Comparison of the Bond Strengths

The O—0 bond in CeHsO—OH is calculated to be 24.32 kcal mof while CH2=CHO—OH bond is 23.03 kcal mof showing a difference of 1.3 kcal mof This difference is found again in the peroxy systems as the CeHsO—O bond energy is 40.85 kcal mof while CH2=CHO— 0 bond is 39.65 kcal mof  

3 Similarities between the Potential Energy Surface of C HsOO and CH2=CHOO  

A comparison of the calculated potential energy surface (PES) for the dissociation reaction of phenylperoxy (CeHsOO ) to phenoxy + oxygen atom (CeHsO + O) versus the O—O bond distance against the corresponding vinylperoxy system (CH2=CHOO CH2=CHO + O) was performed. The O—O distance was scanned at steps of 0.1 A (or less) for both systems allowing the optimization of the structure for each O—O distance [190, 191, 192, 193]. 

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Consideration of the nature of the Si-H bond provides insight into the chemical behavior of organosilicon hydrides. Comparison of the bond strengths as... 

The data in Table XX permit an assessment of the donor strength of the new isopropylideneimino ligand.20,52 Comparison of the bond lengths between the two chelate families (Table XX) clearly indicates stronger... 

The EDA results for the complexes (CO)4Fe-EMe (Table 13.21) are very similar to those of (CO)4Fe-EPh (Table 13.20). This means that the methyl and phenyl groups behave as weak rr-donor groups. A comparison of the bonding analysis of the homoleptic complexes Fe(EMe)5 (Table 13.22) with the results of the heteroleptic species (CO)4Fe-EMe (Table 13.21) shows that the BDEs of the former are higher than those of the latter. The EDA data suggest that the higher bond strength of... 

The greater strength of the Hg—Hg bond in Hgjjcompared with Cd—Cd in Cd + is reflected also on comparison of the bond energies HgH+ >CdH + in the spectroscopic ions, and qualitatively the stability of Hg + is probably... 

Table 1.7 Comparison of the Bond Angles and the Lengths and Strengths of the Carbon-Carbon and Carbon-Hydrogen Bonds in Ethane, Ethene, and Ethyne...

In comparison with riboflavine, the quantum yield for the photoreduction of lumiflavine is very low, indicating that the n-ribityl group also contributes to the lowering of the bond strength of water. Although the structure of the riboflavine-water-activator complex has not yet been elucidated in detail, there is evidence that the 2-hydroxyl group of the D-ribitol residue may be involved. 

Comparison of the bonds present in the O-alkylation product with those in the C-alkylated ketone show that the ketone is considerably more stable because of the strength of the carbonyl bond ... 

The reduction of an alkene to an alkane is an exothermic process. This observation is consistent with the fact that, during hydrogenation, there is net conversion of a H—H bond and a weaker tt bond to stronger a bonds that is, one cr bond (H—H) and one tt bond (C=C) are broken, and two new cr bonds (C—H) form. For a comparison of the relative strengths of cr and tt bonds, refer to Section 1.10. 

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