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Author(s):   Arrington, C.A.; Ramos, C.; Robinson, A.D.; Zwier, T.S.
Title:   Aromatic ring-forming reactions of metastable diacetylene with 1,3-butadiene
Journal:   J. Phys. Chem. A
Volume:   102
Page(s):   3315 - 3322
Year:   1998
Reference type:   Journal article
Squib:   1998ARR/RAM3315-3322

Reaction:   C4H2* + 1,3-Butadiene → Products
Reaction order:   2
Rate expression:   no rate data available
Category:  Experiment
Data type:   Mechanistic information only
Experimental procedure:   Molecular beam
Excitation technique:   Sensitized photolysis
Analytical technique:   Mass spectrometry
Comments:   The subsequent reactions with C4H6 are allowed to proceed for 20 ís while the expansion traverses a short ceramic reaction tube or slit channel. Primary products are observed by quenching secondary processes as molecular collisions cease outside the tube. The major photochemical products C6H6 and C8H6 are detected in a linear time-of-flight mass spectrometer using both vacuum ultraviolet photoionization and resonant two-photon ionization (R2PI). R2PI spectra of the C6H6 and C8H6 products unambiguously identify them as benzene and phenylacetylene, respectively. Based on deuterium substitution experiments, a mechanism for these ring-forming reactions is proposed. The potential importance of these reactions for forming aromatics in sooting flames and planetary atmospheres is discussed

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