Primary interfering reaction

Figure 2.2 Theoretical kinetic curves for interfering reactions (primary 1 and secondary 2) of extreme (a) and asymptotic (b) type A is the phase shift.

Primary interference reactions. These are nuclear reactions on elements other than the element to be determined which yield the same indicator radionuclide. For example, silicon is determined by the 28Si(, >)28Al reaction. However, the same indicator radionuclide is produced from phosphorus by the 31P(w,a)28Al reaction. Hence, a high phosphorus abundance in a sample will lead to erroneously high values for silicon. Corrections may be applied to the data if concentrations of the interfering elements can be determined independently. 

The absence of any influence by ethylene glycol on the properties of Pr1,2 and I bo does not exclude, however, that differential influences on the kinetics of individual reaction steps may be operative. And indeed, the ratio I 00 1200 proved to be clearly independent of temperature in the presence of ethylene glycol, whereas it changed with temperature otherwise (Figure 21). The additive evidently exerts some control in the first step, possibly by interfering in the phytochromobilin-binding protein domain which determines the rate of formation, and hence the ratio, of the two primary photoproducts. It should be noted that this interference does not change the total photochemical conversion of the P components. 

This chapter shows practically all kinds of possible reaction interactions, which part may be united in a general idea of interference of chemical reactions. The notion of interference includes mutual intensification or weakening of the reactions for instance, the rate of primary reaction product formation decreases, whereas the rate of secondary, conjugated reaction product formation increases. Currently, the mutual influence of reactions synchronized in time and space will be taken for interfering chemical processes [1-3]. 

Our attention was drawn to photolytic radical generation with hexamethylditin because it showed promise in Kim s prior work with C=N radical acceptors, which included additions of primary radicals [54—60]. Adapting Kim s photolysis conditions, with hexamethylditin in the presence of InCl3, ethyl and isopropyl additions to hydrazone 3a occurred in reasonable yield [48]. Unfortunately, a carbonyl exchange side reaction [46] with acetone (used as a sensitizer under Kim s conditions) interfered with further development of this reaction. 

Triazines act by interfering with photosynthesis and it seems clear that, like the substituted urea herbicides, the primary site of action is inhibition of the Hill reaction of photosynthetic electron transport. 

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