Hollow Pt–Ag nanoparticles synthesized by oxygen assisted acid etching exhibited high specific activity and durability as electrocatalysts for the oxygen reduction reaction.
This work reports an experimental and theoretical study of the conformational preferences of several Prelog-Djerassi lactone derivatives, to elucidate the (1)H NMR chemical shift differences in the lactonic core that are associated with the relative stereochemistry of these derivatives. The boat-like conformation of explains the anomalous (1)H chemical shift between H-5a and H-5b, in which the two methyl groups (C-8 and C-9) face H-5b, leading to its higher shielding effect.
Herein, we report a fully detailed mechanistical study involving an organocatalyzed 1,3-dipolar cycloaddition via a enolate or stabilized vinylogous carbanion intermediates and azide for the synthesis of 1,2,3-triazoles. A detailed...
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