This unfortunate limitation can perhaps be explained by considering the different intermediates generated by protonation of an imine or carbonyl versus an alkene (Fig. 1a). Protonation of an imine ...

The researchers added trifluoroacetic acid to promote the protonation of halopyridines ... Photo-induced catalytic halopyridylation of alkenes, Nature Communications (2021).

a proton (H +) is transferred from the acid to the alkene's C=C bond. The reactive species that results from this protonation is an intermediate called a carbocation (Fig. 1a). These are among the ...

Chirality of vitamin-D derivative affects the protonation states of its receptor protein Date: October 31, 2018 Source: Toyohashi University of Technology Summary: Researchers have highlighted the ...

The researchers used an easily accessible and reusable chemical called vinyl ketone as the "olefination reagent" to help create alkenes. By fine-tuning the reaction parameters of the vinyl ketone ...