557-68-6Relevant articles and documents
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Lyons,J.E.
, p. 418 - 419 (1975)
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Thermochemical study of the liquid phase equilibrium reaction of dihalomethanes by NMR spectroscopy
Dávalos,Lago,Baer, Tomas
, p. 230 - 234 (2005)
The liquid phase equilibrium reaction of dihalomethanes (2CH2BrI ? CH2Br2 + CH2I2) has been investigated by NMR spectroscopy, as a function of the temperature and initial concentration of the reactants. The equilibrium constants have been experimentally determined for this reaction from the profile of the NMR spectra. Heat capacity measurements were carried out in the temperature range from 293.15 to 353.15 K by differential scanning calorimetry. The results relate the heats of formation of the three compounds and confirm the recently determined heat of formation of CH2I2 of 107.5 kJ mol-1.
Photodissiciation of a Molecule with Two Chromophores. CH2IBr
Lee, S. J.,Bersohn, R.
, p. 728 - 730 (2007/10/02)
When CH2IBr is dissociated with light in its first absorption band, which peaks at 258 nm, it is found that 86percent of the fragmentations yield I atoms and 14percent Br atoms.The anisotropy parameter, β, in the angular distribution is 1.42.This fact leads to two conclusions: (1) the dissociation process is direct, and (2) the Br atoms are formed as a result of a weaker absorption to a different upper state than that reached in the main absorption.
Carbon-Halogen Bonding Studies. Halogen Redistribution Reactions between Alkyl or Acetyl Halides and Tri-n-butyltin Halides
Friedrich, Edwin C.,Abma, Charles B.
, p. 1367 - 1371 (2007/10/02)
The equilibrium positions have been determined for the halogen redistribution reactions of tri-n-butyltin halides with a variety of structurally different types of alkyl halides and with acetyl halides.These have been related through the reaction ΔGo values to carbon-halogen bond dissociation energy differences.It is suggested that the trends observed in the latter may provide evidence for the existence of a small steric bond weakening effect in the order C-I > C-Br > C-Cl bonds on going from methyl to primary, secondary, and tertiary alkyl halides.On the other hand, with the 2,3-? bond containing allyl, benzyl, and propargyl halides , α-haloacetones, and haloacetonitriles, there may be some type of electronic carbon-halogen bond strengthening effect which lies in order C-I > C-Br > C-Cl.Finally, for the acetyl halides, the data are in agreement with increases in bond strengths resulting from ? contributions being in the order C-Cl > C-Br > C-I.
