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The <jats:italic>trans<\/jats:italic>-aminal derivatives cannot be used for preparation of cyclam or its derivatives due to exceptional stability of the aminal bridge. The different reactivity of both <jats:italic>cis<\/jats:italic>- and <jats:italic>trans<\/jats:italic>-aminals is discussed on the basis of the X-ray structures determined for a series of the cyclam derivatives and could be explained by steric hindrance in the <jats:italic>trans<\/jats:italic>-aminals. <\/jats:p>","DOI":"10.1135\/cccc20000243","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T13:01:29Z","timestamp":1027774889000},"page":"243-266","source":"Crossref","is-referenced-by-count":34,"title":["Crystal Structures and Reactivity of 3a,5a,8a,10a-Tetraazaperhydropyrene Derivatives. 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