Reactivity transfer

A few examples of reactivity transfer through more than three carbon atoms are also known (a -synthon N. Miyaura, 1975, 1976). 

Which MSAs should be selected (e.g., physical/reactive transfer, which solvents, adsorbents, etc.) ... 

This statement has its limitations. Ionic polymerization in hydrocarbons is always kinetically complicated, it often starts only after the addition of a polar compound (co-initiator), and it is affected by the aggregation of initiating and propagating particles. In strongly polar media, activation of initiator by dissociation of acids and bases is easy. Such solvent is simultaneously a reactive transfer agent. Propagation usually does not occur, and only low molecular products are formed. Exceptions can, of course, be found. During anionic polymerization of lactams in DMF, the solvent only increases the amount of dissociated initiator [27]. 

Anionic polymerizations can be terminated by acids, but when the conjugated base is sufficiently reactive, transfer may occur [44]... 

Several research groups have successfully applied this mode of radical cation formation in very elaborate studies, for example, on sulfur-containing methionine derivatives and small peptides [85, 86, 116]. These include interesting information on reactivity transfer within larger molecular structures which is often closely tied to the possibility of establishing a 2cr/lo- bond between the initially oxidized sulfur and a neighboring functional group (e.g. carboxyl or amino). 

The time delay of the heat transfer to the coolant and moderator water is an important factor in the mechanism of coupled neutronic and thermal-hydraulic instability. The Super LWR is a reactor system with a positive density coefficient of reactivity and a large time delay constant. If there is no time delay, a decrease in density would cause a decrease in power generation, which suppresses any further decrease in density, stabilizing the system. However, if there is a large time delay, it causes a decrease in the gain of the density reactivity transfer function, and reduces the effect of density reactivity feedback, making the system less stable. The time delay of the heat transfer to the water rods is much larger than that to the coolant. Thus the reactor system becomes less stable when the water rod model is included than the case without it. 

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