Synthesis and Application of Novel Ruthenium Catalysts for High Temperature Alkene Metathesis

Catalysts

Jean I. du Toit¹  Cornelia G. C. E. van Sittert¹  Johan H. L. Jordaan¹  Hermanus C. M. Vosloo¹  Tegene T. Tole¹ 

[1] Research Focus Area for Chemical Resource Beneficiation, Catalysis and Synthesis Research Group, North-West University, Hoffmann Street, 2531 Potchefstroom, South Africa;

关键词: alkene metathesis;    hemilabile ligand;    pyridinyl alcohol;    ruthenium carbene;    Grubbs-type precatalyst;    1-octene;   

DOI  :  10.3390/catal7010022

来源: DOAJ

【 摘 要 】

Four pyridinyl alcohols and the corresponding hemilabile pyridinyl alcoholato ruthenium carbene complexes of the Grubbs second generation-type RuCl(H2IMes)(O^N)(=CHPh), where O^N = 1-(2′-pyridinyl)-1,1-diphenyl methanolato, 1-(2′-pyridinyl)-1-(2′-chlorophenyl),1-phenyl methanolato, 1-(2′-pyridinyl)-1-(4′-chlorophenyl),1-phenyl methanolato and 1-(2′-pyridinyl)-1-(2′-methoxyphenyl),1-phenyl methanolato, are synthesized in very good yields. At high temperatures, the precatalysts showed high stability, selectivity and activity in 1-octene metathesis compared to the Grubbs first and second generation precatalysts. The 2-/4-chloro- and 4-methoxy-substituted pyridinyl alcoholato ligand-containing ruthenium precatalysts showed high performance in the 1-octene metathesis reaction in the range 80–110 °C. The hemilabile 4-methoxy-substituted pyridinyl alcoholato ligand improved the catalyst stability, activity and selectivity for 1-octene metathesis significantly at 110 °C.

【 授权许可】

Unknown