Dicyclopentadiene dicarboxylic acid

Figure 6-11. 1 -H-Benzotriazole, 2,5-bis(N-pyridyl)-1,3,4-oxadiazole, cyclohexylammonium benzoate, benzylsulfonylacetic acid, 2,4-diamino-6-mercapto pyrimidine, hydroxamic acid, 3-phenyl-2-propyn-1-ol, dicyclopentadiene dicarboxylic acid.

Dibasic salts of dicyclopentadiene dicarboxylic acid are claimed to be active as corrosion inhibitors [444], Certain salts of fatty acids (metal soaps), together with benzotriazole, are claimed to give synergistic effects for corrosion in antifreeze-agent formulations [446]. 

J. W. Darden and E. E. McEntire. Dicyclopentadiene dicarboxylic acid salts as corrosion inhibitors. Patent EP 200850, 1986. 

More recently published ideas include the formation of solid derivatives of alkyl azides by treatment with acetylene dicarboxylic acid to form 1-alkyl-triazole-4,5-dicarboxylic acids. These frequently form hydrates with poor melting points and generally poor analytical properties. Alternatively, one can obtain bicyclic fused-ring triazolines by treatment with norbornadiene or dicyclopentadiene °. 

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