Synthesis 2006(15): 2556-2562  
DOI: 10.1055/s-2006-942468
PAPER
© Georg Thieme Verlag Stuttgart · New York

Regiospecific Synthesis of Benzo[b]fluorenones via Ring Contraction by Benzil-Benzilic Acid Rearrangement of Benz[a]anthracene-5,6-diones

Asit Patra, Sujit K. Ghorai, Saroj R. De, Dipakranjan Mal*
Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
e-Mail: dmal@chem.iitkgp.ernet.in;
Further Information

Publication History

Received 24 February 2006
Publication Date:
04 July 2006 (online)

Abstract

A regiospecific route to benzo[b]fluorenones is described. The synthesis is based upon a one-pot, regiospecific benzannulation of 1,4-dipolar synthons with naphthoquinone monoketal and ring contraction of the generated benz[a]anthracene-5,6-diones through benzil-benzilic acid rearrangement.