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The theory of cosy NMR experiments revisited: Application to an AX spin system of quadrupolar nuclei

The two-dimensional nuclear magnetic resonance correlation spectroscopy (2D NMR COSY) spectrum of an AX spin system of spin-1 has been calculated by numerical density matrix calculations. The mathematical expressions found are valid for an AX spin system of any spins.

出版机构:Wiley Subscription Services, Inc., A Wiley Company

刊物名称:Concepts in Magnetic Resonance Part A

出版时间:2010

ISSN:1546-6086

数据源:报刊文摘

Synthesis and structure elucidation of five new pyrimido[5,4‐c]quinoline‐4(3H)‐one derivatives using 1D and 2D NMR spectroscopy

Five new 2?(amino/aroxy)?5?methylpyrimido[5,4?c]quinolin?4(3H)?one derivatives have been designed and synthesized via an aza?

出版机构:John Wiley & Sons, Ltd.

刊物名称:Magnetic Resonance in Chemistry

出版时间:2010

ISSN:0749-1581

数据源:报刊文摘

Measurement of Three-bond, 13C′-13Cβ J Couplings in Human Ubiquitin by a Triple Resonance, E. COSY-type NMR Technique

A [CO]HN(CA)CB-E.COSY pulse scheme is described for measurement of three-bond couplings, 3JC?C?, between carbonyl and aliphatic C? carbons in ubiquitin, uniformly enriched with 13C and 15N. A Karplus relation, 3JC?C? = 1.28 cos2(? - 120?) -1.02 cos(? - 120?) +0.

出版机构:Springer Netherlands

刊物名称:Journal of Biomolecular NMR

出版时间:1998

ISSN:0925-2738

数据源:报刊文摘

Synthesis and complete assignment of the 1H and 13C NMR signals of new acetamido and aminoflavonoid derivatives

The complete 1H and 13C NMR assignment of 9 acetamidochalcones, 18 acetamidoflavones, 18 aminoflavones, 9 acetamidoflavonols and 9 aminoflavonols has been performed using one- and two-dimensional NMR techniques including COSY, HMQC and HMBC experiments. Copyright ? 2010 John Wiley & Sons, Ltd.

出版机构:John Wiley & Sons, Ltd.

刊物名称:Magnetic Resonance in Chemistry

出版时间:2010

ISSN:0749-1581

数据源:报刊文摘

Triterpene glycosides from Astragalus and their genins. LXXXII. Cyclomacroside B, a new glycoside

The structure of the new cycloartane glycoside cyclomacroside B that was isolated from Astragalus macropus Bunge (Leguminosae) was shown to be 1,7-di-O-acetyl-24R-cycloartan-1

出版机构:Springer US

刊物名称:Chemistry of Natural Compounds

出版时间:2009

ISSN:0009-3130

数据源:报刊文摘

The usefulness of 2D DOSY and 3D DOSY-COSY 1H NMR for mixture analysis: application to genuine and fake formulations of sildenafil (Viagra)

Two-dimensional diffusion ordered spectroscopy (DOSY) 1H NMR is proposed to analyze drugs that are complex mixtures in order to discriminate genuine from fake formulations.

出版机构:John Wiley & Sons, Ltd.

刊物名称:Magnetic Resonance in Chemistry

出版时间:2009

ISSN:0749-1581

数据源:报刊文摘

NMR spectroscopic study of inclusion complexes of cetirizine dihydrochloride and β-cyclodextrin in solution

Cetirizine dihydrochloride (CTZ), an antihistamine, forms two 1:1 inclusion complexes with ?-cyclodextrin (?-CD) in aqueous solution as confirmed by detailed 1H NMR, COSY and ROESY spectroscopic studies.

出版机构:Advanstar Communications, Inc

刊物名称:Spectroscopy

出版时间:2007

ISSN:0712-4813

数据源:报刊文摘

Triterpene glycosides from Astragalus and their genins. LXXXIII. Structure of cyclomacroside A

The structure of the novel cycloartane triterpene glycoside cyclomacroside A, which was isolated from Astragalus macropus Bunge (Leguminosae) roots, was determined as 3-O-?

出版机构:Springer US

刊物名称:Chemistry of Natural Compounds

出版时间:2009

ISSN:0009-3130

数据源:报刊文摘

Toward multipurpose NMR experiments

Standard phase cycled NMR pulse sequences were generalized such that for each individual step of the pulse phase cycle the free induction decay is stored separately without phase correction.

出版机构:John Wiley & Sons, Ltd.

刊物名称:Magnetic Resonance in Chemistry

出版时间:2010

ISSN:0749-1581

数据源:报刊文摘

Triterpene glycosides and their genins from Astragalus. LXXXIV. Secomacrogenin B, a new 9,10-seco-cycloartane

The structure of a new triterpenoid, secomacrogenin B, which was isolated from Astragalus macropus Bunge (Leguminosae) roots and is 24R-9,10-seco-cycloartan-1(10),9(11)-dien-3?,7?,24,25-tetraol, was elucidated.

出版机构:Springer US

刊物名称:Chemistry of Natural Compounds

出版时间:2010

ISSN:0009-3130

数据源:报刊文摘