title: Chiral Catalyst Design: Cyclopentadiene-Based Brønsted Acids.
abstract: The combination of -I and -M effects and the aromaticity of the conjugate base renders the chiral pentacarboxy-substituted cyclopentadienes (PCCPs) acidic. Their convenient synthesis together with substrates derived from the chiral pool and their performance in the tested reactions renders them prodigious candidates to become a new and highly competitive class of chiral Brønsted acid catalysts.
authors.affiliation: Department of Organic Chemistry, University of Regensburg, Universitätsstrasse 31, 93040, Regensburg, Germany. ivana.fleischer@chemie.uni-regensburg.de.
authors.forename: Ivana
authors.identifier: 0000-0002-2609-6536
authors.initials: I
authors.lastname: Fleischer
keywords: Brønsted acids; aldol reaction; enantioselectivity; organocatalysis; oxocarbenium ions