For ethyl benzoate

Fig. 11 Excess acidity plot against X for the hydrolyses of some esters in aqueous H2S04 at 25°C for methyl benzoate (closed circles), data from ref. 41, and for ethyl benzoate (open circles), data from ref. 210, showing the reaction with two water molecules. PCT, protonation correction term.

Clearly with ratios of khyJkt.yeh in the region observed for ethyl benzoate under these conditions, the rates and activation parameters are largely determined by the addition step. And in this case at least the small rate decrease due to the breakdown step is entirely an entropy effect. In several instances, notably the hydrolyses of methyl and substituted benzyl benzoates, phthalide and y-butyrolactone. kh>rt > kcsch. since no concurrent oxygen exchange could be detected on alkaline hydrolysis212-3". ... 

The 13C NMR spectrum for ethyl benzoate contains these peaks 17.3,... 

FIGURE 15.1.2.2.1 Logarithm of mole fraction solubility (In x) versus reciprocal temperature for ethyl benzoate. 

A great deal of data are available for ethyl benzoate (EB), since this aromatic ester is the most widely used in patent and scientific literature dealing with high yield catalysts for propylene polymerization. 

The value of Vm for ethyl benzoate C9H10O2 calculated from Kopp s values is (9xll)+(10x5-5)+7-8+12-2=174-0, from Le Bas s values (9x 14-8)+(10x3-7)+7-4+12-0-15=174-6. The observed value is 174-6. 

The NMR spectrum for ethyl benzoate contains these peaksy 17.3, 61.1, 100-150 o.p.m. (four peaks), and 166.8 p.p.m. Which peak belongs to which carbon atom ... 

There are many aniline-related esters. Some are known as sunblocking agents, others as local pain killers, and yet others as food flavorings. Yet however diverse and important these species may be, their thermochemistry is quite sparse. We find only the enthalpy of formation of ethyl p-aminobenzoate from our archive. There is no enthalpy of formation value for ethyl benzoate to compare it to. 

The hydroi/ exch ratio is 0-21 in base, compared to 4-8 for ethyl benzoate under the same conditions (Bender, 1951). Thus the ease of removal of a leaving group from the intermediate is OH- > NH2, again in accord with their relative anionic stability, whilst for the ester intermediate it is OB- > OH- which is the opposite order to their stabilities. It was suggested that the steric requirements of the —OR group might be the cause of this anomaly. 

Figure 9.42. DEFT results for ethyl benzoate. (aHc) CHj, CHj, and CH subspectra,...

A number of correlations involving linear relationships between pre-exponential factors and activation energy are widely quoted for reactions on surfaces, as we shall see in the next chapter. This behavior, commonly termed the compensation effect implies a linear relationship between A7/ and A5. An exact linear relationship between A77 and TAS means that there is no variation in AG for the series. An example of this for a liquid-phase reaction is given by Fairclough and Hinshelwood for ethyl benzoate hydrolysis [R.A. Fairclough and C.N. Hinshelwood, J. Chem. Soc., 1573 (1937)]. 

The benzonoate end-groups absorb at X =230 nm (like the low molecular-weight benzoates) thus as -suming that for ethyl benzoate is equal to e of... 

The rate of this reaction is 10 larger than for ethyl benzoate. The reaction is base-catalyzed and as expected in the presence of H20 instead of H2O solvent, the rate is reduced by a factor of at least two (/chAd = 3.5). Thus, proton-transfer occurs in the transition state and the analogy with a-chymotrypsin acylation is apparent. 

The creation of surface Mg ions which form the adsorption sites for ethyl benzoate and TiCU can be envisaged. Three different types of surface Mg ions are present in the MgCU crystal ... 

The protocol for the preparation of a catalyst from the patent literature is MgCl2/EB/PC/AlEt3/TiCl4-AlEta/MPT where EB, PC, and MPT are abbreviations for ethyl benzoate, p-cresol and methyl-/ -toluate, respectively. 

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