Cyclopentadienyl and pentamethylcyclopentadienyl ruthenium complexes as catalysts for the total deoxygenation of 1,2-hexanediol and glycerol
作者:Michelle E. Thibault、Domenico V. DiMondo、Michael Jennings、Patrícia Verardi Abdelnur、Marcos N. Eberlin、Marcel Schlaf
DOI:10.1039/c0gc00255k
日期:——
The ruthenium aqua complexes [cp*Ru(OH2)(N–N)](OTf) (cp* = η5-pentamethylcyclopentadienyl, N–N = 2,2′-bipyridine, phen = 1,10-phenanthroline, OTf− = trifluoromethanesulfonate) and the acetonitrile complex [cpRu(CH3CN)(bipy)](OTf) (cp = η5-cyclopentadienyl) are water-, acid-, and thermally stable (>200 °C) catalysts for the hydrogenation of aldehydes and ketones in sulfolane solution. In the presence of HOTf as a co-catalyst, they effect the deoxygenation of 1,2-hexanediol to 1-hexanol and hexane. Glycerol is deoxygenated to 1-propanol in up to 18% yield and under more forcing conditions completely deoxygenated to propene. The structure of the acetonitrile pro-catalyst [cpRu(CH3CN)(bipy)](OTf) has been determined by X-ray crystallography (space groupP (a = 9.3778(10) Å; b = 10.7852(10) Å; c = 11.1818(13) Å; α = 101.718(5)°; β = 114.717(4)°; γ = 102.712(5)°; R = 3.95%).
铑水合络合物 [cp*Ru(OH2)(N–N)](OTf)(cp* = η5-五甲基环戊二烯,N–N = 2,2′-联吡啶,phen = 1,10-菲啰啉,OTf− = 三氟甲磺酸根)和乙腈络合物 [cpRu(CH3CN)(bipy)](OTf)(cp = η5-环戊二烯)是能够在亚磺烷溶液中对醛和酮进行氢化反应的稳定催化剂,具有水、酸和热稳定性(>200 °C)。在HOTf作为助催化剂的情况下,它们能够将1,2-己二醇脱氧化为1-己醇和己烷。甘油的脱氧化产率可高达18%,在更严苛的条件下可完全脱氧化为丙烯。乙腈前催化剂 [cpRu(CH3CN)(bipy)](OTf) 的结构已通过X射线晶体学确定(空间群P(a = 9.3778(10) Å;b = 10.7852(10) Å;c = 11.1818(13) Å;α = 101.718(5)°;β = 114.717(4)°;γ = 102.712(5)°;R = 3.95%)。