The Trityl Cation Embedded into a [7]Helicene-Like Backbone: Preparation and Application as a Lewis Acid Catalyst

Autor:	Martin Oestreich, Benjamin M. Gross
Rok vydání:	2021
Předmět:	chemistry.chemical_compound Annulation Carbenium ion Helicene Fluorenone Chemistry Organic Chemistry Polymer chemistry Lewis acids and bases Carbonylation Catalysis Lewis acid catalysis
Zdroj:	Synthesis. 53:2512-2516
ISSN:	1437-210X 0039-7881
DOI:	10.1055/a-1404-4966
Popis:	The synthesis of a helically chiral carbenium ion is reported. The new motif is essentially a trityl cation embedded into a [7]helicene-like framework. The key step in its preparation establishes the π-extended fluorenone system in one step by an unprecedented palladium-catalyzed carbonylative annulation of a 4,4′-biphenanthryl-3,3′-diyl precursor. The racemic form of the new carbon Lewis acid was found to catalyze a representative set of reactions typically promoted by the trityl cation.
Databáze:	OpenAIRE
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