Tetrasubstituted cyclams of formulae (3,5-Me2C6H3CH2)4Cyclam and (4-MeC6H4SO2)4Cyclam were synthesized by reaction of cyclam with 4 equivalents of 3,5-dimethylbenzyl bromide and p-toluenesulfonyl chloride, respectively. Cyclam reacted with CO2 at atmospheric pressure to give (HOOC)4Cyclam, which displays four carbamic acid moieties. This reaction is reversible, and in aqueous solution a decarboxylation process takes place with formation of cyclam and release of CO2.
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The authors acknowledge Fundação para a Ciência e a Tecnologia, Portugal for funding this research work (UID/QUI/00100/2019).
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2021, 57(7/8), 871–874
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Alves, L.G., Munhá, R.F. & Martins, A.M. Synthesis and structural characterization of N,N',N'',N'''-tetrasubstituted cyclams. Chem Heterocycl Comp 57, 871–874 (2021). https://doi.org/10.1007/s10593-021-02994-4
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DOI: https://doi.org/10.1007/s10593-021-02994-4