Reactivity of groups

Regarding the substituent effect on reactivity of groups in positions 4 and 5 there is little information in the literature. The reactivity of halogen in position 5 seems to be increased when an amino group is present in position 2. Substitution products are easily obtained using neutral nucleophiles such as thiourea, thiophenols, and mercaptans (52-59). 

Zsako [519] accepts certain points in Gam s reappraisal of compensation behaviour but stresses that the existence of a linear relation between log A and E is a more general characteristic. Thus, while a physical interpretation for obedience to eqn. (21) cannot at present be provided, the relationship provides parameters which are useful in describing the reactivities of groups of related rate processes. 

Synthesis, Structure and Reactivity of Group 13/15 Compounds Containing the Heavier Elements of Group 15, Sb and Bi... 

One difference between water and liquid ammonia involves the reactivity of group IA metals. For example, potassium reacts very vigorously with water,... 

The classification of radical reactions carried out in this way makes it possible to observe empirically (on the basis of the parameter bre) the structural differences between the reactants within one class, to compare the classes and groups of reactions in terms of reactivity (in terms of the parameter Z>re or Ee0), and to identify the physical and structural factors determining the reactivities of groups and classes of reactants. 

If we consider that equimolar quantities of reactants AA and BB react and that the reactivity of groups A or B remains unchanged at all stages of conversion. Then the degree of polymerisation changes with the extent of polymerisation that has occurred and the probability factor can give an idea about the Molecular weight distribution at a particular conversion p as under. 

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