Kinetic data for

Herein is the rate constant for a dienophile with substituent x ko is the corresponding rate constant for unsubstituted 2,4c Ox is the substituent constant for substituent x and p is the reaction constant, defined as the slope of the plot of log (k / ko) versus Ox. The parameter p is a measure of the sensitivity of the reactions towards introduction of substituents. Figure 2.3 and Table 2.4 show the results of correlating the kinetic data for the reaction of 2.4a-e with 2.5 with a. ... 

II Kinetic data for the range 84 4-92 3 % sulphuric acid are available. The relative rate was obtained as before. 

Other substituents which belong with this group have already been discussed. These include phenol, anisole and compounds related to it ( 5.3.4 the only kinetic data for anisole are for nitration at the encounter rate in sulphuric acid, and with acetyl nitrate in acetic anhydride see 2.5 and 5.3.3, respectively), and acetanilide ( 5.3.4). The cations PhSMe2+, PhSeMe2+, and PhaO+ have also been discussed ( 9.1.2). Amino groups are prevented from showing their character ( — 7 +717) in nitration because conditions enforce reaction through the protonated forms ( 9.1.2). 

The nitration of phenylpyridines and related compounds has attracted attention for a long time, and measurements of isomer proportions have been made for several compounds of this type. Nitration occurs in the phenyl ring. For 2-phenylpyridine and 2-phenylpyridine i-oxide measurements of the dependence of rate of nitration upon acidity in 75-81 % sulphuric acid at 25 °C show that both compounds are nitrated as their cations (table 8.1). The isomer distribution did not depend significantly upon the acidity, and by comparison with the kinetic data for quinolinium ( 10.4.2) the partial rate factors illustrated below were obtained.They should be compared with those for the nitration of 2-nitrobiphenyl ( 10.1). The protonated heterocyclic groups are much... 

Table III-52 indicates the kinetic data for quatemization of 2- and 4-alkylthiazoles. The 8 value shows that the 4-positioiH more sensitive than the 2-position to steric effects, the bond angle HjCjN (123°6) being greater than that of HjQN (119 4). This result has been confirmed for all solvents and leaving groups (256).

TABLE in-52. KINETIC DATA FOR THE OUATERNI-ZATION OF 2- AND 4-ALKYLTHIAZOLES WITH METHYL IODIDE IN NITROBENZENE AT 25°C (256)... 

The kinetic data for the action of plasmin on different substrates under various conditions have been summarized. The MichaeHs-Menten constant (iC ) varies between 10 and 1000 mAf and the catalytic constant between 1 and 75. ... 

Table 27 Kinetic Data for Autotrope Rearrangements in Pyrazoles...

It will be seen tliroughout this discussion of thermochemical processes tlrat these require a knowledge of botlr thermodynamic and kinetic data for their analysis, and while kinehc theory obviously determines the rate at which any process may be caiTied out, the thermodynamic properties determine the extent to which the process can occur. 

Table 11.1 Kinetic data for wild-type and mutant trypsins...

Vn. Appendix Kinetic Data for Nucleophilic Heteroaromatic Substitution. 359... 

The purpose of the present review is to indicate the methods that have been used to obtain quantitative equilibrium and kinetic data for this water-addition reaction and to discuss the results that have so far been reported. It is hoped that by describing some of the characteristics of this reaction recognition of further examples may be facilitated. 

The kinetic data for the structures in Schemes II and III lead to the following relationships of the rates of piperidino-dehalogenation (type of activation given in parentheses ind. = inductive activation, res. = resonance activation) ... 

A prospective method for the utilization of diacetylene by its conversion to 2-mercapto-4-methylpyridine via the reaction of l-methoxybut-l-en-3-yne with thiourea has been brought about at an industrial level (78USSRP570580 81USSRP791713 84MI2 00ZPK619). Kinetic data for this reaction and optimal synthetic parameters for the end product have been reported (84ZPK1801). 

An enzyme is produced for manufacturing a sun protection lotion. Given kinetic data for... 

Table 3.2 Selected Kinetic Data for Decomposition of Azo-Compounds ...

Table 3.6 Kinetic Data for Reactions of Carbon-Centered Radicals...

Table 3.9. Kinetic Data for Reactions of /-Butoxy Radicals in Various...

Various other heteroatom-centered radicals have been generated as initiating species. These include silicon-, sulfur-, selenium- (see 3.4.3.1). nitrogen- and phosphorus-centered species (see 3.4.3.2). Kinetic data for reactions of these radicals with monomers is summarized in Table 3.10. 

The second test for the mechanism shown in Scheme 8-8 is to apply equation (c) to (8-10) with kinetic data for dediazoniations with varying concentrations [N2] of molecular nitrogen. As the solubility of N2 is quite low in most solvents, kinetic measurements must be made under N2 pressure. The dediazoniation reaction has a... 

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