Search
Now showing items 11-20 of 24
A new method for the in situ generation of chiral and achiral vinylboranes, and their use as reactive dienophiles in Diels-Alder reactions
(1994)
Achiral vinyldihaloboranes, trivinylborane were generated in situ via a newly developed methodology which involves the reaction of vinyltributyltin with BBr$sb3$ or BCl$sb3.$ These compounds proved to be highly activated ...
A study of small volatile organic compounds with PDMS
(1994)
Macfarlane first made the intriguing observation that fission fragment impacts on solid organics can desorb ionized nonvolatile molecules for mass analysis. This technique is called plasma desorption mass spectrometry ...
Sterically encumbered N2S2 complexes of nickel
(1994)
A new ligand based on 1,5-diazacyclooctane (daco) with an increase in steric hinderance has been synthesized. The ligand N,N$spprime$-(bis-2-methyl-$2 $-mercaptopropane)-1,5-diazacyclooctane (bme*-daco) was prepared by the ...
Platinum and Platinum alloy electrocatalysts for oxygen electrodes in Proton Exchange Membrane Fuel Cells : electrochemical and x-ray absorbtion spectroscopic investigation
(1994)
Research on proton exchange membrane fuel cells (PEMFCs) has gained momentum due to the prospects of attaining high energy and power densities, which are essential for transportation and space applications. One of the major ...
Synthesis and characterization of magnesium aluminum phosphates, and related compounds
(1994)
Magnesium aluminophosphate molecular sieves of AlPO$sb4$-5 structure have been synthesized with varying Mg/(Mg + Al + P) mole ratios using triethylamine as an organic template. The synthesized products were characterized ...
A study of secondary ion correlations using coincidence counting time-of-flight mass spectrometry
(1994)
Coincidence counting techniques have been combined with time-of-flight mass spectrometry (TOF-MS) in a study of secondary ion relationships using keV and MeV projectiles. The method is based on analyzing the results of ...
The investigation of the superdegeneracy approach to organic ferromagnets, and the allylboration of alkenes and alkynes using allylic dichloroboranes
(1994)
Several model compounds of potential ferromagnetic organic polymers were synthesized and studied after being reduced with sodium metal. These compounds and target polymers were designed using the principles of the ...
Conformational analysis of 1,3-Dioxole, 1,3-dioxolane, 1,3-dithiolane, and ehtyl nitrite
(1994)
The far-infrared and low-frequency Raman spectra of 1,3-Dioxole have been analyzed. The gas-phase far-infrared spectrum shows a series of eleven singlequantum- jump and three triple-quantum-jump transitions in the 40-330 ...
Iron porphyrin-induced activation of dioxygen via : (A) iron porphyrins and diphenylhydrazine for the hydroxylation of hydrocarbons ; (B) t-Butylhydroperoxide for the direct ketonization of methylenic carbon ; (C) iron porphyrins for the autooxygenation of 3-methylindole
(1994)
The combination of benzyl mercaptan (PhCH$sb2$SH) and (Cl$sb8$TPP)Fe$rmsp{III}$OH or (Cl$sb8$TPP)Fe$rmsp{III}$Cl produces (Cl$sb8$TPP)Fe$rmsp{III}$SCH$sb2$Ph (22). This species and other iron(III) complexes ((Cl$sb8$TPP)Fe$sp{rm ...
Characterization of anodic oxide films
(1994)
Anodic oxide films are used extensively in a variety of applications. This study focuses on characterization of anodic oxide films grown on valve-type metals (Ti, Zr, Nb and Hf) under a variety of experimental conditions. ...