Results 341 to 350 of about 291,669 (391)

Amide Effects in C-H Activation: Noncovalent Interactions with L-Shaped Ligand for meta Borylation of Aromatic Amides.

Angewandte Chemie, 2018
A new concept for the meta-selective borylation of aromatic amides is described. It has been demonstrated that while esters gave para borylations, amides lead to meta borylations.
Ranjana Bisht, M. Hoque, B. Chattopadhyay   +2 more
semanticscholar   +1 more source

Amides in Nature and Biocatalysis

Journal of Biotechnology, 2016
Amides are widespread in biologically active compounds with a broad range of applications in biotechnology, agriculture and medicine. Therefore, as alternative to chemical synthesis the biocatalytic amide synthesis is a very interesting field of research. As usual, Nature can serve as guide in the quest for novel biocatalysts.
Pitzer, J., Steiner, K.
openaire   +4 more sources

Properties of amidated pectins. I. Preparation and characterization of amidated pectins and amidated pectic acids

Food Hydrocolloids, 1986
Abstract The preparation of high molecular weight pectic acids with varying degrees of amidation (15–61%) is described. The samples are characterized by analytical parameters, viscosity and behaviour on gel permeation and ion-exchange chromatography columns.
Reitsma, J.C.E., Thibault, J.F., Pilnik, W.   +2 more
openaire   +3 more sources

Acyl and Decarbonylative Suzuki Coupling of N-Acetyl Amides: Electronic Tuning of Twisted, Acyclic Amides in Catalytic Carbon–Nitrogen Bond Cleavage

ACS Catalysis, 2018
We report the Pd-catalyzed acyl and the Ni-catalyzed biaryl Suzuki–Miyaura cross-coupling of N-acetyl-amides with arylboronic acids by selective N–C(O) cleavage.
Chengwei Liu, Guangchen Li, Shicheng Shi, Guangrong Meng, R. Lalancette, R. Szostak, M. Szostak   +6 more
semanticscholar   +1 more source

ChemInform Abstract: STUDIES OF THIO AMIDES AND AMIDES‐ CONVERISON OF THIO AMIDES INTO AMIDES BY TRIMETHYLOXONIUM FLUOROBORATE

Chemischer Informationsdienst, 1977
AbstractKindler‐Reaktion der Säurechloride (I) mit den Aminen (II) ergibt die Amide (IIIa)‐alle), von denen (IIIa) bzw. (IIIb) beim Erhitzen mit P2S5 in die Thioamide (IVa) bzw. (IVb) übergehen.
openaire   +2 more sources

Insertion of Amides into a Polyoxometalate

Angewandte Chemie, 2009
AbstractDer Einbau eines Amid‐Sauerstoffatoms in das Gerüst des Dawson‐Polyoxometallat(POM)‐Clusters [P2V3W15O62]9− (siehe Bild) ermöglicht elektronische Wechselwirkungen zwischen den organischen und anorganischen Teilen des Moleküls: Die Redoxeigenschaften des gesamten Hybrid‐POM lassen sich mithilfe der organischen Komponenten einstellen, und die ...
Bernold Hasenknopf, Max Malacria, Inga Huth, Serge Thorimbert, Lise-Marie Chamoreau, Joaquim Li, Emmanuel Lacôte   +6 more
openaire   +3 more sources

Transition-Metal-Free Esterification of Amides via Selective N-C Cleavage under Mild Conditions.

Organic Letters, 2018
A general, transition-metal-free, and operationally simple method for esterification of amides by a highly selective cleavage of N-C(O) bonds under exceedingly mild conditions is reported.
Guangchen Li, P. Lei, M. Szostak
semanticscholar   +1 more source

Primary, Secondary, and Tertiary γ-C(sp3)-H Vinylation of Amides via Organic Photoredox-Catalyzed Hydrogen Atom Transfer.

Organic Letters, 2018
An efficient strategy for primary, secondary and tertiary aliphatic γ-C(sp3)-H vinylation of amides with alkenylboronic acids is reported. These reactions are catalyzed by visible-light organic photoredox agents.
Hui Chen, Liangliang Guo, Shouyun Yu
semanticscholar   +1 more source

Calculated amide/enol of amide energy differences for several interesting amide systems

Chemical Communications, 2000
The calculated pKEnol values for the enols of amides Me2CHCON(Me)Ph and XCH2CH(NH2)CONHMe (X = H,OH) are lower by only 1.1–2.7 units than that of acetamide, and therefore these enols should not display unusual stability.
Zvi Rappoport, Hiroshi Yamataka
openaire   +2 more sources

The amide bond stretch of cyclic cis-amides

Spectrochimica Acta Part A: Molecular Spectroscopy, 1987
Abstract I.r. and Raman spectra of substituted 2-pyrrolidinones have been run. Examination of these spectra and comparison of them with work on N-methyl 2-pyrrolidinone supports earlier conclusions that the amide bond stretching mode of cyclic cis-amides absorbs between 1500 and 1460 cm−1.
Anne M. DeProspo, Dana P. McDermott, D. Michael Byler   +2 more
openaire   +2 more sources