Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Synthesis of Helicenes Utilizing Palladium-Catalyzed Double C-H Arylation Reaction.Name: Tricyclohexylphosphonium tetrafluoroborate.
[5]- And [6]helicenes, e.g., I, were synthesized in moderate to good yields from Z,Z-bis(bromostilbene)s by palladium-catalyzed double C-H arylation reaction. This method can be applied to the syntheses of helicenes possessing electron-deficient substituents.
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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem