An Azulene Analogue of the Tripyrranes and Carbaporphyrinoids Therefrom Conjugated Macrocycles Related to the Porphyrins, Part 19. This work was supported by the National Science Foundation under Grant Nos. CHE-9732054 and CHE-0134472. Mass spectral determinations were made at the Mass Spectral Laboratory, School of Chemical Sciences, University of Illinois at Urbana-Champaign, supported in part by a grant from the National Institute of General Medical Sciences (GM 27029). Elemental analyses were obtained from the School of Chemical Sciences Microanalysis Laboratory at the University of Illinois. Part 18: ref. [1].