Resonance effect in Hammett relation. IV. Linear free energy based on the normal substituent constants was written by Yukawa, Yasuhide;Tsuno, Yuho;Sawada, Masami. And the article was included in Bulletin of the Chemical Society of Japan in 1966.Recommanded Product: 587-88-2 This article mentions the following:
A set of normal substituent constants, σ0, was derived from the rates of alk. hydrolysis of m- and p-substituted Et phenylacetates in 60% Me2CO at 25.0°. The values of the σ0 constants obtained were generally identical with Taft’s values within exptl. uncertainty. On the basis of the derived σ0, substituent effects on the general electrophilic reactions were related excellently by the equation log k/k0 = ρ(σ0 + rΔ σR+), where ΔσR+ corresponds to the exaltation of Brown and Okamoto’s σ+ from σ0 (CA 53, 9120f). Similar treatment could also be applied to the nucleophilic reactions. The utility of this equation for the estimation of resonance contribution and for the consideration of reaction mechanisms is discussed. In the experiment, the researchers used many compounds, for example, Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2Recommanded Product: 587-88-2).
Ethyl 2-(4-fluorophenyl)acetate (cas: 587-88-2) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Recommanded Product: 587-88-2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics