H-Atom Abstraction by Bis trifluoromethyl Nitroxide in the Liquid Phase

H-Atom Abstraction by Bis(trifluoromethyl) Nitroxide in the Liquid Phase 

Convincing experimental evidence for QMT s involvement in any intermolecular H-atom abstraction in the liquid phase had not been presented and represented an interesting challenge in the 1980s (and to this day, so far as the author is aware). If H-atom tunneling is to be identified in the generalized reaction (28.18) 

Reaction (28.18) must be (relatively) rapid, i.e. X must be highly reactive and/or RH must be a good H-atom donor. 

X must be destroyed only by reaction (28.18), i.e. there must be 

The solvent must have an extremely low freezing point, as close to 77 K as is compatible with it being liquid over a wide range of temperatures. 

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