Naozumi Sakaue

Selective preparation of polycyclic aromatic hydrocarbons. Part4.1 New synthetic route to anthracenes fromdiphenylmethanes using Friedel–Crafts intramolecular cyclization

Preparation of several anthracenes from diphenylmethanes by direct Bradsher-type reaction, which incorporates formylation of a hydrocarbon followed by Friedel–Crafts intramolecular cyclization, is presented. The present method involving the action of Cl2CHOMe and TiCl4 on a variety of diphenylmethanes (constructed such that electrophilic substitution occurs ortho to the biphenyl linkage) offers a convenient, mild, one-pot synthesis of substituted anthracenes.

Medium-sized Cyclophanes. Part 45.1 Synthesis, Oxidation, Electrophilic Substitution and Conformational Properties of 10,15-Dihydro-5H-tribenzo[a,d,g]cyclononenes and Their Analogues

The synthesis, oxidation and electrophilic substitution of the title compounds 2 and the conformational properties of some of the product ketones were studied.

Selective Preparation of Polycyclic Aromatic Hydrocarbons. Part 7.1 A Preparative Route to 10,11-Dihydro-5H-dibenzo[a,d]cyclohept enes using Friedel–Crafts Intramolecular Cyclobenzylation

A convenient, mild, one-pot synthesis of substituted dibenzo[a,d]cycloheptenes involving the action of ClCH 2 OMe and TiCl 4 on a variety of diphenylethanes,† which incorporates chloromethylation of a hydrocarbon followed by a Friedel–Crafts intramolecular cyclization reaction, is described.