Imines thermochemistry

We acknowledge that although thermochemical estimates will occasionally be used in the current study, we forego the results from quantum chemical calculations largely in the name of brevity. We are forced to use benzalaniline (XIII), there being no enthalpy of formation known for its acyclic counterpart CH2=CH-CH=N-CH=CH2, for either of its isomers CH2=CH-CH=CH-CH=NH and CH2=CH-CH=CH-N=CH2, nor an unequivocal measured value for CH2=NH or any of its methylated derivatives (see the summaries of imine thermochemistry [21, 22]). We additionally note that benzalaniline, taken as its trans-isomer like its hydrocarbon counterpart stilbene (XII), is a conventional,... 

These data should allow us to derive the desired enthalpy of formation of the iminyl radical. The problem is that the two results differ by ca 100 kJmol M The effect of substituents on the thermochemistry of oximes, their ethers and related imines are not so well-established for us to attempt deciding between these two bond energies. 

Imidazoles—see Benzimidazoles Imides—see Polyimides Imine iV-oxides, thermochemistry of 233 Imino dyes 950... 

Reviews by Gorte et al. [45,46] deal with file adsorption complexes formed by strong and weak bases wifii acid sites in zeolites. Among strong bases, these works examine the thermochemistry and adsorption enthalpies of a series of molecules similar to ammonia, i.e. alkylamines, but also pyridines and imines. Concerning weak bases, studies of the adsorption properties of water, alcohols, thiols, olefins, aldehydes, ketones and nitriles are taken into account. The authors report a poor correlation between the differential heats of adsorption on a H-MFI zeolite and enthalpies of protonation in aqueous solutions, but a much better correlation with gas-phase proton affinities [46]. 

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