Zur Gasphasenpyrolyse von α, ω‐Phenylalkenen – Gesetzmäßigkeiten und Besonderheiten

Abstract

On the Gas Phase Pyrolysis of α, ω‐Phenylalkenes — Regularities and Special Features The thermal conversion of the α, ω‐phenyl alkenes 1 to 4 was studied in the presence of a molar excess of Ar or steam at 500 to 875°C in a labscale tubular reactor. Detailed GC analyses did not establish significant evidences for such molecular rearrangements like, e.g., Di‐π‐methane rearrangement of 2, Ene and Carbo‐Claisen reaction of 3. The decomposition obviously occurs via radical chain processes in the main. Besides them, however, radical cyclizations, Neophyl rearrangements and Retro‐Ene reactions are parts of the complex reaction.

Thermally-generated reactive intermediates: Trapping of the parent ferrocene-based o-quinodimethane and reactions of diradicals generated by hydrogen-atom transfers

“…3 xii Table A-II. Products and recovered starting material, total recovery of material, and conversion from the FVP of o-methallyltoluene (10) at various temperatures 88 (17), and o-allylcumene (21) and T50% values for the conversion of 6, 10, 17, 21, o-(3-butenyl)toluene (23}, and o-(4-pentenyl}toluene (24) PAPER 3 Table I. Products and recovered starting material, total recovery of material, and conversion from the FVP of 2-methyl-2'-vinylbiphenyl at various temperatures xiii Table II.…”