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Addition and cyclization reactions in the thermal conversion of hydrocarbons with enyne structure, I. Detailed analysis of the reaction products of ethynylbenzene

✍ Scribed by Hofmann, Jörg ;Zimmermann, Gerhard ;Guthier, Klaus ;Hebgen, Peter ;Homann, Klaus-Heinrich

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
630 KB
Volume
1995
Category
Article
ISSN
0947-3440

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✦ Synopsis

The pyrolysis of ethynylbenzene (C8H6, 1) was studied in a flow system between 700 and 1100°C (reaction time about 0.3 s) by using a mixture of 5 mol-% of 1 in nitrogen and also in hydrogen at 700°C. The products were analyzed gas chromatographically. At 700°C in nitrogen, the main products were 1-and 2-phenylnaphthalene (2, 3), l-methylene-2-phenyl-1 H-indene (4), 1 -methylene-3-phenyl-1 H-indene (5), and 5,10-dihydroindeno[2,l-a]indene (6). At higher temperatures, ethynylaromatics and more stable aromatics such as benzene, naphthalene, acenaphthylene, biphenyl, pyrene, fluoranthene, and six further C16H1O isomers where detected. With hydrogen as diluent, the dimer formation was reduced, mainly in favor of styrene. -The complex mixture of reaction products and the dependence of its composition on the pyro-

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