Otte, Matthias

[["dc.bibliographiccitation.firstpage","3106"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","ACS Catalysis"],["dc.bibliographiccitation.lastpage","3112"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Kuijpers, Petrus F."],["dc.contributor.author","Otte, Matthias"],["dc.contributor.author","Dürr, Maximilian"],["dc.contributor.author","Ivanović-Burmazović, Ivana"],["dc.contributor.author","Reek, Joost N. H."],["dc.contributor.author","de Bruin, Bas"],["dc.date.accessioned","2021-04-29T10:11:23Z"],["dc.date.available","2021-04-29T10:11:23Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1021/acscatal.6b00283"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84573"],["dc.relation.issn","2155-5435"],["dc.title","A Self-Assembled Molecular Cage for Substrate-Selective Epoxidation Reactions in Aqueous Media"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4880"],["dc.bibliographiccitation.issue","17"],["dc.bibliographiccitation.journal","Chemistry: a European Journal"],["dc.bibliographiccitation.lastpage","4884"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Otte, Matthias"],["dc.contributor.author","Kuijpers, Petrus F."],["dc.contributor.author","Troeppner, Oliver"],["dc.contributor.author","Ivanović-Burmazović, Ivana"],["dc.contributor.author","Reek, Joost N. H."],["dc.contributor.author","de Bruin, Bas"],["dc.date.accessioned","2021-04-29T10:11:08Z"],["dc.date.available","2021-04-29T10:11:08Z"],["dc.date.issued","2014-04-22"],["dc.description.abstract","A cobalt-porphyrin catalyst encapsulated in a cubic M8 L6 cage allows cyclopropanation reactions in aqueous media. The caged-catalyst shows enhanced activities in acetone/water as compared to pure acetone. Interestingly, the M8 L6 encapsulated catalyst reveals size-selectivity. Smaller substrates more easily penetrate through the pores of the \"molecular ship-in-a-bottle catalysts\" and are hence converted faster than bigger substrates. In addition, N-tosylhydrazone sodium salts are easy to handle reagents for cyclopropanation reactions under these conditions."],["dc.identifier.doi","10.1002/chem.201400055"],["dc.identifier.pmid","24664657"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84569"],["dc.language.iso","en"],["dc.relation.eissn","1521-3765"],["dc.relation.issn","0947-6539"],["dc.title","Encapsulated cobalt-porphyrin as a catalyst for size-selective radical-type cyclopropanation reactions"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","10170-8"],["dc.bibliographiccitation.issue","31"],["dc.bibliographiccitation.journal","Chemistry: a European Journal"],["dc.bibliographiccitation.lastpage","10178"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Otte, Matthias"],["dc.contributor.author","Kuijpers, Petrus F."],["dc.contributor.author","Troeppner, Oliver"],["dc.contributor.author","Ivanović-Burmazović, Ivana"],["dc.contributor.author","Reek, Joost N. H."],["dc.contributor.author","de Bruin, Bas"],["dc.date.accessioned","2021-04-29T10:11:00Z"],["dc.date.available","2021-04-29T10:11:00Z"],["dc.date.issued","2013-07-29"],["dc.description.abstract","The synthesis of a new, cubic M8L6 cage is described. This new assembly was characterised by using NMR spectroscopy, DOSY, TGA, MS, and molecular modelling techniques. Interestingly, the enlarged cavity size of this new supramolecular assembly allows the selective encapsulation of tetra(4-pyridyl)metalloporphyrins (M(II)(TPyP), M = Zn, Co). The obtained encapsulated cobalt-porphyrin embedded in the cubic zinc-porphyrin assembly is the first example of a catalytically active encapsulated transition-metal complex in a cubic M8L6 cage. The substrate accessibility of this system was demonstrated through radical-trapping experiments, and its catalytic activity was demonstrated in two different radical-type transformations. The reactivity of the encapsulated Co(II)(TPyP) complex is significantly increased compared to free Co(II)(TPyP) and other cobalt-porphyrin complexes. The reactions catalysed by this system are the first examples of cobalt-porphyrin-catalysed radical-type transformations involving diazo compounds which occur inside a supramolecular cage."],["dc.identifier.doi","10.1002/chem.201301411"],["dc.identifier.pmid","23821458"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84567"],["dc.language.iso","en"],["dc.relation.eissn","1521-3765"],["dc.relation.issn","0947-6539"],["dc.title","Encapsulation of metalloporphyrins in a self-assembled cubic M8L6 cage: a new molecular flask for cobalt-porphyrin-catalysed radical-type reactions"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1090"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of the American Chemical Society"],["dc.bibliographiccitation.lastpage","1096"],["dc.bibliographiccitation.volume","136"],["dc.contributor.author","Paul, Nanda D."],["dc.contributor.author","Mandal, Sutanuva"],["dc.contributor.author","Otte, Matthias"],["dc.contributor.author","Cui, Xin"],["dc.contributor.author","Zhang, X. Peter"],["dc.contributor.author","de Bruin, Bas"],["dc.date.accessioned","2021-04-29T10:11:04Z"],["dc.date.available","2021-04-29T10:11:04Z"],["dc.date.issued","2014-01-22"],["dc.description.abstract","Cobalt(III)-carbene radicals, generated through metalloradical activation of salicyl N-tosylhydrazones by cobalt(II) complexes of porphyrins, readily undergo radical addition to terminal alkynes to produce salicyl-vinyl radical intermediates. Subsequent hydrogen atom transfer (HAT) from the hydroxy group of the salicyl moiety to the vinyl radical leads to the formation of 2H-chromenes. The Co(II)-catalyzed process can tolerate various substitution patterns and produces the corresponding 2H-chromene products in good isolated yields. EPR spectroscopy and radical-trapping experiments with TEMPO are in agreement with the proposed radical mechanism. DFT calculations reveal the formation of the salicyl-vinyl radical intermediate by a metalloradical-mediated process. Unexpectedly, subsequent HAT from the hydroxy moiety to the vinyl radical leads to formation of an o-quinone methide intermediate, which dissociates spontaneously from the cobalt center and easily undergoes an endocyclic, sigmatropic ring-closing reaction to form the final 2H-chromene product."],["dc.identifier.doi","10.1021/ja4111336"],["dc.identifier.pmid","24400781"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84568"],["dc.language.iso","en"],["dc.relation.eissn","1520-5126"],["dc.relation.issn","0002-7863"],["dc.title","Metalloradical approach to 2H-chromenes"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]