1998年11月5日 · CF3H / tBuOK as trifluoromethylating reagent In order to identify the trifiuoromethylating moiety, a low temperature 19F NMR study has been carried out. A solution …

2) Compilation of reported F19 NMR chemical shifts, 1951 to mid-1967 by Claude H. Dungan and John R. Van Wazer. Negative shifts are those that appear upfield of CFCl3 and positive shifts …

2017年7月13日 · We demonstrate that a highly reactive CF 3– adduct can be synthesized from alkali metal hydride, HCF 3, and borazine Lewis acids in quantitative yield at room …

2012年12月7日 · Here, we report on a direct trifluoromethylation protocol using close to stoichiometric amounts of CF 3 H in common organic solvents such as tetrahydrofuran (THF), …

2021年5月14日 · The mechanism of CF2 transfer from TMSCF3 (1), mediated by TBAT (2-12 mol %) or by NaI (5-20 mol %), has been investigated by in situ/stopped-flow 19F NMR …

2016年9月16日 · Electronegative substituents, as well as carbonyl groups or other functional groups on the carbon ß to a CF 3 group will be seen to shield its fluorines. The chemical shifts …

1979年11月20日 · We now report F and 31P NMR spectroscopic characterisation of CF3 PCF2 which confirms the phosphaalkene mechanism for the alkaline hydrolysis of (CF3 )2 PH. The …

2013年1月31日 · In an interesting example of a molecule containing two CF (3) groups getting simultaneously involved in hydrogen bond, where hydrogen bond mediated couplings are not …

Fluoroform (CF3H) is one the most simple and cheap sources of trifluoromethyl group. In this review, we briefly summarize some important research and development efforts in past two …

2006年11月30日 · 2) Compilation of reported F19 NMR chemical shifts, 1951 to mid-1967 by Claude H. Dungan and John R. Van Wazer. Negative shifts are those that appear upfield of …