Results 21 to 30 of about 25,253 (95)

Comparative study on the gas to solution phase solvation free energies of model combustion flue gas compounds (N~2~, O~2~, CO~2~, H~2~O, SO~2~, and CO) in 178 organic solvents using the IEFPCM-UFF, CPCM, and SMD implicit solvent models at the Gaussian-4 (G4) level of theory [PDF]

open access: yes, 2010
Gas to solution phase Gibbs free energies of solvation at 298.15 K for transfer of six representative combustion flue gas compounds (N~2~, O~2~, CO~2~, H~2~O, SO~2~, and CO) were calculated at the Gaussian-4 (G4) level of theory using the IEFPCM-UFF ...
Kaya Forest, Sierra Rayne
core   +2 more sources

Picosecond Laser Chemistry in Supersonic Jet Beams [PDF]

open access: yes, 1983
In this review we describe the development and the applications of the picosecond-jet technique, which utilizes a picosecond laser and a supersonically-cold jet beam of large molecules.
Zewail, Ahmed H.
core   +1 more source

Organocatalytic synthesis of axially chiral atropisomers [PDF]

open access: yes, 2017
This review summarises the recent progress made in the organocatalytic synthesis of atropisomeric compounds. Methodologies based on dynamic kinetic resolution and direct access to BINOL-like biaryls are described.
Renzi, P.
core   +1 more source

Dynamic Kinetic Resolution of Hetero biaryl Ketones by Zinc- Catalyzed Asymmetr ic Hydrosil ylation [PDF]

open access: yes, 2019
Adiastereo- and highly enantioselective dynamic kinetic resolution (DKR) of configurationally labile hetero- biaryl ketones is described. The DKR proceeds by zinc- catalyze dhydrosilylation of the carbonyl group ,thus leading to ...
Carmona, José A.   +6 more
core   +1 more source

Enzymatic formation of protopines by a microsomal cytochrome P-450 system of Corydalis vaginans [PDF]

open access: yes, 1987
A microsomal cytochrome P-450-NADPH dependent enzyme which hydroxylates stereo- and regiospecifically carbon atom 14 of (S)- -N- methyltetrahydroprotoberberines has been discovered in a number of plant cell cultures originating from species containing ...
Rüffer, Martina, Zenk, Meinhart H.
core   +1 more source

Supramolecular study, Hirshfeld analysis and theoretical study of 6-methoxyquinoline N-oxide dihydrate [PDF]

open access: yes, 2013
In the crystal structure of 6-methoxyquinoline N-oxide dihydrate, C10H9NO2 center dot 2H(2)O, (I), the presence of two-dimensional water networks is analysed.
Hernandez, Geraldine   +3 more
core   +1 more source

Natural aromatic compounds as scaffolds to develop selective G-quadruplex ligands. From previously reported berberine derivatives to new palmatine analogues [PDF]

open access: yes, 2018
In this paper, the selective interactions of synthetic derivatives of two natural compounds, berberine and palmatine,with DNA G-quadruplex structureswere reported.
Bianco, Armandodoriano   +11 more
core   +2 more sources

Synthesis and reactions of 1-amino-1,5,6,10b-tetrahydroimidazo[2,1-a]isoquinolin-2(3H)-ones [PDF]

open access: yes, 2008
1-Amino-1,5,6,10b-tetrahydroimidazo[2,1-a]isoquinolin-2(3H)-ones, as previously unknown ring-annelated isoquinolines with a 3-aminoimidazolidin-4-one scaffold, were selectively prepared upon reacting 2-carbamoylmethyl- or 2-ethoxycarbonylmethyl-3,4 ...
De Kimpe, Norbert   +5 more
core   +2 more sources

Alternative final steps in berberine biosynthesis in Coptis japonica cell cultures [PDF]

open access: yes, 1988
In Coptis japonica cell cultures an alternative pathway has been discovered which leads from (S)-tetrahydrocolumbamine via (S)-canadine to berberine. The two enzymes involved have been partially purified.
Galneder, E.   +4 more
core   +1 more source

1-[3-(4-Chloro­phen­yl)isoquinolin-1-yl]-3,5-diethyl-1H-pyrazole [PDF]

open access: yes, 2010
The title compound, C22H20ClN3, is composed of a dialkyl-substituted pyrazole ring connected to an aryl-substituted isoquinoline ring system with a dihedral angle of 55.8 (1)° between the pyrazole ring and and the isoquinoline ring system.
Barbour   +6 more
core   +3 more sources

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