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Title: Approaches to the synthesis of azonia-azulenes
Author: Cliff, Geoffrey R.
Awarding Body: Keele University
Current Institution: Keele University
Date of Award: 1971
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Two approaches to the azonia-azulenium system are described. In Part I the preparation of a number of azepinoindoles by the thermal decomposition of 2-azidodiphenylmethanes is described. The usual products were lOH-azepino[l.2-a]indoles and the compound previously reported as llH-azepino[l,2-a]indole has been shown to exist in the tautomeric lOH-form. In one case steric obstruction led to the formation of a 6H- and an 8H-azepinoindole, and when a 2'-methoxyl group was present in the azide the major products were acridines and acridans. A mechanism is proposed which satisfactorily accounts for the observed products. l-(2-Azidophenyl)-1-phenylethanol decomposed to give some 2-acetyldiphenylamine showing another nitrene insertion. pathway. Photolytic decomposition of 2-azidodiphenylmethane gave the azo-compound. Azepino[l.2-a]indol-8-one has been prepared in good yield and converted into hydroxy- and ethoxyazepino[l,2-a]indolium salts. In Part II the reduction of indolizine and some substituted indolizines by dissolving metals is shown to give dihydro- and tetrahydroindolizines. Attempts to add carbenes to dihydroindolizines and thus to produce the 5,7 ring system of the azonia-azulenes by ring expansion were unsuccessful.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry