Keywords
alkynes
arylboronic acids
carbopalladation
catalysis
dienes.
palladium
transmetalation
Abstract
‘Ligand-free’ Pd-catalyzed reaction between arylboronic acid and diphenylacetylene affords a set of polyphenylated olefins and 1,2,3,4-tetraphenylnaphthalene whose yields are dependent on counteranion of PdII salt and additive nature. Tetraphenylethylene and hexaphenylbuta-1,3-diene are likely formed in tandem arylation/cross-coupling reaction with the participation of hydroxo/alkoxo alkenyl Pd species, whereas 1,2,3,4-tetraphenylnaphthalene formation probably proceeds through tandem arylation/C-H activation by halide-containing alkenyl Pd complexes.
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