Abstract A series of ruthenium complexes [(η 6-p-cymene) RuCl (L)][ligands L incorporate an azo group (1–5) or an imino group (6–7)] have been synthesized and studied as olefin isomerization catalyst with allylbenzene and 1-octene as model substrates. Temperature and catalyst/substrate mol ratio have been taken into account as parameters to optimize the isomerization reaction conditions. By using 1 H, 13 C NMR, FT-IR and microanalysis, the ...