Browsing Chemistry by Submit Date
Now showing items 1-20 of 235
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Synthetic studies toward the kempane diterpenes. Construction of a key tricyclic intermediate
(2005)A synthetic sequence is described for construction of the tricyclic portion (35) of kempane diterpenes. The central stereochemistry was established by a Diels-Alder addition of 2,6-dimethyl-para-benzoquinone to a 5-membered, ... -
Vinylogous anionic processes in the formation and interconversion of tetracyclic ring systems
(2011)Tandem oxy-Cope and transannular vinylogous aldol reactions and/or vinylogous retro-aldol, conjugate addition, and transannular vinylogous aldol reactions transformed some tricyclic vinyl enones into fused tetracycles under ... -
Facial selectivity in the 4 + 2 reactions of a diene derived from carvone
(Royal Society of Chemistry, 2006)The facial selectivities of cyclohexadienes bearing isopropenyl and isopropyl groups as plane-nonsymmetric substituents were assessed in 4 + 2 reactions with N-phenylmaleimide, tetracyanoethylene and 4-phenyl-1,2,4- ... -
cis-3,5-Cyclohexadiene-1,2-diol derivatives: facial selectivity in their Diels-Alder reactions with ethylenic, acetylenic and azo dienophiles
(2006)The Diels - Alder reactions of maleimide with the acetonide derivative (6a) of cis-3,5-cyclohexadiene-1,2-diol (1a) in various solvents showed facial selectivities ranging from 1 : 1 to 1 : 9. The same derivative 6a reacted ... -
Chemical Constituents from Stem Bark and Roots of Clausena anisata
(2012-11)Phytochemical investigations on the stem bark and roots of the tropical shrub Clausena anisata led to the isolation and characterization three carbazole alkaloids: girinimbine, murrayamine-A and ekeberginine; two peptide ... -
Implications of finite-size and surface effects on nanosize intercalation materials
(2000-03)A Monte Carlo simulation of a two-dimensional lattice gas with free boundaries is used to study the effects of surface and size on the chemical potential-composition curves of intercalation compounds. In particular we are ... -
Explanation for the 4.8-V plateau LiCrxMn2-xO4
(1998-03)Using the results of photoelectron spectroscopy (PES) measurements on LiCrxMn2-xO4 we provide an explanation for the origin of the 4.8-V plateau in Li/LiCrxMn2-xO4 cells. PES shows that the d bands derived from Mn 3d e(g) ... -
Use of carbon black to eliminate surface charging effects in photoelectron spectroscopy measurements of powders
(1997-10)No abstract available. -
X-ray absorption fine structure and electron energy loss spectroscopy study of silicon nanowires at the Si L-3,L-2 edge
(2001-12)No abstract available. -
Amorphous carbon nanowires investigated by near-edge-x-ray-absorption-fine-structures
(2001-12)No abstract available. -
Soft x-ray-excited luminescence and optical x-ray absorption fine structures of tris (8-hydroxyquinoline) aluminum
(2001-03)No abstract available. -
X-ray spectroscopy studies on the surface structural characteristics and electronic properties of platinum nanoparticles.
(2009)No abstract available. -
Properties and applications of protein-stabilized fluorescent gold nanoclusters: short review.
(2012)A review. Research is turning toward nanotechnol. for solns. to current limitations in biomedical imaging and anal. detection applications. New to fluorescent nanomaterials that could help advance such applications are ... -
X-ray absorption spectroscopy studies of local structure and electronic properties of NaxSi136 (0 < x < 24) clathrates.
(2010)The local structure and electronic properties were probed of Na-contg. type II Si clathrates by x-ray absorption spectroscopy. The near-edge region of the spectrum is particularly sensitive to the local structure surrounding ... -
Surface structural characteristics and tunable electronic properties of wet-chemically prepared Pd nanoparticles.
(2008)No abstract available. -
Nanostructured CdS prepared on porous silicon substrate: Structure, electronic, and optical properties
(2002-05)No abstract available. -
Influence of sample oxidation on the nature of optical luminescence from porous silicon
(2000-07)No abstract available.