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Hafnium Trifluoromethanesulfonate (Hafnium Triflate) as a Highly Efficient Catalyst for Chemoselective Thioacetalization and Transthioacetalization of Carbonyl Compounds

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Atmospheric aerosols are one of the least understood components of the climate system and incur adverse health effects on susceptible populations. Organic aerosols can make up as much as 80% of atmospheric aerosols (Lim and Turpin

Taylor & Francis2013

Catalytic Enantiospecific [3+2] Annulation of Aminocyclopropanes with Ketones

Jérôme Waser, Fides Benfatti, Florian Patrick Marie Daniel De la Barre De Nanteuil

The first enantiospecific [3+2] annulation of D-A amino-cyclopropanes with ketones is reported herein (see scheme; Phth = phthaloyl). The reaction is catalyzed by 5 mol % of tin(IV) chloride at -78 °C and gives aminotetra-hydrofurans bearing a C5-quaternar ...

2012

New Acetylene Chemistry

Davinia Fernández González

This thesis is divided in seven main chapters including an introduction about the state of the art in the field, four main chapters describing the main part of the work, a short insight on the implications of the presented results for other research projec ...

EPFL2011

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An improved synthesis of pincer ligand bis[(2-dimethylamino)phenyl]amine (MeN2NH) was reported. Reaction of the Li complex of MeN2N with suitable Pd, Pt, and Ru precursors gave the corresponding metal complexes. The structures of the Pd, Pt, and Ru complex ...

Royal Society of Chemistry2011

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An oxidative stress (OS) state is characterized by the generation of Reactive Oxygen Species (ROS) in a biological system above its capacity to counterbalance them [1]. Exposure to OS induces the accumulation of intracellular ROS, which in turn causes cell ...

Elsevier2010

The combination of o-iodoxybenzoic acid (IBX) and tetrabutylammonium bromide (TBAB) efficiently oxidizes primary amines to the corresponding nitriles in good to excellent yield under mild conditions. The reaction is racemization-free when applied to a chir ...

2009

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Side-chain carboxyl and carbonyl groups play a major role in protein interactions and enzyme catalysis. A series of C-13 relaxation experiments is introduced to study the dynamics of carboxyl and carbonyl groups in protein side chains on both fast (sub-ns) ...

American Chemical Society2008

The present invention concerns an intermediate of the following formula I in which R 1 and R 2 represent independently of each other a C 1 -C 12 alkyl group, a (C 1 -C 12 alkoxy)carbonyl group, optionally substituted by one, two or three halogen atom, a (C ...

2007

Chiral BINOL phosphorochloridites were esterified and amidated with enantiopure 6-hydroxytropinone [6-hydroxy-8-azabicyclo[3.2.1]octan-3-one] cyclic acetal to yield chiral bidentate and monodentate phosphite-phosphoramidite ligands for copper-catalyzed asy ...

American Chemical Society2006

Enantiomerically pure (-)-(1R,4R,5R,6S)- and (+)-(1S,4S,5S,6R)-7-(tert-butoxycarbonyl)-5,6-exo-isopropylidenedioxy-7- azabicyclo[2.2.1]hept-2-one ((-)-3 and (+)-3) have been obtained from the Diels-Alder adduct of N-(tert-butoxycarbonyl)pyrrole and 2-bromo ...

2004