Fitjer, Lutz

[["dc.bibliographiccitation.firstpage","4443"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","4449"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Fitjer, L."],["dc.contributor.author","Gerke, R."],["dc.contributor.author","Weiser, J."],["dc.contributor.author","Bunkoczi, G."],["dc.contributor.author","Debreczeni, J. E."],["dc.date.accessioned","2018-11-07T10:38:18Z"],["dc.date.available","2018-11-07T10:38:18Z"],["dc.date.issued","2003"],["dc.description.abstract","The synthesis of (NI)-trispiro[3.0.0.3.2.2]tridecane [(M)-4], the first hydrocarbon with a helical primary structure of four-membered rings, is described. Key step is the kinetic resolution of a cyclobutanone through reduction with bakers' yeast. As compared to its analogue of three-membered rings, (M)-trispiro[2.0.0.2.1.1]nonane [(M)-1], the specific rotation of (M)-4 is cut in three. According to molecular mechanics calculations this could be due to a potential to adopt different conformations, not given in (M)-1, and to the fact, that (M)-4 describes a distinctly shorter section of a helix than (M)-1. (C) 2003 Elsevier Science Ltd. All rights reserved."],["dc.identifier.doi","10.1016/S0040-4020(03)00617-3"],["dc.identifier.isi","000183358200023"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45781"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0040-4020"],["dc.title","Helical primary structures of four-membered rings: (M)-trispiro[3.0.0.3.2.2]tridecane"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4304"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","4312"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Widjaja, Tien"],["dc.contributor.author","Fitjer, Lutz"],["dc.contributor.author","Meindl, Kathrin"],["dc.contributor.author","Herbst-Irmer, Regine"],["dc.date.accessioned","2018-11-07T11:15:10Z"],["dc.date.available","2018-11-07T11:15:10Z"],["dc.date.issued","2008"],["dc.description.abstract","A beta-hydroxy ketone with a helical carbon skeleton of five 1,2-spiroannelated cyclopentane rings is the main product of a Lewis acid catalyzed rearrangement of suitable sized alpha-hydroxy epoxides followed by an in situ equilibration via retro aldol reactions. Various attempts of a conversion to the title hydrocarbon failed. (c) 2008 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.tet.2008.02.073"],["dc.identifier.isi","000255585600019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54307"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0040-4020"],["dc.title","Helical primary structures of 1,2-spiroannelated five-membered rings: attempted synthesis of (+/-)-tetraspiro[4.0.0.0.4.3.3.3]heneicosane"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4510"],["dc.bibliographiccitation.issue","25"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","4514"],["dc.bibliographiccitation.volume","66"],["dc.contributor.author","Dressel, Stefan"],["dc.contributor.author","Schormann, Norbert"],["dc.contributor.author","Fitjer, Lutz"],["dc.date.accessioned","2018-11-07T08:42:12Z"],["dc.date.available","2018-11-07T08:42:12Z"],["dc.date.issued","2010"],["dc.description.abstract","The fragmentation of a suitable methylated 1-oxa-spiro[2.5]octane yields permethyl-cyclohexene. The activation parameters for the chair to chair interconversion of the 1-oxa-spiro[2.5]octane and the half-chair to half-chair interconversion of permethyl-cyclohexene were determined via bandshape analyses of exchange-broadened (1)H and (13)C NMR spectra, respectively. (C) 2010 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.tet.2010.04.068"],["dc.identifier.isi","000278947100015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19648"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0040-4020"],["dc.title","Synthesis, conformation and dynamics of 4,4,5,5,6,6,7,7,8,8-decamethyl-1-oxa-spiro[2.5]octane and 1,2,3,3,4,4,5,5,6,6-decamethyl-cyclohexene"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","9264"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","The Journal of Organic Chemistry"],["dc.bibliographiccitation.lastpage","9277"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Widjaja, Tien"],["dc.contributor.author","Fitjer, Lutz"],["dc.contributor.author","Pal, Aritra"],["dc.contributor.author","Schmidt, Hans-Georg"],["dc.contributor.author","Noltemeyer, Mathias"],["dc.contributor.author","Diedrich, Christian"],["dc.contributor.author","Grimme, Stefan"],["dc.date.accessioned","2018-11-07T10:51:51Z"],["dc.date.available","2018-11-07T10:51:51Z"],["dc.date.issued","2007"],["dc.description.abstract","[Graphics] The pseudohelical hydrocarbons (R)-6, (S)-7, and (R)-8 and the helical hydrocarbon (P)-9, formally derived from the helical hydrocarbon (P)-4 by stepwise replacement of each of the four-membered rings by a five-membered ring, have been prepared. Their optical rotations vary systematically, both in magnitude and sign. Of the extremes, (P)-4 represents the usual case of a right-handed dextrorotatory helix, while (P)-9 represents the unusual case of a right-handed levorotatory helix. To rationalize these facts, DFT calculations of the rotatory power of (P)-helices of three-, four-, and five-membered rings have been performed. The results show a very good agreement with the experimental data for the rigid helices of three-membered rings and always show the correct sign and order of magnitude for the flexible helices of four- and five-membered rings for which Boltzmann-averaged optical rotations of up to six conformers had to be used. Within the conformers of the latter, a set of large dihedral angles for the bonds of the inner sphere correspond to a high specific rotation, and a set of small dihedral angles correspond to a low specific rotation. As a consequence, the Boltzmann-averaged values markedly depend on the geometry and weight of the conformers involved."],["dc.identifier.doi","10.1021/jo7017558"],["dc.identifier.isi","000251039700033"],["dc.identifier.pmid","17973532"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48979"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0022-3263"],["dc.title","Pseudohelical and helical primary structures of 1,2-spiroannelated four- and five-membered rings: Syntheses and chiroptical properties"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","no"],["dc.bibliographiccitation.issue","50"],["dc.bibliographiccitation.journal","ChemInform"],["dc.bibliographiccitation.lastpage","no"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","HUEBNER, M."],["dc.contributor.author","RISSOM, B."],["dc.contributor.author","FITJER, L."],["dc.date.accessioned","2021-12-08T12:28:14Z"],["dc.date.available","2021-12-08T12:28:14Z"],["dc.date.issued","2010"],["dc.identifier.doi","10.1002/chin.199750190"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95613"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation.issn","0931-7597"],["dc.rights.uri","http://doi.wiley.com/10.1002/tdm_license_1.1"],["dc.title","ChemInform Abstract: Conformation and Dynamics of (-)-β-Caryophyllene."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1040"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","1047"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","El-Hachach, Nizar"],["dc.contributor.author","Gerke, Ralf"],["dc.contributor.author","Noltemeyer, Mathias"],["dc.contributor.author","Fitjer, Lutz"],["dc.date.accessioned","2018-11-07T08:33:23Z"],["dc.date.available","2018-11-07T08:33:23Z"],["dc.date.issued","2009"],["dc.description.abstract","New approaches to the protoilludane sesquiterpenes (+/-)-cerapicol and (+/-)-sterpurene via rearrangement routes are described. The absolute configuration of (+)-cerapicol has been determined and found in accord with a biosynthesis of the natural product via cyclization of humulene to the so-called protoilludyl cation and a subsequent 1,2-alkyl shift. (C) 2008 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.tet.2008.11.066"],["dc.identifier.isi","000263218500011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17566"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0040-4020"],["dc.title","Protoilludane sesquiterpenes: synthesis of (+/-)-cerapicol, formal synthesis of (+/-)-sterpurene, and synthesis and absolute configuration of (+)-cerapicol"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","no"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","ChemInform"],["dc.bibliographiccitation.lastpage","no"],["dc.bibliographiccitation.volume","30"],["dc.contributor.author","MANDELT, K."],["dc.contributor.author","FITJER, L."],["dc.date.accessioned","2021-12-08T12:28:27Z"],["dc.date.available","2021-12-08T12:28:27Z"],["dc.date.issued","2010"],["dc.identifier.doi","10.1002/chin.199904180"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95702"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation.eissn","1522-2667"],["dc.relation.issn","0931-7597"],["dc.rights.uri","http://doi.wiley.com/10.1002/tdm_license_1.1"],["dc.title","ChemInform Abstract: Cascade Rearrangements. Part 21. Mono- and Bicyclic Cyclopentenes by Rearrangement of 1-Methylcyclobutylmethanols: Synthesis of (.+-.)-Cuparene and Formal Syntheses of (.+-.)-Laurene and (.+-.)-Herbertene."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1205"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","1213"],["dc.bibliographiccitation.volume","60"],["dc.contributor.author","Fitjer, L."],["dc.contributor.author","Kanschik, A."],["dc.contributor.author","Gerke, R."],["dc.date.accessioned","2018-11-07T10:51:41Z"],["dc.date.available","2018-11-07T10:51:41Z"],["dc.date.issued","2004"],["dc.description.abstract","A new approach to helical primary structures of four-membered rings uses a cycloaddition of a trimethylenketeniminium salt to suitable tailored methylenecyclobutanes to assemble the desired carbon framework. The results are short and effective syntheses of (M)-trispiro[3.0.0.3.2.2]tridecane [(M-5], and (P)- and (M)-tetraspiro[3.0.0.0.3.2.2.2]hexadecane [(P)- and (M)-24]. Unlike helices of three-membered rings, the specific rotation decreases, as the length of the helix increases. (C) 2003 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.tet.2003.11.081"],["dc.identifier.isi","000188536800019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48950"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0040-4020"],["dc.title","A new approach to helical primary structures of four-membered rings: (P)- and (M)-tetraspiro[3.0.0.0.3.2.2.2]hexadecane"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","no"],["dc.bibliographiccitation.issue","39"],["dc.bibliographiccitation.journal","ChemInform"],["dc.bibliographiccitation.lastpage","no"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","RISSOM, B."],["dc.contributor.author","FITJER, L."],["dc.date.accessioned","2021-12-08T12:28:11Z"],["dc.date.available","2021-12-08T12:28:11Z"],["dc.date.issued","2010"],["dc.identifier.doi","10.1002/chin.199739091"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95589"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation.issn","0931-7597"],["dc.rights.uri","http://doi.wiley.com/10.1002/tdm_license_1.1"],["dc.title","ChemInform Abstract: Sterically Crowded Cyclohexanes. Part 10. Synthesis, Conformation and Dynamics of 8,8,13,13-Tetramethyltetraspiro(2.0.3.1.3.1.3.0) heptadecane."],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5192"],["dc.bibliographiccitation.issue","27"],["dc.bibliographiccitation.journal","Tetrahedron"],["dc.bibliographiccitation.lastpage","5198"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","Justus, Karl"],["dc.contributor.author","Beck, Tobias"],["dc.contributor.author","Noltemeyer, Mathias"],["dc.contributor.author","Fitjer, Lutz"],["dc.date.accessioned","2018-11-07T08:27:48Z"],["dc.date.available","2018-11-07T08:27:48Z"],["dc.date.issued","2009"],["dc.description.abstract","The acid catalyzed rearrangement of two cyclohexanols of spiroannelated four-membered rings has been studied. In accordance with molecular mechanics calculations, far-reaching reorganizations with formation of unsaturated hexacyclic systems, including a fully cycloalkylated cyclohexene with a bispropellane Partial structure, were observed. Attempts to convert this bispropellane to a trispropellane failed. (C) 2009 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.tet.2009.05.005"],["dc.identifier.isi","000267587600006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16278"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0040-4020"],["dc.title","Percycloalkylated cyclohexanes: attempted synthesis of a trispropellane"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]