Synthesis of novel phosphonium betaines and bis-betaines derived from hexafluoro-1,4-naphthoquinone

[Display omitted] •Reaction of hexafluoro-1,4-naphthoquinone with bis-phosphanes gave phosphonium betaines and bis-betaines.•The highest yields of phosphonium betaines and bis-betaines were obtained in aqueous dioxane or DMSO, respectively.•Upon TLC the betaines underwent a ring contraction to inden...

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