Notizen: Benzoditropon, ein neues tricyclisches π-Elektronensystem

One hundred years of benzotropone chemistry

“…Aldol-type cyclizations provide an expedient access to the benzoditropones in a single step. Föhlisch and Widmann applied aldol-type cyclization for the synthesis of benzoditropones 506c–e ( Scheme 92 ) [ 238 ]. In an analogous manner, Soyer and Kerfento, and subsequently Soyer, attempted Aldol-type condensations of benzene-1,2,4,5-tetracarbaldehyde with the corresponding acetone derivatives to give the benzoditropone derivatives 506a–k ( Fig.…”