Sentence examples for directing group from inspiring English sources

The 'safety-catch' nature of the sulfoxide directing group is illustrated in a selective, iterative double cross-coupling process.

Cleavage of the pyridine directing group is also demonstrated and gives a good yield of 78%% over two steps.

However, with substitution at other positions on the pyridine directing group, the reaction proceeds in excellent yield (2 h, i).

Thus, a sulfide substituent can be carried through a synthesis before selective sulfur oxidation delivers the directing group effect precisely when and where it is required.

Within the accepted model for enantioinduction using complexes 3,[ 2b, 5] cyclorhodation can generate up to four species, which differ in which directing group participates in cyclometallation, and/or the orientation of the rhodacycle within the chiral pocket (Scheme 2).

This method proceeds with a range of alkynes and triazines, although it appears to be advantageous to have the Lewis base directing group at C3 of the diene cycloaddition partner.

Finally, two-directional coupling of a thiophene bearing two sulfoxide directing groups gave 3 ak in good yield (Table 3).

The issue of the selectivity in C H bond activation is solved using directing groups.

This set of tools (ruthenium, C H bonds, directing groups) provides easy access to the tailored formation of new C C and C heteroatom bonds.

It is also in agreement with the need for a sufficiently strongly σ-donating directing group, hence why oxygen-based directing groups[ 42] proved ineffective.

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.