Physical Sciences and Mathematics Commons^™

Controlling The Number Of Metal Sites To Which A Polytertiary Phosphine Coordinates In Tungsten Carbonyls, Rodney D. Borger

Masters Theses

Judiciously selected coordinated fragments of Ph₂PCH₂CH₂PPhCH₂-CH₂PPh₂ [(OC)₅WPPh₂H, (OC)₅WPPh₂CH=CH₂ and (OC)₅WPPh(CH=CH₂)₂] were used to construct its five possible nonchelated pentacarbonyltungsten complexes. These are the trimetallic (OC)₅WPPh[CH₂CH₂PPh₂W(CO)₅]₂ and the two pairs of constitutional isomers, (OC)₅WPPh[CH₂CH₂PPh₂]₂ and (OC)₅WPPh₂CH₂CH₂PPhCH₂CH₂PPh₂, and PPh[CH₂CH_{2 …}

Analysis Of Coal Fractions Using Dibromotriphenyl-Phosphorane: A Selective Ether Cleaving Reagent, Michael L. Ballard

Masters Theses

Dibromotriphenylphosphorane (DTP), in acetonitrile at 40°C, was found to cleave benzyl phenyl ether in preference to di-alkyl or other aryl alkyl ethers. Competition between 10 mmoles benzyl phenyl ether and 10 mmoles di-n-octyl ether for 0.92 mmole of DTP gave 48% cleavage of benzyl phenyl ether and 1.3% cleavage of di-n-octyl ether based on DTP. Reaction of benzyl phenyl ether and di-n-octyl ether separately with DTP at 40°C produced 80% and 8% cleavage, respectively. Reactions of DTP with diphenyl ether, butyl phenyl ether, phenyl cyclohexyl ether and benzyl benzoate at 40°C produced less than 3% cleavage in all cases.

Reaction …

Spectroscopic Studies Of Pre-Mixed Hydrocarbon Flame Plasmas, Tsao-Chin C. Huang

Masters Theses

This thesis contains two different studies.

Chapter 1, "Infrared Emission Spectrum of the Hydroxyl Radical.", is in collaboration with Dr. Giles L. Henderson and Mr. Chun-Sheng Ko. This chapter has been submitted and accepted for publication by the Journal of Chemical Education.

In this chapter, we describe a rather novel physical chemistry experiment in which ab initio potential parameters for the OH radical are compared with those obtained from the ir emission spectrum of an oxy-acetylene welding torch.

Chapter 2, "A Preliminary Spectroscopic Study of Field-Induced Ion Movements in Flame Gases.", describes the effects of longitudinal electric fields on CH …

Cis Labilization: A Study Of The Reactions Of Group 6 Pentacarbonyl Phosphido Anions, Matthew J. Madigan

Masters Theses

The synthesis of cis-(OC)₄M(PPh₂H)L (M=Cr,Mo,W; L=PPh₃,PPh₂Et,PPhEt₂,PEt₃) can be achieved by treating (OC)₅MPPh₂H with potassium tert-butoxide in the presence of L. […] The products are easily isolated and are not contaminated with trans isomers. Obtained as a minor product is [(OC)₄MPPh₂]₂.

The reaction of (OC)₅WPPh₂H with potassium tert-butoxide generates [(OC)₅WPPh₂]^- which reacts with (OC)₅WPPh₂H to give [(OC)₅WPPh₂W(CO)₅] …

Pyridine Hydrogen Iodide As An Ether Cleaving Agent In Coal Chemistry, Agnes Mei-Ying Chen

Masters Theses

Reactions of several phenyl ethers and an ester with pyridine hydrogen iodide were examined under various conditions as model studies for the recently reported molecular weight reduction of a fraction of Illinois No. 6 coal by hydrogen iodide in pyridine at 50°.

No ether or ester cleavage was observed at 60-80° in pyridine, acetonitrile, ethanol or the absence of solvent. Sealed tube reactions at 210° resulted in cleavage to phenol plus various hydrocarbon and alkyl halide products. Pyridine and benzyl phenyl ether at 210° produced no cleavage in the absence of hydrogen iodide.

Syntheses of crystalline pyridine hydrogen iodide and …