Palladium(II) acetate in association with secondary phosphine oxides provides an efficient catalytic system for [2+1] cycloadditions starting from oxanorbornene derivatives and tertiary propargyl esters giving rise to vinylidenecyclopropanes. This reaction is specific to bidentate phosphinito–phosphinous acid ligands generated from secondary phosphine oxides. The [2+1] cycloaddition was found broad
A mild and efficient method for the synthesis of functionalized 1,5-dien-3-ynes from 1,3-diynes under PdII catalysis is described. The process allows quick and atom-economical assembly of various dihalo-, haloacyl-, and diacyl-substituted 1,5-dien-3-ynes in high yields. The switch of selectivity in the formation of these dienyne products can be controlled by the choice of catalysis system and reaction
Visible-light-activated copper(<scp>i</scp>) catalyzed oxidative C<sub>sp</sub>–C<sub>sp</sub> cross-coupling reaction: efficient synthesis of unsymmetrical conjugated diynes without ligands and base
A novel visible-light-promoted copper-catalysed process for highly selective Csp-Csp cross-coupling reaction of terminal alkynes at room temperature is described. The current photochemical method is simple, high functional group compatible, and...
The ruthenium-catalyzed isomerization of diynes and triynes involving propargyl carboxylate moieties affords dienynes and dienediynes, respectively. The [1,n]-metallotropic shift (n = 3, 5) (carbene walk) of in situ generated alkynyl carbene complexes has been proposed for the catalytic isomerization reaction.