Results 251 to 260 of about 19,002,772 (320)

Traceless Bidentate Directing Group Assisted Cobalt-Catalyzed sp2-C-H Activation and [4 + 2]-Annulation Reaction with 1,3-Diynes.

Organic Letters, 2020
An efficient cobalt-catalyzed [4 + 2] annulation of hydrazones and 1,3-diynes has been developed for the synthesis of 3-alkynylated isoquinolines engaging 2-aminopyridine as a traceless bidentate directing group.
A. Dey, Chandra M. R. Volla
semanticscholar   +1 more source

Development of a Traceless Directing Group: Cp*-Free Cobalt-Catalyzed C-H Activation/Annulations to Access Isoquinolinones.

Journal of Organic Chemistry, 2020
A new traceless directing group, 2-(hydroxymethyl)pyridine, has been reported for the Cp*-free cobalt-catalyzed C-H activation/annulation reaction to synthesize isoquinolinones. The reaction exhibits good functional group tolerance, affording products in
Minghui Liu, Jun‐Long Niu, Dandan Yang, Mao‐Ping Song   +3 more
semanticscholar   +1 more source

Domino C–H Activation/Directing Group Migration/Alkyne Annulation: Unique Selectivity by d6-Cobalt(III) Catalysts

, 2020
Distinct selectivity control in Cp*CoIII-catalyzed domino C–H activation/pyridine directing group migration/alkyne annulation has been accomplished through the nucleophilicity of an organometallic ...
Cuiju Zhu, Rositha Kuniyil, B. B. Jei, L. Ackermann   +3 more
semanticscholar   +1 more source

Directing Group Assisted Unsymmetrical Multiple Functionalization of Arene C−H Bonds

The chemical record, 2020
Multiple C−H bond functionalizations promptly install diverse groups on the molecular framework and consequently fabricate complex molecular entities.
Koushik Ghosh, Raja K. Rit, Majji Shankar, K. Mukherjee, A. Sahoo   +4 more
semanticscholar   +1 more source

Pd-Catalyzed C-H Halogenation of Indolines and Tetrahydroquinolines with Removable Directing Group.

Organic Letters, 2020
Pd-catalyzed directing-group-assisted regioselective halogenations to C7 of indolines and C8 of tetrahydroquinolines were achieved in good to excellent yields.
Ashfaq Ahmad, Himangsu Sekhar Dutta, M. Kumar, Afsar Khan, Raziullah, Dipankar Koley   +5 more
semanticscholar   +1 more source

Patient group directions

Emergency Nurse, 2010
The patient group directions (PGD) website, which is part of the National electronic Library for Medicines (NeLM), is the national resource in England for healthcare professionals who work with, or who are involved in the development or review of, PGDs.
openaire   +2 more sources

A Rare Ruthenium(II)-Catalyzed Inert C-H Bond Activation Assisted by a Chiral Transient Directing Group.

Angewandte Chemie, 2019
A ruthenium(II)-catalyzed asymmetric intramolecular hydroarylation assisted by a chiral transient directing group has been developed. A series of 2,3-dihydrobenzofurans bearing chiral all-carbon quaternary stereocenters have been prepared in remarkably ...
Guozhu Li, Qinzhe Liu, Laxmaiah Vasamsetty, Weicong Guo, Jun Wang   +4 more
semanticscholar   +1 more source

On the Group of a Directed Graph

Canadian Journal of Mathematics, 1966
In 1938, Frucht (2) proved that for any given finite group G there exists a finite symmetric graph X such that G(X) is abstractly isomorphic to G. Since G(X) is a permutation group, it is natural to ask the following related question : If P is a given finite permutation group, does there exist a symmetric (and more generally a directed) graph X such ...
openaire   +1 more source

On Direct Products of Abelian Groups

Canadian Journal of Mathematics, 1970
In this paper we investigate the properties of the product (or complete direct sum) of torsion Abelian groups. The chief results concern products of Abelian primary groups (p-groups). Given a set of p-groups, [Gλ], over an index set Λ, the product of these groups is written λλ∈ΔGλ, the torsion subgroup of the product of these p-groups is written T[λGλ],
Irwin, John M., O'Neill, John D.
openaire   +2 more sources

Chiral Transient Directing Group Strategies in Asymmetric Synthesis.

Chemistry - An Asian Journal, 2020
The development of novel methodologies for catalytic enantioselective functionalization reactions enabled by chiral transient directing groups is accompanying in a paradigm shift in the field of asymmetric synthesis.
Debojyoti Bag, P. Verma, Sanghapal D. Sawant   +2 more
semanticscholar   +1 more source