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searching for Entropy of activation 9 found (22 total)

Sigma-bond metathesis (241 words) [view diff] exact match in snippet view article find links to article

the rate of the reaction is characterized by a highly negative entropy of activation, indicating an ordered transition state. For metals unsuited for

Sulfoxide (1,388 words) [view diff] exact match in snippet view article find links to article

racemization is in the range 35 - 42 kcal/mol and the corresponding entropy of activation is -8 - +4 cal/mol-K. The barriers are lower for allylic and benzylic

Α-Ketol rearrangement (1,281 words) [view diff] exact match in snippet view article find links to article

rearrangement to amino ketones. Hammett analysis and a very negative entropy of activation suggest that the reaction proceeds in a single step through a concerted

Cheletropic reaction (1,611 words) [view diff] exact match in snippet view article find links to article

permitting calculations of the enthalpy of activation (ΔH‡) and entropy of activation (ΔS‡) for these reactions through the Arrhenius equation. More recently

Chorismate mutase (1,354 words) [view diff] exact match in snippet view article find links to article

substrate restrict conformational degrees of freedom, such that the entropy of activation is effectively reduced to zero, and thereby promotes catalysis.

Wolff–Kishner reduction (4,211 words) [view diff] exact match in snippet view article find links to article

of the N-H bond more difficult. The exceptionally high negative entropy of activation values observed can be explained by the high degree of organization

Kinetic isotope effect (14,346 words) [view diff] exact match in snippet view article find links to article

pre-exponential factors AD/AH is not equal to 1. A large negative entropy of activation. The geometries of the reactants and products are usually very similar

Hydrogen-bond catalysis (4,562 words) [view diff] exact match in snippet view article find links to article

reactive conformation, and the enzyme-catalyzed reaction has near-zero entropy of activation, while typical Claisen rearrangements in solution have very negative

Metal ions in aqueous solution (7,653 words) [view diff] exact match in snippet view article find links to article

with a residence time between about 1 μs and 1 s. The enthalpy and entropy of activation, ΔH‡ and ΔS‡ can be obtained by observing the variation of rate