Výsledky vyhledávání - "Steven H. Bertz"

Complexes of the Gilman Reagent with Double Bonds across the π–σ Continuum

Autor: Andy A. Thomas, Stephen K. Cope, Tara N. Whaley, Richard A. Hardin, Craig A. Ogle, David T. Smith, Steven H. Bertz, Michael D. Murphy

Publikováno v: Organometallics. 31:7827-7838

By using rapid injection NMR at low temperatures, a variety of π-complexes of lithium dimethylcuprate(I) with C–C, C–N, and C–S double bonds have been prepared and characterized. Complexation is generally accompanied by large upfield changes i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48c779d3f05c7fbb7ee86f4dc2df21ae
https://doi.org/10.1021/om300622c

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Rapid Injection NMR Reveals η3 ‘π-Allyl’ CuIII Intermediates in Addition Reactions of Organocuprate Reagents

Autor: Steven H. Bertz, Michael D. Murphy, Richard A. Hardin, Andy A. Thomas, Craig A. Ogle, Joshua D. Richter

Publikováno v: Journal of the American Chemical Society. 134:9557-9560

By using rapid injection NMR, it has now been possible to prepare and characterize the η(3) 'π-allyl' copper(III) intermediate that has been proposed for addition reactions of organocopper(I) reagents and α,β-unsaturated carbonyl compounds.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d0126acfa4497a7619cf5e7c52d6c04
https://doi.org/10.1021/ja3022363

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Minimization of Organocuprate Complexity through Self-Organization: Remarkable Orientation Effect in Mixed Cuprate π Complexes

Autor: Joshua D. Richter, Craig A. Ogle, Steven H. Bertz, Michael D. Murphy, Andy A. Thomas, Richard A. Hardin

Publikováno v: Angewandte Chemie International Edition. 51:2681-2685

They "know" where to go: a powerful orientation effect has been observed in complexes of mixed organocuprates [R(T)R(NT)CuLi] and substrates with C-C, C-N, and C-S double bonds (see scheme; Th=thienyl). The preferred geometry of the intermediate comp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::819c7be17330d780824c1db716c8a642
https://doi.org/10.1002/anie.201107060

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The X-ray Crystal Structure of a Cuprate-Carbonyl π-Complex

Autor: Steven H. Bertz, Thomas J. Heavey, Richard A. Hardin, Craig A. Ogle

Publikováno v: Angewandte Chemie International Edition. 52:10250-10252

Complexes between copper reagents and double-bonds have been proposed as intermediates in a number of synthetically important reactions. Many h-complexes between organocuprates and carbon–carbon double-bonds, which are intermediates in 1,4-addition

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a127735a92ae87cd8c72ac7b50478583
https://doi.org/10.1002/anie.201303783

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Aldehydes and Ketones Form Intermediate π Complexes with the Gilman Reagent, Me2CuLi, at Low Temperatures in Tetrahydrofuran

Autor: Steven H. Bertz, Craig A. Ogle, Richard A. Hardin

Publikováno v: Journal of the American Chemical Society. 135:9656-9658

Typical aldehydes and ketones form π complexes with Me2CuLi at low temperatures in tetrahydrofuran. They range in stability from fleeting intermediates at -100 °C to entities that persist up to -20 °C. Three subsequent reaction pathways have been

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4c3527898371ecca5c5bf02e9deb44d
https://doi.org/10.1021/ja404105u

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Simplification in Synthesis

Autor: Gerta Rücker, Steven H. Bertz, Toby J. Sommer, Christoph Rücker

Publikováno v: European Journal of Organic Chemistry. 2003:4737-4740

Mathematics Applied to Synthetic Analysis (MASA) is a useful addition to Logic and Heuristics Applied to Synthetic Analysis (LHASA), as it can be used to calculate the simplification afforded by alternative disconnections of a target molecule. One-bo

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https://doi.org/10.1002/ejoc.200300558

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Complexity of synthetic routes: Linear, convergent and reflexive syntheses1Electronic supplementary information (ESI) available: values of indices used to calculate analytical functions for routes 1–3. See http://www.rsc.org/suppdata/nj/b2/b210844p

Autor: Steven H. Bertz

Publikováno v: New Journal of Chemistry. 27:870-879

Complexity and diversity indices can be used to evaluate the structural changes that take place during the course of a synthesis. From the generalized ‘complexity versus step’ plot and the definition of the ‘ideal synthesis’ we derive the con

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c4471562b650fc18d70877807c369fa9
https://doi.org/10.1039/b210844p

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Complexity of synthetic reactions. The use of complexity indices to evaluate reactions, transforms and disconnections1Electronic supplementary information (ESI) available: a Prolegomenon to chemical graph theory; Table 13 and Figure 1, summarizing all possible disconnections of azacyclohexane 28. See http://www.rsc.org/suppdata/nj/b2/b210843g

Autor: Steven H. Bertz

Publikováno v: New Journal of Chemistry. 27:860-869

Complexity and diversity indices based on fundamental mathematical entities (topological invariants) are used to calculate the changes that take place during synthetic reactions, such as the Aldol, Diels–Alder, Wittig, Reppe–Vollhardt, Pauson–K

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91bb083f3aa0a5483bb242da8fa29e70
https://doi.org/10.1039/b210843g

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Ligand Exchange in Mixed Organocuprate(I) π-Complexes

Autor: Steven H. Bertz, Michael D. Murphy, Andy A. Thomas, Craig A. Ogle, Kelsey L. Browder, Richard A. Hardin

Publikováno v: Organometallics. 31:7809-7811

π-Complexes of mixed organocuprate(I) reagents with α,β-unsaturated carbonyl compounds can undergo ligand exchange to give the corresponding homocuprate–olefin π-complexes. The mechanism of this metathesis, which has profound implications for s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e87e152678a1c7f7e6d9bee02ecc3618
https://doi.org/10.1021/om3006646

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