Bond dissociation energy values carbon-oxygen

Alcohols are heterolysed into carbocations and water in the presence of the hydronium ion (6). From the equilibrium constant the free energy of heterolytic dissociation of the carbon-oxygen a bond, AGSe,(ROH + H30+), can be calculated. The AG°het(ROH + H3O+) value is related to the pi R+ of the carbocation by (26). 

From these dai a Gray selected a set of best values for the heats of formation of alkoxy radicals, which are shown in Table 6. These heats of formation, when combined with the heats of formation of the alkyl radicals may be used to calculate the carbon-oxygen bond dissociation in the alkoxy radicals. Values are shown in Table 6. In addition, these heats of formation of alkoxy radicals may be combined with similar data for the alcohols and ethers to obtain bond dissociation energies i)(R—OH), i>(RO—H) and D(R—OR ). These derived energies are given in Table 7. 

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