A highly efficient catalytic protocol for the isomerization of substituted amide-derived olefins is presented that successfully uses a hydride palladium catalyst system generated from [PdCl(2)(PPh(3))(2)] and HSi(OEt)(3). The Z to E isomerization was carried out smoothly and resulted in geometrically pure substituted olefins. Apart from the cis-trans isomerization of double bonds, the selective reduction of terminal olefins and activated alkenes was performed with excellent functional group tolerance in the presence of an amide-derived olefin ligand, and the products were obtained in high isolated yields (up to >99 %). Furthermore, the palladium/hydrosilane system was able to promote the reductive decarbonylation of benzoyl chloride when a (Z)-olefin with an aromatic amide moiety was used as a ligand.
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http://dx.doi.org/10.1002/chem.201200039 | DOI Listing |
J Am Chem Soc
January 2025
The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
Ni-catalyzed asymmetric reductive cross-coupling reactions provide rapid and modular access to enantioenriched building blocks from simple electrophile precursors. Reductive coupling reactions that can diverge through a common organometallic intermediate to two distinct families of enantioenriched products are particularly versatile but underdeveloped. Here, we describe the development of a bis(oxazoline) ligand that enables the desymmetrization of -anhydrides.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Département de chimie, Université de Montréal, Montréal, Québec, Canada, H3C 3J7.
Compounds featuring bonds between mercury and transition metals are of interest for their intriguing/ambiguous bonding and scarcely explored reactivities. We report herein the synthesis and reactivities of the new compound [(POCOP)Ni]Hg, [NiHg], featuring a trinuclear Ni-Hg-Ni core (POCOP=κ,κ,κ-2,6-(i-PrPO)CH). [NiHg] reacts with CO to give the carbonate-bridged complex [NiCO].
View Article and Find Full Text PDFDalton Trans
January 2025
Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany.
Chem Commun (Camb)
October 2024
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.
Density functional theory calculations uncovered a new mechanism for the rhodium-catalyzed decarbonylative annulation of isatoic anhydride with alkynes, in which the acyloxy group formed from the N-H deprotonation and C-O bond cleavage of isatoic anhydride acts as the directing group to assist the C-H activation. From the generated five-membered rhodacycle intermediate, the final aminoisocoumarin product could be formed by subsequent steps of alkyne insertion, reductive elimination, decarbonylation, and protonation. The isocyanate moiety contained in the annulation intermediate was uncovered as a novel internal oxidant for the reaction, which oxidizes the Rh(I) to Rh(III) by decarbonylation.
View Article and Find Full Text PDFRSC Adv
October 2024
Department of Chemistry, Marquette University Milwaukee Wisconsin 53201-1881 USA
A series of rhenium and manganese carbonyl complexes of a heteroscorpionate ligand with an atypical NP-donor set has been prepared to better understand their electronic and CO releasing properties. Thus, the ligand, pzTTP, with an ,-bis(pyrazol-1-yl)tolyl group decorated with an -situated di(-tolyl)phosphanyl reacts with carbonyl group 17 reagents to give [-(κNP-pzTTP)Re(CO)Br], 1, and [-(κNP-pzTTP)M(CO)](OTf = OSCF), 2-M (M = Re, Mn), if care is taken during the preparation of the manganeses derivative. When heated in CHCN, 2-Mn slowly transforms to [,-(κNP-pzTTP)Mn(CO)(NCCH)](OTf), 3-Mn.
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