Sentence examples for highly hindered from inspiring English sources

This overview addresses the key area of hydrodesulfurization chemistry concerning the desulfurization of highly hindered sulfur containing molecules.

Practical and efficient protocols to obtain highly hindered polyanionic chelating ligands based on bis- 3,5-di-tert-butyl-2-hydroxybenzamido) compounds are reported here.

Illustrative is the case of the highly hindered bis-ortho-substituted 2,6-dimethoxy-phenyllithium, used in the synthesis of compounds 2i 2k, which was prepared by direct metalation of 1,3-dimethoxybenzene.

spectra and corresponding τc values of the cation in the swollen membrane and in ionomer solutions are similar, but clearly different from those measured in the neat solvents; these results were explained by assuming that the alcohols penetrate into the perfluorinated regions, and form small solvent pools with a diameter <20 Aå, where the motion of the cation is highly hindered.

The ring-opening polymerizations of cyclic esters initiated by complex 5, however, was not effective possibly due to the highly steric hindered metal center.

Central to this, is the ability of this organism to functionalise substrates (androgens, progestogens) at the highly stereochemically hindered 8β-position of the steroid nucleus.

Although the anions located at the cores of 3-armed star polymers were believed to be highly sterically hindered, the coupling reactions proceeded virtually quantitatively under the conditions in THF at −78 °C for 24 h.

Two intrinsically microporous polyimides were obtained by high-temperature, one-pot polycondensation reaction of novel triptycene-based dianhydrides containing dimethyl- or diisopropyl-bridgehead groups with a commercially available highly sterically hindered 3,3ʹ-dimethylnaphthidine (DMN) diamine monomer.

In this research work, we report the synthesis and properties of MAN copolymers modified with highly sterically hindered phthalimide groups.

Notably, the formation of a highly sterically hindered spirodialin 3 s containing contiguous all-carbon sp quaternary centers from 1,3-enyne 2 j occurred efficiently [Eq. (3)].

Under the Ottomans there were periodic clampdowns and a special head tax levied on Alawite 'apostates' for their 'heresy.' The mountain range of 'Jabal al-Sahiliyah' became a refuge for the various Alawite tribes despite the fact that its harsh environment meant that settlements were highly compartmentalised which hindered community cohesion.