Results 141 to 150 of about 142,770 (196)

Growth and differentiation: Life processes in crops [PDF]

, 2002
This booklet discusses two basic life processes in nature:growth and differentiation.It uses the examples of apples,carrots and wheat to illustrate how growers can recognize these processes and can take practical measures to correct the balance between ...
Bloksma, Joke, Huber, Machteld
core  

Biomimetic Orthogonal Removal of Arylacyl Protecting Groups from the C‐Terminus of Substituted Amino Acids and Oligopeptides via Flavin N(5)‐iminium Covalent Adducts

Advanced Synthesis &Catalysis, EarlyView.
Abstract Flavin co‐factors and other flavin derivatives are traditionally associated with one‐ or two‐electron redox reactions. Flavins also form covalent intermediates with a variety of substrates. While extensive attention has focused on reactions at the C(4a) position of the flavin ring, recent interest has shifted toward the dynamic potential of ...
Tetiana Pavlovska, Martin Havlík, Magdalena Labíková, Radek Cibulka   +3 more
wiley   +1 more source

Double‐Sided Control of Product Type Preference in the Visible‐Light Initiated Reaction of 1,3‐Dicarbonyl Compounds with Alkenes

Advanced Synthesis &Catalysis, EarlyView.
Abstract The demonstrated light‐initiated addition of radicals formed on an active methylene group to styrene derivatives exhibits a product selectivity influenced by the presence of a protic solvent. Under protic conditions, the predominant products are branched compounds with the alkene moiety attached to the methylene group.
Małgorzata Pałyga, Jan Rzepiela, Sebastian Baś   +2 more
wiley   +1 more source

Gram‐Scale Photocatalysis with a Stable and Recyclable Chromium(III) Photocatalyst in Acetonitrile and in Water

Advanced Synthesis &Catalysis, EarlyView.
Abstract The use of stable photosensitizers made on a multigram‐scale from cheap and available starting materials offers an extraordinary opportunity to translate small‐scale proof‐of‐concept photoreactions to widespread applications in non‐specialized laboratories, thereby promoting the implementation of light‐driven syntheses.
Steven Sittel, Julian Neuner, Jonas M. Grenz, Christoph Förster, Robert Naumann, Katja Heinze   +5 more
wiley   +1 more source

Symmetry matters: photodissociation dynamics of symmetrically versus asymmetrically substituted phenols [PDF]

, 2014
Ashfold, Michael N. R., Karsili, Tolga N. V., Marchetti, Barbara, Wenge, Andreas M.   +3 more
core   +1 more source

Heterogeneously Catalyzed Cascade Oxidative Coupling/Dearomative Spirocyclization of Diarylamines: Facile Access to Spiroacridines

Advanced Synthesis &Catalysis, EarlyView.
Abstract Spirocyclic compounds, particularly spirocyclohexadienones, are important in pharmaceuticals due to their biological activity. In this study, we develop a catalytic cascade oxidative spirocyclization of diarylamines for the rapid access to highly functionalized spirocyclohexadienones. Using commercially available recyclable heterogeneous metal
Kenji Matsumoto, Naho Sato, Yoshinori Kobayashi, Kanako Date, Yasuko Okamoto, Touya Kariya, Tsukasa Hirokane, Masahiro Yoshida   +7 more
wiley   +1 more source

Continuous Flow Technology Enabling Photochemistry

Advanced Synthesis &Catalysis, EarlyView.
Abstract The merger of continuous flow technology and modern photochemistry has enabled countless applications showcasing new opportunities for chemical synthesis demonstrating improvements in selectivity, safety, sustainability and scalability. This focused review aims to highlight a selection of recently published case studies from academic and ...
Ruairi Crawford, Marcus Baumann
wiley   +1 more source

Illuminating the Path of Rearrangement: Visible Light‐Driven Pd‐Catalyzed Substituted Olefins Synthesis

Advanced Synthesis &Catalysis, EarlyView.
Abstract Pd‐catalyzed reactions are among the most straightforward and efficient methods to proficiently build Csp2‐Csp2 bonds. Nevertheless, thermal activation remains mandatory in most cases, which may decrease the compatibility with sensitive functional groups.
Jenifer Sharshonov, Valentin Duchemann, Yuqian Sun, Christine Tran, Philippe Belmont, Abdallah Hamze, Diana Lamaa, Etienne Brachet   +7 more
wiley   +1 more source

Molecular orbital study of the oxidation of steroidal phenols into quinols and epoxyquinols

Journal of the Serbian Chemical Society, 2000
The MO study showed that the radical oxidation of phenols into quinols occurs readily. Further radical oxidation (in the m-CPBA / (BzO)2 /hn system) of quinols occurs through appropriate biradical species with an activation energy of 79.5 kJ/mol yielding
MIROSLAV J. GASIC, IVAN JURANIC, BOGDAN SOLAJA, DRAGAN MILIC, ZORAN MARKOVIC   +4 more
doaj  

Synthesis of spirolactones from carbonyls via carboborylation of N‐sulfonylhydrazones with alkoxycarbonylalkylboronic acids

Advanced Synthesis &Catalysis, Accepted Article.
A straightforward synthesis of spirolactones from carbonyls via N‐tosylhydrazones is described. The process consist in the reaction between the N‐tosylhydrazone and ethoxycarbonylethylboronic acid or ethoxycarbonylpropylboronic acid, leading to spiro γ‐butyrolactones or δ‐valerolactones respectively. The transformation takes place by carboborylation of
Lucía López, Sara Filgueira, María-Paz Cabal, Alfonso Carlos Valdés-Gómez   +3 more
wiley   +1 more source