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Difluorocarbene is the chemical compound with formula CF 2. It has a short half-life , 0.5 and 20 ms, in solution and in the gas phase, respectively. [ 1 ] Although highly reactive, difluorocarbene is an intermediate in the production of tetrafluoroethylene , which is produced on an industrial scale as the precursor to Teflon ( PTFE ).
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The element has two crystalline forms at standard atmospheric pressure: a double-hexagonal close-packed form dubbed alpha (α) and a face-centered cubic form designated beta (β). [ b ] The α form exists below 600–800 °C with a density of 15.10 g/cm 3 and the β form exists above 600–800 °C with a density of 8.74 g/cm 3 . [ 17 ]
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The structure of fluorographene can be derived from the structure of graphite monofluoride (CF) n, which consists of weakly bound stacked fluorographene layers, and its most stable conformation (predicted for the monocrystal) contains an infinite array of trans-linked cyclohexane chairs with covalent C–F bonds in an AB stacking sequence. [7]
Carbon is stable in a fluorine atmosphere up to about 400 °C, but between 420-600 °C a reaction takes place to give substoichiometric carbon monofluoride, CF 0.68 appearing dark grey. With increasing temperature and fluorine pressure stoichiometries up to CF 1.12 are formed. With increasing fluorine content the colour changes from dark grey ...
In re Caremark International Inc. Derivative Litigation, 698 A.2d 959 (Del. Ch. 1996), [1] is a civil action that came before the Delaware Court of Chancery.It is an important case in United States corporate law and discusses a director's duty of care in the oversight context.
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