inert to further reaction. In contrast, with 2, para-HDF of C5F5N is preferred, and moreover, the 2,3,5,6-C5F4HN regioisomer undergoes C–H bond activation to form the catalytically inactive 16e Ru-fluoropyridyl complex Ru(IMes)(PPh3)(CO)(4-C5F4N)H, 3. Density functional theory calculations rationalize the different regioselectivity of HDF of C5F5N at 1 and 2 in terms of a change in the pathway that is
我们描述了在两个Ru(NHC)处对
氟吡啶C 5 F 5– x H x N(x = 0–2)进行催化加氢脱
氟化(HDF)的范围,区域选择性和机理的组合实验和计算研究。PPh 3)2(CO)H 2催化剂(NHC = IPr,1和IMes,2)。HDF的区域选择性和程度显着取决于NHC的性质:在邻位偏爱1 HDF的C 5 F 5 N会得到2,3,4,5-C 5 F 4。HN为主要产品。这会与3,4,5-C 5 F 3 H 2 N和2,3,5-C 5 F 3 H 2 N发生反应,后者也可以进一步进行HDF至3,5-C 5 F 2 H 3 N和2,5--C 5 ˚F 2 ħ 3 N.段的ç-HDF 5 ˚F 5 N也看到并给出2,3,5,6--C 5 ˚F 4 HN作为次要产物,然后将其对进一步反应呈惰性。相反,对于2,C 5 F 5的对-HDFN是优选的,此外,2,3,5,6-C 5 F 4 HN