A "totally catalytic" nickel(0)-mediated method for base-free direct alkylation of allyl alcohols and allyl amines is reported. The reaction is selective for monoallylation, uses an inexpensive Ni precatalyst system, and requires no activating reagents to be present.
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http://dx.doi.org/10.1002/chem.201801241 | DOI Listing |
RSC Adv
January 2025
School of Chemistry and Chemical Engineering, Yan'an University Yan'an 716000 P.R. China
Pyrazoles are an important class of five-membered nitrogen heterocyclic compounds that have been widely used in agriculture and medicine. Exploring their synthesis methods under mild conditions has always been a hot research topic. Herein, a new strategy was developed to enhance the activity of a zirconium metal centre for the synthesis of -acylpyrazole derivatives using CpZrCl as a pre-catalyst.
View Article and Find Full Text PDFACS Omega
January 2025
Unit of Excellence in Computational Molecular Science and Catalysis, and Division of Chemistry, School of Science, University of Phayao, Phayao 56000, Thailand.
The effectiveness of metallocene catalysts in the cationic ring-opening polymerization (cationic ROP) of ε-caprolactone (CL) is influenced by the choice of metallocene/borate systems, particularly their bulkiness. Recent research examines this effect on the initiation and propagation stages of cationic ROP. We conducted a density functional theory study on the precatalyst activation of cationic CL ROP by zirconocene/borate catalysts, where four models of zirconocene precatalysts (CpZrMe (), (MeCp)CpZrMe (), (MeCp)ZrMe (), and IndZrMe ()) were combined with boron cocatalysts B(CF) and [X][B(CF) ] (X = PhC or PhMeNH).
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States.
Under most conditions, 2,4-dihalopyrimidines undergo substitution reactions at C4. Here we report that Pd(II) precatalysts supported by bulky -heterocyclic carbene ligands uniquely effect C2-selective cross-coupling of 2,4-dichloropyrimidine with thiols. The regioselectivity of this reaction stands in stark contrast to ∼1500 previously reported Pd-catalyzed cross-couplings that favor C4 in the absence of other substituents on the pyrimidine ring.
View Article and Find Full Text PDFChemistry
January 2025
Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, 119991, Moscow, RUSSIAN FEDERATION.
Palladium catalysts form a cornerstone of modern chemistry with upmost scientific and industrial impact. Bulk palladium metal itself is chemically inert, and a sequence of chemical transformations has to be utilized to convert the metal into Pd pre-catalyst covered by ligands. However, the "cocktail" of catalysis concept discovered recently has shown that Pd systems can efficiently operate in catalysis without the necessity of a complicated and expensive pre-installed ligand environment.
View Article and Find Full Text PDFPolymers (Basel)
December 2024
Department of Chemical Sciences, Federico II University of Naples, via Cinthia, 80126 Napoli, Italy.
Group 4 metallocenes are competent catalysts for the oligomerization of higher α-olefins. Among the many chemical and physical variables of importance in the process, one is the choice of cocatalyst (activator). The impact of various activators on the performance of a representative catalyst, (nBuCp)ZrCl, in the oligomerization of 1-octene was thoroughly investigated; in particular, the molecular weight distribution (MWD) of the oligomers was determined by means of high-resolution high performance liquid chromatography (HR-HPLC).
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