“…Running the reaction under the standard conditions in dichloromethane or toluene under reflux, the desired cross-metathesis product α- 4a was isolated in low 10% and 3% yields ( Table 1 , entries 1 and 2). Although it has been observed that the use of octafluorotoluene [ 23 , 25 – 27 ] as the solvent had a positive effect on yields, its use provided α- 4a in a low 12% yield ( Table 1 , entry 3), but its use under microwave irradiation [ 26 , 28 – 30 ] gave rise to α- 4a in 33% isolated yield ( Table 1 , entry 4). A similar result (36% yield) was obtained with a 1:1 octafluorotoluene/ClCH 2 CH 2 Cl mixture ( Table 1 , entry 5).…”