ChemInform Abstract: DETERMINATION OF THE CONFORMATION OF SUBSTITUTED 4,6-DIOXO-1,3-DIOXANES. PART II. PROTON NMR SPECTRA OF SOME 2-PHENYL-4,6-DIOXO-1,3-DIOXANES. THE CONFORMATIONAL PREFERENCE OF THE PHENYL GROUP

1976 ◽  
Vol 7 (51) ◽  
pp. no-no
Author(s):  
P. AEYRAES ◽  
S. LOETJOENEN
Keyword(s):  
Nmr Spectra ◽  
Proton Nmr ◽  
Phenyl Group ◽  
Conformational Preference

1H, 13C, and 15N NMR Spectra of Ni(II) Complexes of Schiff Bases of (S)-2-(N-Benzylprolyl)aminobenzophenone and α-Monosubstituted Glycine and Determination of Configuration of the Complexes by 2D NOESY Spectra

1995 ◽  
Vol 60 (6) ◽  
pp. 990-998 ◽  
Author(s):  
Josef Jirman ◽  
Alexander Popkov
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Absolute Configuration ◽  
Nmr Spectra ◽  
Phenyl Group ◽  
15N Nmr ◽  
Dimethylamino Group ◽  
2D Noesy ◽  
Noesy Spectra

1H, 13C, and 15N NMR spectra have been measured of substituted Ni(II) complexes of Schiff bases of (S)-2-(N-benzylprolyl)aminobenzophenone and glycine. The absolute configuration at C19 of the substituted glycine can be determined from 2D NOESY spectra using the NOESY interactions with the proton of the second chiral centre of the complex. It is possible to determine the rate of rotation of phenyl group of benzophenone unless its rotation is prevented by requatorialr orientation of dimethylamino group as it is the case with the Ni(II) complex of Schiff base of (S)-2-(N-benzylprolyl)aminobenzophenone and (S)-α-dimethylaminoglycine.

1H and 13C NMR spectra of 2,2’-disubstitutedtrans-azobenzenes suitable for preparation of metallized azo dyes

1991 ◽  
Vol 56 (10) ◽  
pp. 2160-2168 ◽  
Author(s):  
Josef Jirman
Keyword(s):  
Nmr Spectra ◽  
Electron Pair ◽  
Phenyl Group ◽  
Aprotic Solvents ◽  
1H And 13C Nmr ◽  
Predominant Form ◽  
Rapid Equilibrium ◽  
Dipolar Aprotic Solvents ◽  
Free Electron Pair ◽  
C Nmr

The 1H and 13C NMR spectra have been measured of six trans-azobenzenes substituted at 2 and 2’ positions with substituents favourable for complex formation with a metal (OH, NH2, NHCOCH3, COOH). From the standpoint of NMR such substituted trans-azobenzenes are present in solution in a rapid equilibrium following from rotation around the bond between C-1 of phenyl group and N atom of azo linkage. The predominant form has the substituent in the syn-position with respect to the free electron pair of the nearer azo nitrogen atom. The equilibrium is affected by dipolar aprotic solvents (such as hexadeuteriodimethyl sulfoxide) by decreasing the presence of the predominant form by 1 to 11%.

NMR Determination of the Structure of Peracetylated Icariside B2 from Veratrum Lobelianum BERNH.

1995 ◽  
Vol 60 (8) ◽  
pp. 1380-1385 ◽  
Author(s):  
Václav Suchý ◽  
Miloš Buděšínský ◽  
Karel Ubik ◽  
Daniel Grančai ◽  
Vlasta Földešiová
Keyword(s):  
Detailed Analysis ◽  
Nmr Spectra ◽  
Aerial Part ◽  
C Nmr

rel(1S,4S,5R)-3,3,5-Trimethyl-4-[( 1E)-3-oxo-1-butenyl]-4,5-epoxy-cyclohexyl-O-β-D-glucopyranoside (I) was isolated from the aerial part of Veratrum lobelianum BERNH. The structure was derived mainly from detailed analysis of 1H and 13C NMR spectra of its acetylated derivative II. Compound I has been already reported under the name icariside B2in Epimedium grandiflorum MORR. var. thunbergianum (MIQ.) NAKAI.

Sequential injection analysis coupled to on-line benchtop proton NMR: Method development and application to the determination of synthetic cathinones in seized drug samples

Talanta ◽  
2021 ◽  
Vol 231 ◽  
pp. 122355
Author(s):  
Timothy J. Trinklein ◽  
Malati Thapa ◽  
Lexie A. Lanphere ◽  
John A. Frost ◽  
Sandra M. Koresch ◽  
...  
Keyword(s):  
Method Development ◽  
Proton Nmr ◽  
Synthetic Cathinones ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Nmr Method ◽  
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