Physical Sciences and Mathematics Commons^™

Synthesis Of Symmetric And "Mixed-Ligand" Homocyclopentadienyl Ruthenocenes, John Adjeiku Amanfu

Masters Theses

No abstract provided.

Synthesis Of Organometallic Polymers, Po-Chang Chiang

Masters Theses

By the middle of the nineteenth century, organic chemists found high molecular weight compounds as by-products of some of their experiments. These compounds were thought of as products of a failed reaction. It was not until sixty years ago that the first polymers were deliberately synthesized. Today polymers are used in almost every facet of life and they are becoming more important with each passing day.

This research project focused on synthesizing conducting organometallic polymers. By linking aromatic rings with transition metals, the resultant polymers should have good electrical conductivity because of the interaction of (a) the p electrons on …

Single And Double Ionization Of Helium By Highly Charged Sulfur Ions, Karen M. Lifrieri

Masters Theses

Single and double ionization of helium by highly charged sulfur projectiles is investigated over an energy range of 0.16 to 1.6 MeV/u. Absolute cross sections for the processes of pure ionization, ionization associated with single capture, and ionization associated with single loss by S^6,13+ projectiles were experimentally determined and compared with previous results and theories. Ratios of double-tosingle ionization for each outgoing projectile charge state were also determined and compared with theory. The pure ionization ratios for S⁶⁺ at the highest energies investigated show the q²/E dependence predicted by Knudsen et al. (1984). For S^{13+ …}

New Reagents And Reactions For Desulfurization Of Coal, Shan Wang

Masters Theses

Searching for new reagents and reactions for pre-combustion desulfurization of coal was the goal of this work. In this study, modifications of mild desulfurization reactions, which were found to work with organosulfur model compounds, have been investigated systemetically for improvements in sulfur removal and reduction of reagent cost. The screening of reagents and new reactions utilized substituted thiophenes plus aryl sulfides as the initial models for organosulfur compounds in coal. Tetrahydrofuran extracts of Illinois Basin Coals were also used as second generation targets for desulfurization reactions.

Dibenzothiophene was converted to biphenyl using potassium metal/tetrahydrofuran without the addition of electron transfer …

Iron Tricarbonyl Derivatives Of Ditertiary Phosphines, Xi Chen

Masters Theses

In this work we have explored reactions of coordinated diphenylvinylphosphine with coordinated diphenylphosphine. Starting materials, (OC)₄FePPh₂CH=CH₂, trans- (OC)₃Fe(PPh₂CH=CH₂)₂, (OC)₄FePPh₂H, and trans- (OC)₃Fe(PPh₂H)₂ were successfully prepared from known procedures. The bimetallic complex, (OC)₄FePPh₂CH₂CH₂PPh₂Fe(CO)₄, was obtained in 69% yield from the reaction of ((OC)₄FePPh₂CH=CH₂ with (OC)₄FePPh₂H. The trimetallic complex, (OC)₄FePPh₂CH₂CH_{2 …}

Studies On Improving The Regioselectivity Of Reactions Of Sucrose: The Role Of Molecular Recognition And Polymer Supported Syntheses, Ran Jiang

Masters Theses

The world economy is critically dependent upon natural resources. Because sucrose can be inexpensively produced in large quantities and refined to a purity unequalled by almost all other natural products, it has been exploited as an industrial raw material for many years, primarily as a sweetener. A major difficulty in utilizing sucrose as an industrial feedstock is the lack of regioselectivity in synthetic reactions due to its eight hydroxyl groups of similar reactivity.

The long range goal in this work is to apply the technique of molecular recognition by template imprinting to the creation of a material that will bind …

Butenolide Synthesis Via Cation-Initiated Ring Expansion/Elimination Of Β-Lactones, Jianhua Huang

Masters Theses

An area of recent research in the Black research group is an exploration of the potential of cation-initiated β-lactone ring expansions, accompanied by the elimination of a proton or other electrofuge, as a protocol for the synthesis of multisubstituted butenolides.

Γ-Bromo β-lactones were prepared via bromolactonization of the appropriate β,Γ-unsaturated acids under basic conditions. The nucleofugal bromine atom on the Γ-carbon was then employed to effect carbocation formation adjacent to the lactone ring oxygen atom; the most efficacious reagent combination was found to be silver nitrate in refluxing acetic acid. Generation of this cation initiated a migration of the β-lactone …