Hsien‐Cheng Yu

Heterobinuclear Molecular Precursors Direct the Formation of Supported Subnanometer Cu–M Clusters with Tunable Catalytic Behavior

Mazal Kostan-Carmiel, Hadar Shema, Hsien‐Cheng Yu, Griffin A. Canning et autres

Subnanometer bimetallic clusters hold great promise for catalytic applications due to their unique electronic properties and high surface-to-volume ratios. However, precise control over their composition and size remains a major challenge, particularly for immiscible metal pairs. Here, we report a surface-anchored molecular …

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sp-Hybridized Seesaw Ge0 Complexes via Germylone-to-Seesaw Isomerization in a Four-Electron Cyclic N2Ge2 Ligand

Cian‐Wei Yang, Gou‐Tao Huang, Yu‐Te Wey, F. Yang et autres

High Resolution Image Download MS PowerPoint Slide We report the first examples of two linear trigermanium complexes (μ-Ge)(κ 2 - N 2 Ge 2 Ar ) (Ar = 2,4,6-Me 3 C 6 H 2 ( 4 ), 2,6-Et 2 C 6 H …

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Synthesis and Characterization of Heteromultinuclear Ni/M Clusters (M = Fe, Ru, W) Including a Paramagnetic (NHC)Ni–WCp*(CO)3 Heterobinuclear Complex

Hsien‐Cheng Yu, Joshua Telser, Neal P. Mankad

A diverse range of heteromultinuclear Ni I /[M CO ] clusters (M CO = CpFe(CO) 2, CpRu(CO) 2, Cp*W(CO) 3 ) supported by an N-heterocyclic carbene ligand have been synthesized by reacting the Ni I precursor, [IPrNi(μ-Cl)] 2, with [M CO ] …

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Nitrone and Alkyne Cascade Reactions for Regio‐ and Diastereoselective 1‐Pyrroline Synthesis

Guanqun Zhang, Abdullah S. Alshreimi, Laura Alonso, Alan Antar et autres

Abstract The synthesis of 1‐pyrrolines from N‐alkenylnitrones and alkynes has been explored as a retrosynthetic alternative to traditional approaches. These cascade reactions are formal [4+1] cycloadditions that proceed through a proposed dipolar cycloaddition and N‐alkenylisoxazoline [3,3′]‐sigmatropic rearrangement. A variety of cyclic alkynes …

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Nitrone and Alkyne Cascade Reactions for Regio‐ and Diastereoselective 1‐Pyrroline Synthesis

Guanqun Zhang, Abdullah S. Alshreimi, Laura Alonso, Alan Antar et autres

The synthesis of 1-pyrrolines from N-alkenylnitrones and alkynes has been explored as a retrosynthetic alternative to traditional approaches. These cascade reactions are formal [4+1] cycloadditions that proceed through a proposed dipolar cycloaddition and N-alkenylisoxazoline [3,3']-sigmatropic rearrangement. A variety of cyclic alkynes and …

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Catalytic Reactions by Heterobimetallic Carbonyl Complexes with Polar Metal–Metal Interactions

Neal P. Mankad, Hsien‐Cheng Yu

Abstract Heterobinuclear catalysts capable of bimetallic cooperative bond activation provide an alternative pathway to approach the discovery of novel and unique reactivity and selectivity in catalytic transformations, complementing more traditional mononuclear precious metal catalysts. This review summarizes recent advances in homogenous catalysis …

Cooperative Heterobimetallic Substrate Activation Enhances Catalytic Activity and Amplifies Regioselectivity in 1,4-Hydroboration of Pyridines

Hsien‐Cheng Yu, Shahidul M. Islam, Neal P. Mankad

Regioselective 1,4-hydroboration of pyridine derivatives and quinoline with pinacolborane is catalyzed efficiently by the heterobinuclear catalyst, (IPr)CuFeCp(CO) 2, at only 2 mol % loading, providing access to valuable 1,4-dihydropyridine (1,4-DHP) products. A variety of reactive functional groups are tolerated in the pyridine …

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Pursuit of C–H Borylation Reactions with Non-Precious Heterobimetallic Catalysts: Hypothesis-Driven Variations on a Design Theme

Noel J. Leon, Hsien‐Cheng Yu, Thomas J. Mazzacano, Neal P. Mankad

This article presents a retrospective account of our group’s heterobinuclear (NHC)Cu-[MCO] catalyst design concept (NHC = N-heterocyclic carbene, [MCO] = metal carbonyl anion), the discovery of its application towards UV-light-induced dehydrogenative borylation of unactivated arenes, and the subsequent pursuit of thermal reaction …

Dynamically Bifurcating Hydride Transfer Mechanism and Origin of Inverse Isotope Effect for Heterodinuclear AgRu-Catalyzed Alkyne Semihydrogenation

Ying Zhang, Malkanthi K. Karunananda, Hsien‐Cheng Yu, Kyle J. Clark et autres

The mechanism and heterodinuclear cooperative effects for AgRu-catalyzed alkyne semihydrogenation were analyzed with density-functional theory (DFT) and experiment. This combined effort revealed the following: (1) AgRu-catalyzed diphenylacetylene hydrogenation initially gives a kinetic mixture of cis -stilbene and trans -stilbene by an ionic …

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Mixed phosphine/carbonyl derivatives of heterobimetallic copper–iron and copper–tungsten catalysts

Noel J. Leon, Hsien‐Cheng Yu, Thomas J. Mazzacano, Neal P. Mankad

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CCDC 1860135: Experimental Crystal Structure Determination

Noel J. Leon, Hsien‐Cheng Yu, Thomas J. Mazzacano, Neal P. Mankad

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

CCDC 1860133: Experimental Crystal Structure Determination

Noel J. Leon, Hsien‐Cheng Yu, Thomas J. Mazzacano, Neal P. Mankad

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …