TY - JOUR A1 - Kadyrov, Renat A1 - Rosiak, Anna T1 - Synthesis of Ru alkylidene complexes JF - Beilstein Journal of Organic Chemistry PY - 2011/// VL - 7 SP - 104 EP - 110 SN - 1860-5397 DO - 10.3762/bjoc.7.14 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.7.14 KW - alkylidene complexes KW - metathesis KW - rotation barrier KW - ruthenium N2 - The present work describes the robust synthesis of Ru alkylidene complexes (PCy3)2Cl2Ru=CHR – precursors for metathesis catalysts. Moreover, the dynamic behavior of complexes where R = 2-naphthyl and 2-thienyl was studied. 1H NMR techniques were employed to establish the preferred conformations in solution for both complexes and the energy barrier for rotation around single (Ru=)CH–C(thienyl) bond was estimated (ΔG≠303K = 12.6 kcal/mol). ER -