SEARCH Articles Figures Tables Acrylic acid Cyclopentadiene Cyclopentadiene Lewis acid promoted Cyclopentadiene carboxylic acid Cyclopentadiene derivatives acidity Cyclopentadiene, carbon acidity-carbanion Cyclopentadienes Lewis acid catalysed Cyclopentadienes Lewis acid promoted Cyclopentadienes gas-phase acidity Cyclopentadienes non-Lewis acid catalysed