, Klaus; Troll, Carsten; Rieger, Bernhard; Rojas, Rene S.; Wuerthwein, Ernst-Ulrich published an article about the compound: Picolinoyl chloride hydrochloride( cas:39901-94-5,SMILESS:O=C(Cl)C1=NC=CC=C1.[H]Cl ).Synthetic Route of C6H5Cl2NO. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:39901-94-5) through the article.
Three novel N-acylamidines 1a-c with varying steric bulk and substitution patterns were synthesized and thoroughly characterized by X-ray diffraction. N-Acylamidines RNHCpy:NCOpy (1a, 1b, py = 2-pyridyl, R = 1-adamantyl, Ph), which contain two addnl. binding sites located at two pyridine substituents, were treated with equimolar amounts of cyclopentadienylzirconium(IV) trichloride at room temperature The X-ray data of the resulting coordination compounds 7a and 7b indicate the formation of five-membered metallacycles with one of the pyridine nitrogen atoms and the carbonyl oxygen atom acting as binding sites. For the complexation of ligand PhCON:CPhNHAr (1c, Ar = 2,6-Me2C6H3) a different route was chosen: 1c was first deprotonated to yield the polymeric potassium compound (8) with a very complex substitution pattern based on O , N, and aromatic interactions with the potassium ions. Transmetalation of 8 with cyclopentadienylzirconium(IV) trichloride gave amidinate complex 9, which is dimeric in the solid state but exists in solution in equilibrium with monomeric species. After addition of methylaluminoxane (MAO), the three novel cyclopentadienylzirconium complexes 7a, 7b, and 9 gave active homogeneous single-site catalysts for the polymerization of ethylene. Of these three systems, 9/MAO turned out to be the most efficient one, showing activities 3-5 times higher than 7a/MAO and 7b/MAO, resp., and producing polymers with a well-defined “”monomodal”” mol. weight distribution. An important feature of these materials is their broader distribution in mol. weight (PDI > 3), which is best seen in the products of reactions at 53°, with a “”monomodal”” main fraction at higher mol. weight and only small fractions of low mol. weight
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