Reactions From Unsaturated Molecules by F or Cl Atoms

Displacement Reactions from Unsaturated Molecules by F or Cl Atoms 

The translational energy distributions for all of Herschbach s and for part of Lee s work were measured by direct velocity analysis. For some of Lee s work, the r were obtained by just fitting the measured angular distributions. However, these data should be reliable because the velocity distributions of the reagent beams were very narrow. A very careful study was done of the F + benzene-rfs reaction with velocity analysis of the fluorobenzene product at numerous laboratory angles. The results from the product velocity analysis were identical to those deduced from angular distributions without aid of velocity analysis. 

The energy distributions for the vinylic reactions have been interpreted in terms of a mechanism that involved addition of Cl to the jS-carbon (i.e., the CH2 end) of CH2=CHBr followed by three-centered migration of Cl and displacement of Br. In fact, the migration step may 

The value of 14 kcal mole advocated in ref. 152 was used in this table earlier work used enters directly into assigning the experimental distribution, a self-consistent must be used. These reactions can form two or more fluorobutene isomers the listed iE should be within 1 

11 kcal moIe (see also Section 2.6.2). Since 5 kcal mole of the mean of the two channels. 

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