Sentence examples for a directing group from inspiring English sources
On the assumption that anionic organic functional groups serves as a directing group for Zn2+ ion, poly(sodium p-styrenesulfonate) (PSSNa) was immobilized onto ITO surface by layer-by-layer (LbL) process, and ZnO was electrodeposited onto the modified ITO surface.
The early examples of enantioconvergent alkyl alkyl Suzuki Miyaura couplings all involved alkyl halide substrates with a directing group capable of coordinating the Ni center.
The authors propose that the Lewis basic dimethylamino group acts as a directing group to facilitate the C H activation event.
This preliminary data suggest that substrates bearing a directing group at the 3-position are optimal, but that the inclusion of directing groups at C6 are viable.
The initial idea behind this research was to use alkyl halides in direct alkylation reactions of benzylamines carrying a directing group on the amine function.
In an ongoing project to use pyridine as a directing group for the arylation of C H bonds, we have demonstrated the feasibility of sp arylation under Ru-catalysis.
A direct group comparison revealed stronger activation in the left-side mPFC and the ACC in patients; the reverse contrast showed stronger activation in the supramarginal gyrus, angular gyrus, precuneus, and middle frontal gyrus regions in control subjects.
However, in contrast to existing enantioselective RhIII-catalyzed C H functionalizations, which all rely upon aryl C sp)–H activation of substrates containing a single directing group (Scheme 1 a),[ 2– 5] the substrates 1 required for our proposed study contain two potential directing groups (Scheme 1 b).
A traceless directing group strategy was adopted, and a screen of leaving groups bearing different chelating moieties identified 2-methylthio ester 233 as optimal (Scheme 21 a).
The presence of a suitable directing group in the molecule is one way to achieve this: the metal catalyst is directed to a specific position, in which it activates one C H bond.
In addition to amides, 2-hydroxyphenyl was found to be an effective directing group to enable enantioselective fluorination of a number of tethered alkenes under similar conditions (Scheme 61).
