Polycyclic polyamines

Macrocyclic (bicyclic and polycyclic) polyamine dispersants and viscosity index (VI) improvers... 

Fig. 2.5. Polycyclic polyamines and macrocyclic polyamines (crown ethers) as multifunctional oil additives...

Polyamine (Section 22 4) A compound that contains many ammo groups The term is usually applied to a group of nat urally occurring substances including spermine spermi dine and putrescme that are believed to be involved in cell differentiation and proliferation Polycyclic aromatic hydrocarbon (Section 118) An aromatic hydrocarbon charactenzed by the presence of two or more fused benzene rings... 

In contrast to the polycyclic indole, isoquinoline, or terpene alkaloids, the di- and polyamine alkaloids seem to be of much simpler construction. This first impression is misleading. Special structural features render this group of alkaloids even more difficult to handle than the above-mentioned ones. It should be noted that the structures of several polyamine alkaloids have had to be revised. Because of this, two main factors should be mentioned. (1) The alkaloids sometimes occur as mixtures that are very difficult to separate, and (2) the results from spectral or chemical analyses are equivocal (cf. references on structural elucidation in Section V). This group of alkaloids was the subject of several review papers (26-28) and especially covering the subject of synthesis (29-32). Some general aspects of the difficulties associated with the isolation and structure elucidation of the polyamine alkaloids are discussed. 

NIPU networks are created by the reaction between polycyclic carbonate oligomers and aliphatic or cycloaliphatic polyamines with primary amino groups [4], This forms a cross-linked polymer with p-hydroxy urethane groups of a different structure—polyhydroxyurethane polymer. Since NIPU is obtained without using highly toxic isocyanates, the process of synthesis is relatively safe for both humans and the environment in comparison to the production of conventional polyurethanes. Moreover, NIPU is not sensitive to moisture in the surrounding environment. 

Polyamides, 809-810 Polyamines, 870 Polychlorinated biphenyls, 938 Polycyclic hydrocarbons aliphatic, 114—116 aromatic, 408—409, 474—475 and cancer, 409 Polyesters, 809 Polyethers, 622-625... 

The DNA molecule is the primary target of many antitumour agents. Small molecules, which bind to DNA by intercalation, require polycyclic systems in their structure for efficient binding. Because of the symmetrical arrangement of the helical double strand, symmetry is found in the structure of DNA ligands. Polycyclic systems bearing symmetrical polyamine side chains, such as mitoxantrone ... 

Polychlorinated biphenyls (PCB) Polyamines Polycyclic aromatic hydrocarbons (PAH) Porphyrins Prostaglandins (thromboxanes)... 

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