Complexing agents condensation polymers

Platinum-group metals (qv) form complexes with chelating polymers with various 8-mercaptoquinoline [491-33-8] derivatives (83) (see Chelating agents). Hydroxy-substituted quinolines have been incorporated in phenol—formaldehyde resins (84). Stannic chloride catalyzes the condensation of bis(chloromethyl)benzene with quinoline (85). 

Applications of cationic dendrimers as transport vehicles have been described, with an emphasis on their use as transfection agents for nucleic acids. They can transfect them into a large number of cell lines and primary culture cells.Dendrimers with protonable amine groups can interact with all forms of nucleic acid by electrostatic interactions to form complexes that condense the nucleic acids. Whereas linear polymers often adopt random coil structures, the 3D structure of a dendrimer is characterized by radial symmetry. To solve many cellular obstacles of gene delivery, functionalization and variation of the dendrimer structure is an important tool that can be applied. These systems have shown stability and non-immunogenic properties for their potential use in a high variety of therapeutic applications and have been successfully used as carriers for nucleic acids and drug delivery. ... 

Modification of the protein amine groups is the procedure most frequently used to produce antibody-liposome conjugates. Early procedures used crosslinking agents, such as l-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) (27,28) in the presence of preformed liposomes containing a lipophilic carboxylic acid. Condensing agents like these tend to form protein-protein polymers. Control of these reactions is typically difficult and complex, and as a result separation of the liposomes from protein polymers is a... 

When zero-valent Ni complexes (Ni(O)Lm) are used as the condensing agent for dihalo monomers, the Ni(0)Lm/monomer ratio strongly alfects the molecular weight of the obtained polymers.Zn used for the Ni-catalyzed polycondensation is usually activated by treating with acids and dried before use. Characterization of the obtained polymers by GPC is described in the Section 4.2.7. 

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