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8 results on '"Jørn H. Hansen"'

1. ChemInform Abstract: Scope and Mechanistic Analysis of the Enantioselective Synthesis of Allenes by Rhodium-Catalyzed Tandem Ylide Formation/[2,3]-Sigmatropic Rearrangement Between Donor/Acceptor Carbenoids and Propargylic Alcohols

Author

Djamaladdin G. Musaev, Huw M. L. Davies, Zhanjie Li, Jochen Autschbach, Jørn H. Hansen, and Vyacheslav Boyarskikh

Subjects
chemistry.chemical_classification, Tandem, Chemistry, Ylide, 2,3-sigmatropic rearrangement, Yield (chemistry), Enantioselective synthesis, chemistry.chemical_element, General Medicine, Oxonium ion, Medicinal chemistry, Catalysis, Rhodium
Abstract

Reaction of carbenoids with propargylic alcohols results in tandem oxonium ylide formation/[2,3]-sigmatropic rearrangement to yield allenes with high enantioselectivity.

Published
2013

2. ChemInform Abstract: Metal-Free N-H Insertions of Donor/Acceptor Carbenes

Author

Stephanie R. Hansen, Huw M. L. Davies, Jillian E. Spangler, and Jørn H. Hansen

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Range (particle radiation), Primary (chemistry), chemistry, Metal free, Aryl, Polymer chemistry, Thermal decomposition, General Medicine, Donor acceptor, Alkyl
Abstract

The thermal decomposition of aryldiazoacetates generates carbenes, which directly undergo the C—H insertion reactions with a wide range of primary and secondary alkyl- and aryl/heteroarylamines to give α-arylamino esters in good yields.

Published
2012

3. ChemInform Abstract: D2-Symmetric Dirhodium Catalyst Derived from a 1,2,2-Triarylcyclopropanecarboxylate Ligand: Design, Synthesis and Application

Author

Kenneth I. Hardcastle, Vyacheslav Boyarskikh, Huw M. L. Davies, Djamaladdin G. Musaev, Changming Qin, and Jørn H. Hansen

Subjects
Tandem, Cyclopropanation, Chemistry, Ligand, Enantioselective synthesis, chemistry.chemical_element, Surface modification, General Medicine, Combinatorial chemistry, Cope rearrangement, Rhodium, Catalysis
Abstract

The new rhodium catalyst (I) is prepared and highly enantioselective cyclopropanations, tandem cyclopropanation/Cope rearrangements and a combined C—H functionalization/Cope rearrangement are achieved using this catalyst.

Published
2012

4. ChemInform Abstract: Thermally Induced Cycloadditions of Donor/Acceptor Carbenes

Author

Jørn H. Hansen, Huw M. L. Davies, and Stephanie R. Ovalles

Subjects
Chemistry, General Medicine, Donor acceptor, Photochemistry
Abstract

Many reactions proceed in higher yields than the previously described rhodium-catalyzed ones, but only electron-rich substituents cause high diastereoselectivities.

Published
2011

7. ChemInform Abstract: Highly Enantioselective Rh2(S-DOSP)4-Catalyzed Cyclopropenation of Alkynes with Styryldiazoacetates

Author

Huw M. L. Davies, John F. Briones, Kenneth I. Hardcastle, Jochen Autschbach, and Jørn H. Hansen

Subjects
Chemistry, Stereochemistry, Enantioselective synthesis, General Medicine, Catalysis, Stereocenter
Abstract

Arylvinyldiazoacetates smoothly undergo highly enantioselective Rh-catalyzed cyclopropenation reaction with terminal alkynes to give stable enantioenriched vinylcyclopropenes with quaternary stereocenter, e.g. (III) and (VI).

Published
2011

8. ChemInform Abstract: Solvent-Free Catalytic Enantioselective C-C Bond Forming Reactions with Very High Catalyst Turnover Numbers

Author

Jørn H. Hansen, Philip Pelphrey, and Huw M. L. Davies

Subjects
Solvent free, chemistry, Bond, Polymer chemistry, Enantioselective synthesis, chemistry.chemical_element, General Medicine, Ton, Bond formation, Carbenoid, Catalysis, Rhodium
Abstract

A combination of donor—acceptor-substituted rhodium carbenoid catalysts with solvent-free reaction conditions is used to significantly enhance the turnover numbers (TON) in Rh-catalyzed C—C bond formation reactions.

Published
2010

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