1 , 2 - Pentadiene Decomposition

1,2-Pentadiene has been decomposed in single pulse shock tube experiments. There appear to be a large number of parallel decomposition and isomerization channels. The following rate expressions for isomerization in the temperature range 1100–1250 K and pressures between 200 and 300 kPa have been obtained k(1,2-pentadiene→ 1-pentyne) = 1.0× 10 exp(−32300± 900 K/T ) s−1 k(1,2-pentadiene→ cis/trans-1,3-pentadiene = 2.2× 10 exp(−33900± 900 K/T ) s−1 k(1,2-pentadiene→ cyclopentene) = 1.8× 10 exp(−26080± 900 K/T )s−1 Overall, we estimate the 2σ uncertainty in the absolute rate constants to be about 30%. From detailed balance the rate expression for 1,3 to 1,2-pentadiene isomerization has been found to