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Chapter 4: Q27P (page 223)
Write an equation for the reaction of vitamin E with an oxidizing radical (RO路) to give ROH and a less reactive free radical.
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(a) Draw the structure of the transition state for the second propagation step in the chlorination of methane.
Show whether the transition state is product-like or reactant-like and which of the two partial bonds is stronger.
(b) Repeat for the second propagation step in the bromination of methane.
When ethene is treated in a calorimeter with H2and a Ptcatalyst, the heat of reaction is found to be -137kJ/mol(-32.7kcal/mol), and the reaction goes to completion. When the reaction takes place at 14000K, the equilibrium is found to be evenly balanced, with Keq=1. Compute the value of 螖厂for this reaction.
(a) Compute the heats of reaction for abstraction of a primary hydrogen and a secondary hydrogen from propane by a fluorine radical.
(b) How selective do you expect free-radical fluorination to be?
(c) What product distribution you expect to obtain from the free-radical fluorination of propane?
Question: Draw Lewis structures for the following free radicals.
(a)The ethyl radical, CH3-CH2
(b)The tert butyl radical, (CH3 )3C
(c)The isopropyl radical,(2-propyl radical)
(d)The iodine atom
Acetylacetone (pentane -2, 4-dione)reacts with sodium hydroxide to give water and the sodium salt of a carbanion. Write a complete structural formula for the carbanion, and use resonance forms to show the stabilization of the carbanion.
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