Formation intermolecular

Complex coacervation in aqueous solution may be considered as a special case of network formation. Intermolecular forces such as Coulomb, van der Waals, hydrophobic, hydrogen bond, and dipol-charge transfer between polymers themselves, or polymers and low... 

After the radical formation, intermolecular chain transfer reactions take place. A special case of chain transfer is the propagation reaction (see Section 2.1) of the type ... 

Griesbeck, A. G., Bondock, S. Oxetane formation intermolecular additions. CRC Handbook of Organic Photochemistry and Photobiology... 

By definition, cross-linking involves the formation intermolecular connections through chemical bonds. This process necessarily results in reduction in chain mobility. Consequently, Tg increases. For lightly cross-linked systems like vulcanized rubber, Tg shows a moderate increase over the uncross-linked polymer. In this case, Tg and the degree of cross-linking have a linear dependence, as shown by the following approximate empirical equation. 

Chelate-assisted C-H bond aminations often require the presence of an oxidant in analogy to the previously discussed C-H oxygenations. Therefore, many protocols use a mixture of amine source and oxidant as reagents in order to achieve C-N bond formation. Intermolecular directed C-H aminations have been realized with this approach by Che and coworkers (Scheme 23.36). Remarkably, this methodology is capable of employing a variety of different directing groups as well as primary amides as amine sources [129]. 

Many other agents promoting oxidative coupling catalyze the gelation process. It has therefore been proposed that an oxidative coupling process could be involved (45). The gel formation process is in all circumstances a three-stage one complex formation—> intermolecular bridge formation—>gel formation. 

SCHEME 7.20 Carbonyl ylide formation/intermolecular cycloaddition sequence by Hodgson et al. 

SCHEME 7.22 Carbonyl ylide formation/intermolecular cycloadditions of ester-derived carbonyl ylides with DMAD. 

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