Now showing items 11-20 of 21
Pyrrolopyrimidine nucleosides 19. A total synthesis of the nucleoside antibiotic cadeguomycin [2-amino-7-([beta]-d-ribofuranosyl)-pyrrolo[2,3-]pyrimidin-4-one-5-carboxylic acid]
(Elsevier, 1983)
A total synthesis of 2-amino-7-([beta]-D-ribofuranosyl)pyrrolo[2,3-]pyrimidin-4-one-5-carboxylic acid has been accomplished and confirms the previous structural assignment for the nucleoside antibiotic cadeguomycin.
A further investigation of the stannic chloride-catalyzed condensation reaction of 1-hexene and 1,2,3,5-tetra-O-acyl-[beta]--ribofuranoses
(Elsevier, 1983-04-16)
The reaction of 1-hexene with either 1-O-acetyl-2,3,5-tri-O-benzoyl-[beta]--ribofuranose (5b) or 1,2,3,5-tetra-O-acetyl-[beta]--ribofuranose (5a) in the presence of stannic chloride leads to the formation of a complex ...
A 1,10-hofmann elimination. Synthesis of a [6.6]paracyclopane tetraene
(Elsevier, 1983)
The synthesis of (, , , ) - [6.6]paracyclophane-1,5,13,17-tetraene the [10+10] cyclodimerization of 7,8-divinyl-p-quinodimethane is described.
Thermophysics of metal alkanoates I. Heat capacities and thermodynamic properties of sodium methanoate and ethanoate
(Elsevier, 1983-05)
The heat capacities of two sodium alkanoates have been studied by adiabatic calorimetry. Earlier measurements from this laboratory on sodium methanoate between 5 and 350 K are supplemented from 300 K to melting. Sodium ...
Surface enhanced raman spectroscopy of halide ions on colloidal silver: simulation of silver-halide ion spectra
(Elsevier, 1983-01-02)
The surface enhanced Raman spectra of halide ions adsorbed on colloidal silver surfaces can be explained by an interacting dipole model of a discrete adsorbate superlattice. Both (100) and (111) surfaces have been modeled, ...
The mechanism of propylene oxidation to acrolein over bismuth molybdate, copper oxide, and rhodium catalysts
(Elsevier, 1983-08)
The oxidation of (E)-propene-1-d1 to acrolein over bismuth molybdate, copper oxide, and rhodium catalysts was studied to determine if the reaction proceeded with (Z)-(E) randomization of the deuterium stereochemistry. Over ...
Vibrational analysis of 2,3-dichlorobutanes
(Elsevier, 1983)
Using intensity changes from liquid to solid for meso- and racemic-2,3-dichlorobutanes, and preliminary normal mode calculations based on a force field for secondary chlorides, we have been able to identify the bands ...
Shift and broadening of the vibrational mode for a diatomic molecule adsorbed on a metal surface
(Elsevier, 1983-06-02)
The shift and broadening of the vibrational frequency of a diatomic molecule adsorbed on a metal surface are calculated on the basis of electromagnetic interactions. Finite molecular size and nonlocal metal response are ...
Synthesis and resolution of substituted pipecolic acids
(Elsevier, 1983)
A new general method for the preparation of 2-alkyl-pipecolic acids has been developed. The syntheses of 2-methyl-, 2-benzyl- and cis-6-methylpipecolic acids are described. (-)S- and (+)R-2-methylpipecolic acids were ...
Alumina-supported triosmium clusters and ensembles: Characterization by high-resolution transmission electron microscopy
(Elsevier, 1983-11)
Structurally defined supported osmium clusters [HOs3(CO)10---O---Al3(CO)12] with the -OH groups of [gamma]-Al2O3. The supported clusters were heated to 200 [deg]C in argon and then reduced in hydrogen at 400 [deg]C, being ...