The α-/β-C−H functionalization of E styrenes with simple alkenes and alkynes is presented. The process involves α C−H functionalization via a six-membered exo-palladacycle to afford tri- and tetrasubstituted 1,3-dienes and β C−H functionalization via a seven-membered endo-palladacycle to produce tetra- and pentasubstituted 1,3,5-trienes, both enabled by the chelation assistance of pyrazinamide.
modification of methylricinoleate by etherification of the hydroxyl group was accomplished by using a nonclassical ruthenium‐catalyzed allylation reaction and also by esterification. Methylricinoleate derivatives were engaged in ring‐closing metathesis (RCM) reactions leading to biosourced 3,6‐dihydropyran and α,β‐unsaturated lactone derivatives with concomitant production of polymerprecursors. Sequential