Results 21 to 30 of about 32,974 (279)

Heavy atom effects in the Paternò–Büchi reaction of pyrimidine derivatives with 4,4’-disubstituted benzophenones

Beilstein Journal of Organic Chemistry, 2011
The regioselectivity and the photochemical efficiency were investigated in the Paternò–Büchi reaction of 1,3-dimethylthymine (DMT) and 1,3-dimethyluracil (DMU) with benzophenone (1b) and some 4,4’-disubstituted derivatives (dimethoxy (1a), difluoro (1c),
Feng-Feng Kong, Jian-Bo Wang, Qin-Hua Song   +2 more
doaj   +1 more source

The Nitrilimine–Alkene Cycloaddition Regioselectivity Rationalized by Density Functional Theory Reactivity Indices

Molecules, 2017
Conventional frontier molecular orbital theory is not able to satisfactorily explain the regioselectivity outcome of the nitrilimine–alkene cycloaddition.
Giorgio Molteni, Alessandro Ponti
doaj   +1 more source

Deprotometalation-Iodolysis and Direct Iodination of 1-Arylated 7-Azaindoles: Reactivity Studies and Molecule Properties

Molecules, 2021
Five protocols were first compared for the copper-catalyzed C-N bond formation between 7-azaindole and aryl/heteroaryl iodides/bromides. The 1-arylated 7-azaindoles thus obtained were subjected to deprotometalation-iodolysis sequences using lithium 2,2,6,
Mohamed Yacine Ameur Messaoud, Ghenia Bentabed-Ababsa, Ziad Fajloun, Monzer Hamze, Yury S. Halauko, Oleg A. Ivashkevich, Vadim E. Matulis, Thierry Roisnel, Vincent Dorcet, Florence Mongin   +9 more
doaj   +1 more source

regioselectivity (regioselective) [PDF]

, 2014
Citation: 'regioselectivity (regioselective)' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.R05243 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms ...
openaire   +1 more source

Molecular Basis of C-30 Product Regioselectivity of Legume Oxidases Involved in High-Value Triterpenoid Biosynthesis

Frontiers in Plant Science, 2019
The triterpenes are structurally diverse group of specialized metabolites with important roles in plant defense and human health. Glycyrrhizin, with a carboxyl group at C-30 of its aglycone moiety, is a valuable triterpene glycoside, the production of ...
Much Zaenal Fanani, Ery Odette Fukushima, Ery Odette Fukushima, Satoru Sawai, Satoru Sawai, Satoru Sawai, Satoru Sawai, Jianwei Tang, Masato Ishimori, Hiroshi Sudo, Kiyoshi Ohyama, Kiyoshi Ohyama, Hikaru Seki, Hikaru Seki, Kazuki Saito, Kazuki Saito, Toshiya Muranaka, Toshiya Muranaka   +17 more
doaj   +1 more source

Regioselective Oxidative Arylation of Fluorophenols [PDF]

Angewandte Chemie International Edition, 2019
AbstractA metal free and highly regioselective oxidative arylation reaction of fluorophenols is described. The relative position of the fluoride leaving group (i.e., ortho or para) controls the 1,2 or 1,4 nature of the arylated quinone product, lending versatility and generality to this oxidative, defluorinative, arylation concept.
Yu, Congjun, Patureau, Frederic W.
openaire   +3 more sources

Regioselective Reduction of β‐Enaminoesters

Synthetic Communications, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Hussaini, SR, Moloney, M
openaire   +1 more source

ALLYLATION OF ARYL GRIGNARD REAGENTS IN THE PRESENCE OF TRANSITION METAL CATALYSIS AND ORGANIC CATALYSIS

Journal of the Turkish Chemical Society, Section A: Chemistry, 2017
The allylation yield and regioselectivity of phenyl Grignard reagent in THF was investigated in the presence of complexed transition metals and also uncomplexed or complexed transition metal salts.
Melike Kalkan
doaj   +1 more source

Jumping in the Chiral Pool: Asymmetric Hydroaminations with Early Metals

Molecules, 2023
The application of early-metal-based catalysts featuring natural chiral pool motifs, such as amino acids, terpenes and alkaloids, in hydroamination reactions is discussed and compared to those beyond the chiral pool.
Sebastian Notz, Sebastian Scharf, Heinrich Lang   +2 more
doaj   +1 more source

Modulating regioselectivity of CYP107J3-catalyzed isophorone hydroxylation by disrupting the hydrophobic balance of the substrate binding pocket

Green Synthesis and Catalysis
4-Hydroxyisophorone (4HIP) is an oxygenated intermediate derived from isophorone, serving as an important flavor and fragrance and chiral synthon of pharmaceutical drugs.
Meng Dai, Xiaojuan Yu, Xiaogang Peng, Zhiyong Guo, Huili Yu, Aitao Li   +5 more
doaj   +1 more source