Syntheses and Reactivity of Analogues of Grubbs’ Second Generation Metathesis Catalyst with Fluorous Phosphines: A New Phase-Transfer Strategy for Catalyst Activation
作者:Rosenildo Corrêa da Costa、John A. Gladysz
DOI:10.1002/adsc.200600461
日期:2007.1.8
the bis(pyridine) complex (H2IMes)(Py)2(Cl)2Ru(=CHPh), (H2IMes=1,3-dimesityl-4,5-dihydroimidazol-2-ylidene) and the highly fluorophilic phosphines [Rfn(CH2)m]3P [1; m/n=a, 2/6; b, 2/8; c, 2/10; d, 3/8; Rfn=CF3(CF2)n−1] give (H2IMes)[Rfn(CH2)m]3P}(Cl)2Ru(=CHPh) (4a–d, 64–78 %), which are analogues of Grubbs’ second generation alkene metathesis catalyst. Complexes 4a,b are effective catalysts for conversions
双(吡啶)配合物(H 2 IMes)(Py)2(Cl)2 Ru(= CHPh),(H 2 IMes = 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene)与高氟膦[R f n(CH 2)m ] 3 P [ 1 ; m / n = a,2/6; b 2/8;c 2/10;d 3/8;R f n = CF 3(CF 2)n -1 ]给出(H 2 IMes)[R f n(CH 2)m ] 3 P}(Cl)2 Ru(= CHPh)(4a – d,64–78%),是Grubbs第二代烯烃复分解催化剂的类似物。络合物4a,b是在CH 2 Cl 2和CH 2 Cl 2中在单相和双相条件下将1,6-二烯转化为环戊烯的有效催化剂。/氟溶剂混合物。后者通常表现出速率加速,这被认为是由于离解的氟膦的相转移引起的,从而使底物更好地竞争十四价电子中间体。当Grubbs的第二代