Kinetics and mechanism of the addition of 1,3-butadiene to cyclohexa-1,3-diene in the gas phase

The thermal reactions of 1,3-butadiene (BD) with cyclohexa-1,3-diene (CHD) have been studied in a static system between 437 and 526 K. The pressures of BD and CHD were varied from 61 to 397 torr and from 50 to 93 torr, respectively. The percentages of consumed BD and CHD were always kept lower than 14%. The reactions—in the order of importance—are All the reactions are homogeneous and of the first order with respect to the reagents. Their rate constants (in L/mol·s) are given by A thermochemical analysis of a biradical mechanism is in agreement with these results.