Synthesis and nuclear magnetic resonance spectroscopy of indane structures: indanes mono- and disubstituted in the pentagonal ring

1991 ◽  
Vol 69 (7) ◽  
pp. 1166-1170 ◽  
Author(s):  
Elba N. Alesso ◽  
Dora G. Tombari ◽  
Adriana F. Ibañez ◽  
Graciela Y. Moltrasio Iglesias ◽  
José M. Aguirre
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Key Words ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
C Nmr ◽  
Nuclear Magnetic

Indanes monosubstituted and 1,2- and 1,3-disubstituted in the pentagonal ring were synthesized, and configurations were assigned to the 1,2-disubstituted compounds by means of nuclear magnetic resonance spectroscopy. Key words: mono- and disubstituted indanes, conformation, configuration, 1H and 13C NMR, synthesis.

scholarly journals 13C-nmr Spectroscopy to Monitor Sugars in Pitch of Internodes of a sh2 Corn at Developmental Stages

HortScience ◽  
1998 ◽  
Vol 33 (6) ◽  
pp. 980-983 ◽  
Author(s):  
V.M. Russo ◽  
J. Williamson ◽  
K. Roberts ◽  
J.R. Wright ◽  
N. Maness
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Nmr Spectra ◽  
Developmental Stages ◽  
Sweet Corn ◽  
Resonance Spectroscopy ◽  
C Nmr ◽  
Nuclear Magnetic

Sugars move through stalks to be deposited in kernels in sweet corn (Zea mays L.). Concentrations of sugars in stalks change as plants pass through developmental stages. To follow such changes, carbon-13 nuclear magnetic resonance spectroscopy (C-nmr), a technology that can measure concentrations of sugars in tissues, was compared with analysis by high-performance liquid chromatography (HPLC). A shrunken-2 hybrid (cv. Illini Gold), was monitored from mid-whorl to fresh-market maturity (R3). Internodes near the base of the stalk, just below the ear, and between an ear and the tassel were sampled at each developmental stage. Chemical shifts in C-nmr spectra were measured in parts per million hertz (ppm) down-field relative to tetramethyl silane. Through silk emergence (R1) C-nmr spectra were similar regardless of internode, having line positions between 60 and 105 ppm. Unique lines for glucose, fructose, and sucrose were at 96, 98, and 104 ppm, respectively, and mole fractions were similar to those determined by HPLC. The highest concentrations were recorded at R1 for sucrose (26.1 mg·mL-1), from tasseling (VT) through R3 for fructose (avg. 30.4 mg·mL-1), and from VT to R1 for glucose (avg. 32 mg·mL-1). Carbon-13 nuclear magnetic resonance spectroscopy can be used, with minimal sample handling, to monitor sugar concentrations in sweet corn.

Carbon-13 nuclear magnetic resonance spectroscopy of phorbol

1979 ◽  
Vol 57 (15) ◽  
pp. 2071-2072 ◽  
Author(s):  
M. Neeman ◽  
O. D. Simmons
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Nmr Spectrum ◽  
C Nmr ◽  
Nuclear Magnetic

The 13C nmr spectrum of the diterpene phorbol has been recorded and the signals of all carbons assigned.

13C Nuclear magnetic resonance spectroscopy in the elucidation of structures of diterpenoid alkaloids

1987 ◽  
Vol 65 (1) ◽  
pp. 99-103 ◽  
Author(s):  
Balawant S. Joshi ◽  
John K. Wunderlich ◽  
S. William Pelletier
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Diterpenoid Alkaloids ◽  
Chemical Examination ◽  
13C Nuclear Magnetic Resonance ◽  
C Nmr ◽  
Nuclear Magnetic

13C Nuclear magnetic resonance spectroscopy is an exceptionally useful tool for the structure determination of diterpenoid alkaloids. A detailed study of the 1H and 13C nmr spectra of aconitine and 3-deoxyaconitine has permitted definite assignments to all the carbon atoms of the molecule. Chemical shift revisions have been suggested for certain carbon atoms of the C19-diterpenoid alkaloids. Chemical examination of Aconitumcolumbianum Nutt. ssp. columbianum, A. forrestii Stapf, Delphiniumtatsienense Franch., and D. vestitum Wall, resulted in the isolation of several new C19-diterpenoid alkaloids. The structure derivation of those alkaloids was based mainly on 13C nmr spectroscopic evidence.

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