Isocyclic dimerization

Synthesis, purification and identification of cyclopentanporphyrins and their chemical dimers covalently linked via isocycles have been described in previous papers (17,19-23). The porphyrins with the cyclopentanone ring have been prepared by familiar methods (24-26). 

In complete contrast to metalloporphyrins, the analogous metallochlorins showed no attractive interactions whatsoever. An important assembly occurred in the case where the keto oxygen of the isocyclic ring in chlorophylls bound to the central magnesium ion of another molecule. Dimers with an interplanar separation of 4.2. 7 A were formed. A series of earlier papers handled the characterization of such dimers by H-NMR and IR spectrosco-pies o ei, their behaviour has been compared with covalently connected dimer... 

Nitropropane as reagent 22, 288 suppl. 26 2-Nitrosamine dimers, isocyclic... 

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