Cyclododecene cometathesis with hexene-1 on the MoCl5/SiO2–Me4Sn catalytic system

The stereochemistry of the cometathesis of cyclododecene (CDD) with hexene-1 in the presence of the MoCl 5 /SiO 2 –Me 4 Sn heterogeneous catalytic system has been studied. It has been established that CDD is the mixture of cis- ( Z ) and trans - ( E ) stereoisomers with the ratio of 30/70, respectively. It has been shown that the reactivity of the E -stereoisomer of CDD in the reaction of cometathesis is higher when compared to the Z -stereoisomer. Thus, when the conversion of CDD is 92%, the ratio E / Z = 6 : 94, i.e., the amount of the E -stereoisomer decreases from 70 to 7%, while the amount of the Z -stereoisomer increases from 30 to 93%, respectively.