Application of High-Field NMR and Cryogenic Probe Technologies in the Structural Elucidation of Poecillastrin A, a New Antitumor Macrolide Lactam from the SpongePoecillastraSpecies

2002 ◽  
Vol 4 (19) ◽  
pp. 3293-3296 ◽  
Author(s):  
Mohammad A. Rashid ◽  
Kirk R. Gustafson ◽  
Ronald C. Crouch ◽  
Amiram Groweiss ◽  
Lewis K. Pannell ◽  
...  
Keyword(s):  
High Field ◽  
Structural Elucidation ◽  
Cryogenic Probe

scholarly journals Application of High-Field NMR and Cryogenic Probe Technologies in the Structural Elucidation of Poecillastrin A, a New Antitumor Macrolide Lactam from the Sponge Poecillastra Species.

ChemInform ◽  
2003 ◽  
Vol 34 (3) ◽  
Author(s):  
Mohammad A. Rashid ◽  
Kirk R. Gustafson ◽  
Ronald C. Crouch ◽  
Amiram Groweiss ◽  
Lewis K. Pannell ◽  
...  
Keyword(s):  
High Field ◽  
Structural Elucidation ◽  
Cryogenic Probe

Tropical Marine Algae. IV. Novel Metabolites From the Red Alga Laurencia implicata (Rhodophyta, Rhodophyceae, Ceramiales, Rhodomelaceae)

1989 ◽  
Vol 42 (10) ◽  
pp. 1685 ◽  
Author(s):  
JC Coll ◽  
AD Wright
Keyword(s):  
Chlorine Atom ◽  
High Field ◽  
Marine Algae ◽  
Marine Alga ◽  
Red Alga ◽  
Structural Elucidation ◽  
Hydroxy Derivative

The marine alga Laurencia implicata afforded four new C15-lipid' type metabolites: (3Z,6Z,9Z)-12-bromo-5,13-epoxypentadeca-3,6,9-trien-1-yne (6) with an unprecedented 1-oxacyclodecane ring, (3Z,6Z,92)-13-bromo-5,12-epoxypentadeca-3,6,9-trien-1-yne (7) with a nine-membered ether ring, (3E,6S,7S,9S,10S,12S,13R)-10,12-dibromo-6,9:7,13-bisepoxy-pentadec-3-en-l-yne (8), in which a chlorine atom in the known compound chlorofucin (9) has been replaced by bromine, (1R*,4R*,6S*,7S*)-9-acetoxy-1,10,12-tribromo-4,7:6,13-bisepoxypentadeca-1,2-diene (11) and the closely related known metabolite neolaurallene (10). In addition, a brominated sesquiterpene (1'R*,3′R*)-2-(3?-bromo-1′,2′,2′-trimethylcyclopentyl-5-methylphenol (14), The 2′-hydroxy derivative of α- bromocuparene (15), was identified. Structural elucidation of all metabolites was based on high-field n.m.r. studies and comparison with known metabolites.

Structural Elucidation of a Novel Scalarane Derivative by Using High-Field (14.1T) N.M.R. Spectroscopy

1991 ◽  
Vol 44 (7) ◽  
pp. 995 ◽  
Author(s):  
PF Barron ◽  
RJ Quinn ◽  
DJ Tucker
Keyword(s):  
Long Range ◽  
Marine Sponge ◽  
High Field ◽  
Structural Elucidation ◽  
Roesy Spectrum ◽  
Complete Assignment

A novel scalarane derivative (2) has been isolated from the marine sponge Carteriospongia foliascens. A complete assignment of the 1H and 13C n.m.r. spectra of (2) was achieved by using cosy-90, 1H-detected 1H/13C correlation (HMQC sequence) and 1H-detected long-range 1H/13C correlation (HMBC sequence) experiments, all measured at 600 MHz. The assignment of stereochemistry at C4 was supported by a ROESY spectrum.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

High-field magnetoluminescence of ZnSe quantum wires

1998 ◽  
Vol 184-185 (1-2) ◽  
pp. 339-342 ◽  
Author(s):  
L Parthier
Keyword(s):  
High Field ◽  
Quantum Wires

HIGH FIELD N. M. R. IN Cu(NO3)2 2 1/2 H2O BELOW 1°K

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-943-C1-945
Author(s):  
M. W. van TOL ◽  
M. MATSUURA ◽  
N. J. POULIS
Keyword(s):  
High Field

HIGH FIELD MAGNETISM OF THE INTERMETALLIC COMPOUNDS RAg AND RCu (R = Dy, Tb AND Gd)

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-393-C8-394 ◽  
Author(s):  
S. Miura ◽  
T. Kaneko ◽  
S. Abe ◽  
G. Kido ◽  
H. Yoshida ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
High Field

HIGH-FIELD MAGNETIC TRANSITIONS IN THE R2T17 COMPOUNDS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-505-C8-506 ◽  
Author(s):  
J. J. M. Franse ◽  
R. J. Radwaski ◽  
S. Sinnema
Keyword(s):  
High Field ◽  
Magnetic Transitions

Isolation and structural elucidation of novel natural compounds from twigs of Pinus banksiana

Planta Medica ◽  
2013 ◽  
Vol 79 (13) ◽  
Author(s):  
C Si ◽  
X Ren ◽  
S Liu ◽  
G Xu ◽  
J Jiang
Keyword(s):  
Pinus Banksiana ◽  
Natural Compounds ◽  
Structural Elucidation
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