Abstracts Chemistry

Aromatization of petroleum hydrocarbons. Synthesis of cyclopentenediones (a summary).

by Ronald H. Blizzard

The feasibility of producing toluene by the aromatization of paraffins and naphthenes has been reinvestigated. The preparation of chromium oxide-alumina catalysts has been improved and the optimum conditions for the aromatization of pure n-heptane, methylcyclohexane, heptenes, enfi selected fractions of a Turner Valley naphtha have been determined. A simplified catalysis apparatus and a new type of stillhead are described. Data is given for the preparation of isomeric heptenes and heptane from heptanol-2, and for a close fractionation of a Turner Valley naphtha. The Gabriel-Nathanson Rearrangement of benzalmaleide into 2-phenylcyclopentenedione-1, 3, of α, β- diphenyl-γ-benzalcrotonolactone into triphenylcyclopentenedione, and of benzalphthalide into 2-phenylindandione-1,3 has been investigated in part.