Novolak resins: structure elucidation by multidimensional NMR techniques and correlation with lithographic performance

2003 ◽  
Vol 52 (5) ◽  
pp. 757-767 ◽  
Author(s):  
Debmalya Roy ◽  
PK Basu ◽  
P Raghunathan ◽  
SV Eswaran
Keyword(s):  
Structure Elucidation ◽  
Multidimensional Nmr ◽  
Nmr Techniques

Isolation of isoflavonoids from Amphimas pterocarpoides and structure elucidation using LC-HRMSn and NMR techniques

Planta Medica ◽  
2010 ◽  
Vol 76 (12) ◽  
Author(s):  
J Tchoumtchoua ◽  
M Halabalaki ◽  
D Njamen ◽  
J Mbanya ◽  
L Skaltsounis
Keyword(s):  
Structure Elucidation ◽  
Nmr Techniques

ChemInform Abstract: Principles and Applications of Modern 2D NMR Techniques in Structure Elucidation of Complex Natural Products

ChemInform ◽  
2010 ◽  
Vol 23 (42) ◽  
pp. no-no
Author(s):  
ATTA-UR-RAHMAN ATTA-UR-RAHMAN ◽  
M. I. CHOUDHARY ◽  
A. PERVIN
Keyword(s):  
Natural Products ◽  
Structure Elucidation ◽  
2D Nmr ◽  
Nmr Techniques

Facile Synthesis of 4,5-Dihydro-1,3,4-Thiadiazoles by 1,3-Dipolar Cycloaddition of Thioisomünchnones

2009 ◽  
Vol 62 (4) ◽  
pp. 356 ◽  
Author(s):  
Bárbara Sánchez ◽  
José Luis Bravo ◽  
María Josí Arívalo ◽  
Ignacio López ◽  
Mark E. Light ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Structure Elucidation ◽  
Room Temperature ◽  
Dipolar Cycloaddition ◽  
Two Dimensional ◽  
Facile Synthesis ◽  
X Ray ◽  
Mild Conditions ◽  
Nmr Techniques

The present paper summarizes a straightforward synthesis of 4,5-dihydro-1,3,4-thiadiazoles by the 1,3-dipolar cycloaddition of thioisomünchnones. These reactions have been carried out in dichloromethane and are essentially complete within 60 min at room temperature. Under such mild conditions the asymmetric version has been explored as well. Unequivocal structure elucidation has been accomplished by means of one- and two-dimensional NMR techniques as well as X-ray structure analysis.

scholarly journals Minor Triterpene Saponins from Underground Parts of Lysimachia thyrsiflora: Structure elucidation, LC-ESI-MS/MS Quantification, and Biological Activity

2013 ◽  
Vol 8 (12) ◽  
pp. 1934578X1300801 ◽  
Author(s):  
Irma Podolak ◽  
Paweł Żmudzki ◽  
Paulina Koczurkiewicz ◽  
Marta Michalik ◽  
Paweł Zajdel ◽  
...  
Keyword(s):  
Structure Elucidation ◽  
Human Cancer ◽  
Total Content ◽  
Triterpene Saponins ◽  
Human Cancer Cell Lines ◽  
Esi Ms ◽  
Ich Guidelines ◽  
Nmr Techniques ◽  
H 20

Two minor triterpene saponins, one previously not reported, were isolated from the underground parts of Lysimachia thyrsiflora L. The structures were determined based on a combination of one- and two-dimensional NMR techniques, and mass spectrometry, as 30- O-β-D-glucopyranosyl-3β,16α,30-trihydroxy-olean-12-en-28-yl acetate 3- O-β-D-glucopyranosyl-(1→4)- O-[β-D-glucopyranosyl-(1→2)-]- O-α-L-arabinopyranoside (denoted as thyrsiloside A), and davuricoside L. Quantitative determination of these two compounds, along with other saponins present in L. thyrsiflora underground parts, was performed by a developed UPLC-ESI-MS/MS method, validated according to the ICH guidelines. The relative total content of triterpene saponins amounted to 1.19 μg/mg dw. Both 4 and 5 were present in minor quantities, 0.031 and 0.077 μg/mg dw, respectively. Assays performed on a panel of human cancer cell lines showed antiproliferative activity against prostate carcinoma PC-3 (GI50 after 48 h = 20 and 24 μg/mL, respectively).

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