Structural Revision and Elucidation of the Biosynthesis of Hypodoratoxide by13C,13C COSY NMR Spectroscopy

2015 ◽  
Vol 54 (22) ◽  
pp. 6637-6640 ◽  
Author(s):  
Lena Barra ◽  
Kerstin Ibrom ◽  
Jeroen S. Dickschat
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Revision ◽  
Cosy Nmr

Zwölfgliedrige Heteroborancluster durch Copyrolyse von Tetrachlordiboran(4) mit Elementhalogeniden/ Twelve-Vertex Heteroborane Clusters by Copyrolysis of Tetrachlorodiborane(4) and Element Halides

1997 ◽  
Vol 52 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Wolfgang Einholz ◽  
Ronald Schäfer ◽  
Willi Keller ◽  
Bernhard Vogler
Keyword(s):  
Nmr Spectroscopy ◽  
Icosahedral Structure ◽  
Cosy Nmr

Abstract The perchlorinated arsaboranes closo-1,2-As2B10Cl10 and As4B8C16 are formed in the co­ pyrolysis of B2C14 and AsCl3 at temperatures of 330-450°C. The icosahedral structure of closo-1,2-As2B10Cl10 is confirmed by 11B-11B-COSY-NMR spectroscopy. As4B8Cl6 is suppo­ sed to be a conjuncto-borane (As2B4Cl3)2 with two boron-boron linked As2B4Cl3 octahedra. The copyrolysis of B2Cl4 andSbCl3 or SbCl5 yields Sb2B10Cl10, and the corresponding reaction of B2Cl4 with S2Cl2 gives the icosahedral thiaborane cluster SB11Cl11 .

Constitution and HPLC Resolution of Enantiomers of the [8,4'-μ-R2N-commo-(1,2-C2B9H10)2-3-Co] Complexthe Third Isomer of Nitrogen-Bridged Bis

1994 ◽  
Vol 59 (2) ◽  
pp. 374-380 ◽  
Author(s):  
Jaromír Plešek ◽  
Bohumír Grüner ◽  
Stanislav Heřmánek ◽  
Jiří Fusek ◽  
Hana Votavová
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
High Resolution ◽  
Main Product ◽  
High Resolution Mass Spectrometry ◽  
Asymmetric Structure ◽  
Complex Reaction ◽  
Resolution Of Enantiomers ◽  
Cosy Nmr ◽  
Resolution Mass

A fully asymmetric structure of the [4,8'-μ-R2N-commo-(1,2-C2B9H10)2-3-Co] (R = H and Me) cobaltacarborane complexes with a monoatomic nitrogen bridge between both ligands was determined by high resolution mass spectrometry and 1H, 11B NMR, [11B-11B] COSY NMR spectroscopy. Their structures have been also supported by the resolution of both compounds into enantiomers on the β-cyclodextrin HPLC column. A complex reaction of the [3-Co-commo-(1,2-C2B9H11)2]- ion with the NO+ cation is briefly discussed and the tentative structure of the second main product is also suggested.

Synthesis and Properties of Cobaltacarboranes with Substituted Monoatomic Bridges Between Ligands of the 6,6'-μ-RnE(1,7-C2B9H10)2-2-Co Type

1997 ◽  
Vol 62 (6) ◽  
pp. 884-893 ◽  
Author(s):  
Jaromír Plešek ◽  
Bohumír Grüner ◽  
Josef Holub
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Melting Points ◽  
Cosy Nmr

Syntheses, properties and constitutions of eleven asymmetric cobaltacarboranes with various substituents on monoatomic bridges between both ligands of the type 6,6'-μ-RnE(1,7-C2B9H10)2-2-Co (E = O, R = methyl; E = S, R = ethyl, propyl, isopropyl, allyl, butyl, hexyl and CH3OCOCH2; E = N, R = H (H), methyl, (H), and dimethyl) are described. Constitution assignation of all compounds are based on 1H and 11B NMR spectroscopy experiments complemented by 11B-11B COSY NMR and mass spectrometry; UV-VIS, melting points and TLC parameters are also presented. Only the racemic forms were obtained, although in principle, the meso-forms might result as well.

Identification of lactate, threonine and alanine in rat thymus and tumorigenic lymphoid cells using1H 2-D COSY NMR spectroscopy

1992 ◽  
Vol 5 (2) ◽  
pp. 69-74 ◽  
Author(s):  
Hailun L. Tang ◽  
Richard J. Buist ◽  
Raymond H. Rixon ◽  
James F. Whitfield ◽  
Ian C. P. Smith
Keyword(s):  
Nmr Spectroscopy ◽  
Lymphoid Cells ◽  
Cosy Nmr

Automated screening for metabolites in complex mixtures using 2D COSY NMR spectroscopy

Metabolomics ◽  
2006 ◽  
Vol 2 (4) ◽  
pp. 221-233 ◽  
Author(s):  
Yuanxin Xi ◽  
Jeffrey S. de Ropp ◽  
Mark R. Viant ◽  
David L. Woodruff ◽  
Ping Yu
Keyword(s):  
Nmr Spectroscopy ◽  
Complex Mixtures ◽  
Automated Screening ◽  
Cosy Nmr

scholarly journals 2D-Cosy NMR Spectroscopy as a Quantitative Tool in Biological Matrix: Application to Cyclodextrins

2015 ◽  
Vol 17 (6) ◽  
pp. 1501-1510 ◽  
Author(s):  
Gilles Dufour ◽  
Brigitte Evrard ◽  
Pascal de Tullio
Keyword(s):  
Nmr Spectroscopy ◽  
Biological Matrix ◽  
Matrix Application ◽  
Cosy Nmr ◽  
Quantitative Tool

Von organometallisch substituierten Alkenylboranen zu Alienen und 3-Borolenen / From Alkenylboranes Bearing Organometallic Substituents to Alienes and 4-Borolenes

1991 ◽  
Vol 46 (9) ◽  
pp. 1207-1213 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Klaus Horchler von Locquenghien
Keyword(s):  
Nmr Spectroscopy ◽  
Two Dimensional ◽  
Nmr Spectrum ◽  
Multinuclear Nmr ◽  
Multinuclear Nmr Spectroscopy ◽  
Cosy Nmr

Alkenylboranes bearing organometallic substituents (E)—Me3M(R1)C=C(Et)BEt2 [M = Sn, R1 = H (la), Me (lb); M = Pb, R1 = Me (2a), PbMe3 (2b)] react with alkynyllead compounds Me3Pb—C=C—R2 [R2 = Me (3a), 'Bu (3b), PbMe3 (3c)] to give either alienes (5) or 3-borolenes (7), depending on the nature of R2. 3-Borolenes are observed for R2 = Me and diene derivatives were identified in the reaction mixtures as intermediates, consistent with mechanistic suggestions. Only one of the two possible diastereomers of the allene 5b (from la and 3b) is formed. The products have been characterized by multinuclear NMR spectroscopy (1H,11 B,13C, 119Sn and 207Pb NMR). In the case of 5c (from 2b and 3c), a homonuclear two-dimensional 207Pb COSY NMR spectrum serves for the assignment of the 207Pb resonances of diastereomers.

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