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locants 1 and 2. It is printed in italic type, and is often abbreviated as o pound names. For example, pound name orthoxylene is equivalent to oxylene. Tri may refer to: Cyclen or 1, buy ortho tri cyclen xr generic4, buy geeneric ortho tri cyclen htm7, buy no pre deletedion generic ortho tri cyclen10tetraazacyclododecane is a macrocycle and the aza analogue of crown ethers. Derivatives of cyclen are larger cyclic polyamines but the repeating unit (etyleneimine) is always the same. Like crown ethers, pounds are capable of selectively binding cations. They are used as a ligand in chemistry for instance with chemicals used in MRI contrast agents. ponds can be synthesized bining two separate parts by nucleophilic displacement . In this re the terminal amine groups in diethanolamine (2) are activated as electrophile by converting them into tosyl leaving groups. The two segments are joined in dimethylformamide and unless the reactants are very diluted, ordinary polymerization will take place to long linear chains and not cyclization. In the final step the tosyl groups are removed with sulfuric acid. High dilution conditions result in a low reaction rate penalty and this disadvantage is removed in an alternative re starting from etraamine and dithiooxamide to a amidine followed by proton abstraction with sodium alkoxide. The alcohol end groups in diethanolamine (2) are activated as electrophile by converting them into tosyl leaving groups. The two segments are joined in dimethylformamide and unless the reactants are very diluted, buy ortho tri cyclen generiic on sale ordinary polymerization will take place to long linear chains and not cyclization. In the final step the tosyl groups are removed with sulfuric acid. 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