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Showing 25 to 36 of 257 entries
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A new method for the conversion of allyl alcohol into pi-allyl species promoted by nucleophilic interaction with a CO ligand.

Chemical communications (Cambridge, England)

Dubs C, Yamamoto T, Inagaki A, Akita M.
PMID: 16767250
Chem Commun (Camb). 2006 May 14;(18):1962-4. doi: 10.1039/b601143h. Epub 2006 Mar 23.

Upon treatment with an iridium carbonyl complex, [(PN)Ir(CO)2]+, allyl alcohol can be smoothly converted into pi-allyliridium species at ambient temperature via nucleophilic interaction of the alcohol with a CO ligand followed by C(allyl)-O bond cleavage in the resultant protonated...

Novel hydrido-ruthenium(II) complexes with histidine derivatives and their application in the hydrogenation of ketones.

Dalton transactions (Cambridge, England : 2003)

Sui-Seng C, Hadzovic A, Lough AJ, Morris RH.
PMID: 17563789
Dalton Trans. 2007 Jun 28;(24):2536-41. doi: 10.1039/b702803b. Epub 2007 Apr 19.

The complexes RuHCl((R)-binap)(L-NH2) with L-NH2 = (S)-histidine-Me-ester (1), histamine (3), (S)-histidinol (4) or 1-Me-(S)-histidine-Me-ester (5), and RuHCl((S)-binap)(L-NH(2)) with L-NH2 = (S)-histidine-Me-ester (2) have been prepared in 60-81% overall yields in a one-pot, three-step procedure from the precursor RuCl2(PPh3)3. Their...

Properties of Allyl Alcohol-Resistant Mutants of Clostridium butyricum Grown on Glycerol.

Applied and environmental microbiology

Abbad-Andaloussi S, Amine J, Gerard P, Petitdemange E, Petitdemange H.
PMID: 16535411
Appl Environ Microbiol. 1996 Sep;62(9):3499-501. doi: 10.1128/aem.62.9.3499-3501.1996.

Mutants of Clostridium butyricum E5 exhibiting resistance to allyl alcohol which produced the same quantities of 1,3-propanediol as the wild-type strain but more acetate than butyrate were isolated. The acetate-butyrate formation plays a major function in the regulation of...

Tandem cyclopropanation with dibromomethane under Grignard conditions.

The Journal of organic chemistry

Brunner G, Eberhard L, Oetiker J, Schröder F.
PMID: 18783276
J Org Chem. 2008 Oct 03;73(19):7543-54. doi: 10.1021/jo8007397. Epub 2008 Sep 11.

Tertiary Grignard reagents and dibromomethane efficiently cyclopropanate allylic (and certain homoallylic) magnesium and lithium alcoholates at ambient temperature in ether solvents. Lithium (homo)allyl alcoholates are directly cyclopropanated with magnesium and CH2Br2 under Barbier conditions at higher temperatures. The reaction...

A review of new developments in the Friedel-Crafts alkylation - From green chemistry to asymmetric catalysis.

Beilstein journal of organic chemistry

Rueping M, Nachtsheim BJ.
PMID: 20485588
Beilstein J Org Chem. 2010 Jan 20;6:6. doi: 10.3762/bjoc.6.6.

The development of efficient Friedel-Crafts alkylations of arenes and heteroarenes using only catalytic amounts of a Lewis acid has gained much attention over the last decade. The new catalytic approaches described in this review are favoured over classical Friedel-Crafts...

Characterization of plasma polymerized C, H, and O containing compounds by MALDI mass spectrometry.

Langmuir : the ACS journal of surfaces and colloids

Peng L, Kinsel GR.
PMID: 20961059
Langmuir. 2010 Nov 16;26(22):17477-81. doi: 10.1021/la1027866. Epub 2010 Oct 20.

Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is used for the first time to characterize radio frequency plasma-deposited polymers and for investigation of the plasma polymerization process. The MALDI mass spectra of the plasma polymers of allyl alcohol, di(ethylene glycol)...

Cross metathesis of allyl alcohols: how to suppress and how to promote double bond isomerization.

Organic & biomolecular chemistry

Schmidt B, Hauke S.
PMID: 23676990
Org Biomol Chem. 2013 Jul 07;11(25):4194-206. doi: 10.1039/c3ob40167g.

Under standard conditions the cross metathesis of allyl alcohols and methyl acrylate is accompanied by the formation of ketones, resulting from uncontrolled and undesired double bond isomerization. By conducting the CM in the presence of phenol, the catalyst loading...

Controlling surface ligand density and core size of alkanethiolate-capped Pd nanoparticles and their effects on catalysis.

Langmuir : the ACS journal of surfaces and colloids

Gavia DJ, Shon YS.
PMID: 22924990
Langmuir. 2012 Oct 09;28(40):14502-8. doi: 10.1021/la302653u. Epub 2012 Sep 24.

This article presents systematic investigations on the relationship between the catalytic property and the surface ligand density/core size of thiolate ligand-capped Pd nanoparticles (PdNPs). The systematic variations in the two-phase synthesis of PdNPs generated from sodium S-dodecylthiosulfate were performed....

Isolated human and rabbit eye: Models of corneal toxicity.

Toxicology in vitro : an international journal published in association with BIBRA

Berry M, Easty DL.
PMID: 20732234
Toxicol In Vitro. 1993 Jul;7(4):461-4. doi: 10.1016/0887-2333(93)90047-9.

Human and rabbit isolated eyes were compared, not in order to propose yet another test, but to explore the boundaries of the rabbit isolated cornea as a model for primary damage to human cornea. Changes in corneal thickness and...

Chemoselective reduction of the carbonyl functionality through hydrosilylation: integrating click catalysis with hydrosilylation in one pot.

The Journal of organic chemistry

Roy SR, Sau SC, Mandal SK.
PMID: 25188382
J Org Chem. 2014 Oct 03;79(19):9150-60. doi: 10.1021/jo501505j. Epub 2014 Sep 19.

Herein we report the chemoselective reduction of the carbonyl functionality via hydrosilylation using a copper(I) catalyst bearing the abnormal N-heterocyclic carbene 1 with low (0.25 mol %) catalyst loading at ambient temperature in excellent yield within a very short...

Acid-Assisted Direct Olefin Metathesis of Unprotected Carbohydrates in Water.

Chemistry (Weinheim an der Bergstrasse, Germany)

Timmer BJJ, Ramström O.
PMID: 31390489
Chemistry. 2019 Nov 13;25(63):14408-14413. doi: 10.1002/chem.201903155. Epub 2019 Oct 15.

The ability to use unprotected carbohydrates in olefin metathesis reactions in aqueous media is demonstrated. By using water-soluble, amine-functionalized Hoveyda-Grubbs catalysts under mildly acidic aqueous conditions, the self-metathesis of unprotected alkene-functionalized α-d-manno- and α-d-galactopyranosides could be achieved through minimization...

1,3-Dioxa-[3,3]-sigmatropic Oxo-Rearrangement of Substituted Allylic Carbamates: Scope and Mechanistic Studies.

The Journal of organic chemistry

Agirre M, Henrion S, Rivilla I, Miranda JI, Cossío FP, Carboni B, Villalgordo JM, Carreaux F.
PMID: 30457341
J Org Chem. 2018 Dec 21;83(24):14861-14881. doi: 10.1021/acs.joc.8b01320. Epub 2018 Dec 04.

An unexpected 1,3-dioxa-[3,3]-sigmatropic rearrangement during the treatment of aryl- and alkenyl-substituted allylic alcohols with activated isocyanates is reported. The reorganization of bonds is highly dependent on the electron density of the aromatic ring and the nature of isocyanate used....

Showing 25 to 36 of 257 entries