Search results for "benzen"
showing 10 items of 1735 documents
CCDC 1479590: Experimental Crystal Structure Determination
2016
Related Article: Marwa Chaabéne, Abderrahim Khatyr, Michael Knorr, Moheddine Askri, Yoann Rousselin, Marek M. Kubicki|2016|Inorg.Chim.Acta|451|177|doi:10.1016/j.ica.2016.07.023
De novo biosynthesis of simple aromatic compounds by an arthropod ( Archegozetes longisetosus )
2020
The ability to synthesize simple aromatic compounds is well known from bacteria, fungi and plants, which all share an exclusive biosynthetic route—the shikimic acid pathway. Some of these organisms further evolved the polyketide pathway to form core benzenoids via a head-to-tail condensation of polyketide precursors. Arthropods supposedly lack the ability to synthesize aromatics and instead rely on aromatic amino acids acquired from food, or from symbiotic microorganisms. The few studies purportedly showing de novo biosynthesis via the polyketide synthase (PKS) pathway failed to exclude endosymbiotic bacteria, so their results are inconclusive. We investigated the biosynthesis of aromatic …
Conformational properties of cyanomethoxy calix[4]arenes.
2005
O-Alkylation of the dinitro calix[4]arene 2, easily available by selective ipso-nitration of the di-cyanomethyl ether 1, with allylbromide (DMF/Cs2CO3) gave tetraethers 3 and 4 with anti- and syn-orientations of the two allyl ether residues. The two possible stereoisomers of 3 in the partial cone and 1,2-alternate conformation exist as an equilibrium mixture which could be quantitatively analysed by 1H NMR spectroscopy. The temperature dependence of this equilibrium leads to ΔH0 = − 7.6 to −9.7 kJ mol−1 in different solvents (tetrachloroethane, benzene, dimethylsulfoxide). Since 3(1,2-alt) could be obtained in pure form, its isomerisation to the equilibrium mixture with 3(paco) could be fol…
Bis-macrocyclic Ligands with Two Ferrocenyl End Groups, and Their Tetranuclear Dicopper(I) Compounds
1999
A series of bismacrocyclic ligands with two ferrocenyl groups, exo/endo-1,1‘:1‘ ‘,1‘ ‘‘-[1,2,4,5-tetrakis(5-aza-2-thiahexa-5-enyl)benzene]bisferrocene (exo/endo-FeBeFe), 1,1‘:1‘ ‘,1‘ ‘‘-[1,2:1‘,2‘-tetrakis(5-aza-2-thiahexa-5-enyl)ethene]bisferrocene (1,2-FeEnFe), 1,1‘:1‘ ‘,1‘ ‘‘-[1,1‘:2,2‘-tetrakis(5-aza-2-thiahexa-5-enyl)ethene]bisferrocene (1,1-FeEnFe), 1,1‘:1‘ ‘,1‘ ‘‘-[tetrakis(5-aza-2-thiahexa-5-enyl)methane]bisferrocene (FeMeFe), and their dicopper(I) compounds have been synthesized and characterized (electrochemistry, IR, NMR and Mossbauer spectroscopy). The molecular structure of endo-FeBeFe has been determined by X-ray structure analysis and the copper(I)-induced discrimination of t…
CCDC 681534: Experimental Crystal Structure Determination
2008
Related Article: J.Figueira, J.Rodrigues, L.Russo, K.Rissanen|2008|Acta Crystallogr.,Sect.C:Cryst.Struct.Commun.|64|o33|doi:10.1107/S0108270107065523
CCDC 930279: Experimental Crystal Structure Determination
2013
Related Article: Kaisa Helttunen, Lauri Lehtovaara, Hannu Häkkinen, and Maija Nissinen|2013|Cryst.Growth Des.|13|3603|doi:10.1021/cg4005714
CCDC 1998478: Experimental Crystal Structure Determination
2021
Related Article: Lars J. Wesenberg, Erika Diehl, Till J. B. Zähringer, Carolin Dörr, Dieter Schollmeyer, Akihiro Shimizu, Jun‐ichi Yoshida, Ute A. Hellmich, Siegfried R. Waldvogel|2020|Chem.-Eur.J.|26|17574|doi:10.1002/chem.202003852
CCDC 666841: Experimental Crystal Structure Determination
2008
Related Article: K.Raatikainen, J.Huuskonen, E.Kolehmainen, K.Rissanen|2008|Chem.-Eur.J.|14|3297|doi:10.1002/chem.200701862
CCDC 104281: Experimental Crystal Structure Determination
1997
Related Article: J.Ratilainen, K.Airola, M.Nieger, M.Bohme, J.Huuskonen, K.Rissanen|1997|Chem.-Eur.J.|3|749|doi:10.1002/chem.19970030515
CCDC 1938656: Experimental Crystal Structure Determination
2021
Related Article: Marco Saccone, Meik Blanke, Constantin G. Daniliuc, Heikki Rekola, Jacqueline Stelzer, Arri Priimagi, Jens Voskuhl, Michael Giese|2019|ACS Materials Lett.|1|589|doi:10.1021/acsmaterialslett.9b00371