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Abstract
On the Thermal Isomerization and Aromatization of Hex‐1‐ene‐5‐yneThe gas phase conversion of hex‐1‐ene‐5‐yne induced by conventional hot‐wall pyrolysis, very low pressure pyrolysis (VLPP‐MS technique) and continuous‐wave CO2 laser‐photosensitized (SF6) pyrolysis was studied at 350–1100°C.The pyrolysis experiments were performed in quartz reactors and the reaction products analyzed by capillary gas chromatography, mass and n.m.r. spectroscopy. The pattern of conversion suggested for all the processes involved a sequence of isomerizations (→hexa‐1,2,5‐triene→methylcyclopentenes), aromatization (into benzene via pentafulvene) and CC bond rupture (into propargyl and allyl radicals).The formation of benzene is explained by reaction network with methylenecyclopentenes and methylcyclopentadienes as key intermediates.
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