Propagation pathway

The FeCU-initiated oxidative polymerizations of both 2,2-bis[4-(l-naphth-oxy)]phenyl propane (321) and 2,2-bis[4-(l-naphthyl)phenyl] propane (382) involve two different propagation pathways [215]. If the oxidative polymerization of 2,2-bis[4-(l-naphthoxy)]phenyl propane proceeded like the other bis(l-naphthoxy) monomers (see Figs. 43 and 44) the polymer repeat unit would contain an isopropenylidene group linking two phenyl groups (Fig. 54). 

Factors Influencing Propagation Pathways (abstraction vs. scission reactions vs. rearrangement) of LOO and LO ... 

All the pathways outlined above eventually lead to H abstraction to form intermediate products that then breakdown to secondary products. Why, then, is the distinction between propagation mechanisms important, other than as an academic exercise The answer is that shifting among propagation pathways critically affects the kinetics of oxidation, whether determined by oxygen consumption or appearance of specific products, and can induce large differences in the ultimate mix of products, particularly volatiles. This has several important implications and consequences. The first is analytical. If the dominant pathway is not being monitored, an... 

Seyedsayamdost, M. R., Yee, C. S., Reece, S. Y., et al. (2006) pH rate profiles of FnY356-R2s (n = 2, 3,4) in Escherichia coli ribonucleotide reductase Evidence that Y-356 is a redox-active amino acid along the radical propagation pathway. Journal of the American Chemical Society, 128(5), 1562-1568. 

Efficient propagation pathways of ring-opening polymerization of methyl-enecyclobutane [87] and methylenecyclopropane [88, 89] involve (3-carbon elimination at electrophilic metal centers like zirconium and samarium. 

This kind of plant design is also called single error forgiving or error tolerating design. For this purpose of identifying the error propagating pathways this qualitative use and evaluation of a fault tree analysis is especially suitable. 

Haglund, M.M. Optical imaging of visual cortex epileptic foci and propagation pathways. Epilepsia 53(sl), 87-97 (2012)... 

Actually, this acylation reaction may involve the endo- as well as the exocyclic carbonyl of the terminal acyl lactam consequently, two propagation pathways are possible. Moreover, since the bimolecular aminolysis of N-acyl lactam may be schematized via formation of a tetrahedral intermediate, four pathways [21]-[22]-[23]-[24] are possible and amidine stmc-tures (21, 23) may be obtained as well (Scheme 9). 

Scheme 9 Possible propagation pathways and structures originated therefrom in lactam cationic polymerizations.

Scheme 12 Propagation pathways based on lactamolytic mechanism.

Scheme 13 Propagation pathway based on the ion-coordinative mechanism.

Epileptiform activity does not spread randomly throughout the brain, but seems to be generated and propagated by specific anatomical routes (Gale, 1988 Loscher and Ebert, 1996). This suggests ftiat certain propagation pathways may fimction as common denominators for the development of certain t5q>es of epileptiform activity, independent of the ways seizures are triggered. Within the rat brain, there are areas with control mechanisms able to attenuate all aspects of convulsive activity. The localization of such control areas... 

Scheme 1.2 Comparison of cationic and anionic propagation pathways in the ROP of heterocyclic monomers.

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