Dissociation intramolecular assistance

Certainly intramolecularly assisted dissociative reactions seem to occur quite frequently. 

The above value for R = H corresponds to an intermolecular process, either assisted by the solvent (in solution) or by other NH-pyrazole molecules (in solution and in the solid state) while metal migrations are probably intramolecular (the bigger the metal, the easier) and those of COR correspond (for R = NHR ) to a dissociation-recombination mechanism. Minkin [quoted in 96MI(15)339] suggests that a tautomeric process should... 

RNA chain termination in bacteria occurs by two mechanisms, one with assistance of a protein factor rho (p) and the other without need of a protein. In both cases, termination occurs at a specific terminator sequence in the gene, at which the RNA polymerase stops adding nucleotides to the growing RNA chain, which is then released from the template. The terminator sequence often has a hairpin structure which results from intramolecular base pairing in a palindromic sequence. It is likely that such hairpins at the end of RNA promote its dissociation from DNA. Termination can be prevented by an anti-terminator protein, which allows the polymerase to ignore the terminator signal. 

---