Vinyl polymerizations of norbornene catalyzed by nickel complexes with acetoacetamide ligands

Abstract

dOn the basis of a remote effect, a series of acetoacetamide ligands and corresponding nickel complexes N-(R-phenyl) acetoacetamide Ni(CH 2 Ph) (PMe 3 ) (R = H, 1; R = 2-methyl, 2; R = 2,6-dimethyl, 3; R = 2,6-diisopropyl, 4; R = 4-NO 2 , 5) were synthesized and characterized. The solid structure of complex 3 was confirmed by X-ray single-crystal analysis to be of cis form.1 H and 31 P NMR spectroscopy confirmed that cis and trans isomers of nickel complexes were present in solution. Norbornene polymerizations with acetoacetamide nickel complexes activated with modified methylaluminoxane (MMAO) were investigated in detail. Remote steric and electronic effects of acetoacetamide ligand on catalytic activity and molecular weight of polynorbornenes (PNBs) were observed. Characterizations of the obtained PNBs show that the obtained polymer products are non-crystalline vinylic-addition polynorbornenes.

5‐Ethylidene‐2‐norbornene Polymerization by α‐Diimine Nickel Catalyst: A Revealing Insight into the Pivotal Function of Binuclear and Mononuclear Catalyst Structure in Tailoring Polymer Architecture

“…For both samples, the presence of the peak in the region of 29-56 ppm in the 13 CNMR spectra of PENB points out additional polymerization. [36,37] The ethylidene carbon peak (Scheme 3) has been reported at 140-150 ppm for C5 and 110-120 ppm for C8 and the peak at 97 ppm is attributed to carbon tetrachloride that is used as a solvent. [21,38] The 13 CNMR spectra of synthesized PENB in this study are partially different from other NMR spectra of PENBs synthesized via addition polymerization.…”

Synthesis, molecular docking, DFT study, and in vitro antimicrobial activity of some 4‐(biphenyl‐4‐yl)‐1,4‐dihydropyridine and 4‐(biphenyl‐4‐yl)pyridine derivatives

“…The active methylene compounds II to X were prepared according to the methods mentioned in the literature. [ 25–28 ] Detail of substitutions of synthesized compounds ( 1a‐1i and 2a‐2i ) is provided in Table 1. For –C–H– stretching of a methyl group, >C═O stretching, and >C═C stretching of an aromatic ring, the IR spectra of compound 1a showed various stretching vibrations at 2947, 1736, and 1489 cm −1 , respectively.…”

Furnishing Amine-Functionalized Metal–Organic Frameworks with the β-Amidoketone Group by Postsynthetic Modification

“…The reaction yields β-amidoketones in a facile, high-yielding and atom-economical fashion. This reaction is of further significance owing to the noncarcinogenic nature of diketene, the known metal-chelating ability of the resulting β-amidoketone group, and the prevalence of solid-state ordering observed in many of the resulting PSM products, allowing direct crystallographic characterization for multiple modified MOFs. Aminated MOFs have previously been reacted with maleic anhydride and glyoxal, but in those cases, the resulting functionalities were less ordered …”