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Cationic And Anionic Micellar Catalyzed Hydrolysis Of Hydroxamic Acids, Douglas Eugene Conran
Cationic And Anionic Micellar Catalyzed Hydrolysis Of Hydroxamic Acids, Douglas Eugene Conran
Masters Theses
The hydrolysis of octanohydroxamic and N-methyloctanohydroxamic acids in the presence of cationic and anionic micelles was investigated. Rate constants were determined for the hydrolyses in cetyltrimethylammonium bromide (ctab), the cationic surfactant, with 0.1111 N NaOH and in sodium 1-dodecanesulfonate, the anionic surfactant, with 0.09270 N HC1 at 50.01 + 0.11°C. The acid hydrolysis and the base hydrolysis of N-methyloctanobydroxamic acid followed the standard model for micellar catalysis.
A Microprocessor Controlled Pulsed Hollow Cathode Lamp For An Atomic Absorption Spectrometer, James B. Schilling
A Microprocessor Controlled Pulsed Hollow Cathode Lamp For An Atomic Absorption Spectrometer, James B. Schilling
Masters Theses
A Jarrell-Ash Atomic Absorption/Flame Emission 82-360 Spectrometer was interfaced to a Heathkit ETA-3400 microprocessor. The microprocessor is used to pulse the hollow cathode lamp from a "steady" current to a "peak " current during the opening of the chopper. The current from the photomultiplier-tube is converted to a proportional voltage which is supplied to a sample-and-hold circuit. A successive approximation routine is used to convert the voltage to a representative digital value. Digital values are obtained for the "blank" and "sample" and are used to calculate percent absorption values. The system can also be used to obtain emission values.
The …
Internal Rotation Effects And Nuclear Hyperfine Structure In The Microwave Spectrum Of Propyne-Hf, Roger E. Bumgarner
Internal Rotation Effects And Nuclear Hyperfine Structure In The Microwave Spectrum Of Propyne-Hf, Roger E. Bumgarner
Masters Theses
The microwave spectrum of the weakly bound propyne-HF/DF complex in the region between 6 and 16 GHz was analyzed. The spectrum was characteristic of a distorted T-shaped asymmetric top exhibiting torsional splitting caused by a low barrier to internal rotation of the methyl top relative to the propyne-HF frame. Deuterium substitution of HF confirms that the acid proton of HF is located between the F atom and the propyne triple bond. The spectroscopic constants given below are consistent with the fluorine atom being displaced toward the methyl group from a line perpendicular to and bisecting the propyne triple bond, suggesting …
Synthesis And Reactions Of Aromatic Ethers As Model Compounds For Coal, James Nicolas Ong Sy
Synthesis And Reactions Of Aromatic Ethers As Model Compounds For Coal, James Nicolas Ong Sy
Masters Theses
o-Anisic acid and o-ethoxybenzoic acid were reacted with pyridine hydriodide in pyridine at 115° for 3 days to yield 81% and 18% salicylic acid respectively. o-Anisic acid with KI in pyridine at 115° for 3 days gave 58% salicylic acid while o-anisic acid with LiI·3H2O in pyridine at 85° for 3 days gave 54% salicylic acid. p-Anisic acid and o-phenoxybenzoic acid did not undergo cleavage reactions with pyridine hydriodide under similar conditions.
Beta-methylnaphthyl beta-naphthyl ether(I) or alpha-methylnaphthyl alpha-naphthyl ether(II) with pyridine hydriodide in pyridine at 100-115° for 3 days showed no cleavage. Ether I …
Analysis Of The Surface Polysaccharides Of R. Trifolii Su843 And Its Sym Plasmid Alterated Mutants, Jauh-Lin Duh
Analysis Of The Surface Polysaccharides Of R. Trifolii Su843 And Its Sym Plasmid Alterated Mutants, Jauh-Lin Duh
Masters Theses
The Rhizobium trifolii polysaccharides from SU843 and mutants--HC843(pBR1AN), HC843, 8002--in which the sym plasmid is replaced, absent, or mutated by transposon Tn5 were isolated. The surface polysaccharides of genetically altered mutants were compared quantitatively and qualitatively with one another and with the parent strain. The interpretation of these results is discussed in relation to the function of Rhizobium surface polysaccharides in the symbiotic process. The symbiotic ability of SU843 and mutant strains is as follows: (a) SU843, nod+, fix+; (b) mutant 8002, roa+ (still attaches to root hair), hac-, nod-; (c) …
Preparation And Characterization Of Tertiary Phosphine Carbonyl Ruthenium (0) Complexes, Joann C. Bady
Preparation And Characterization Of Tertiary Phosphine Carbonyl Ruthenium (0) Complexes, Joann C. Bady
Masters Theses
Dichlorocarbonyltris(triphenylphosphine)ruthenium (II), Ru(CO)(Cl)2(Ph3P)3, was prepared by modification of a procedure reported to yield the dimer, (Ru(CO)(Cl)2(Ph3P)2)2. Dissolution of Ru(CO)(Cl)2(Ph3P)3 in acetonitrile resulted in loss of triphenylphosphine and dimer formation.
Metathesis of Ru(CO)(Cl)2(Ph3P)3 in hexane with excess tertiary phosphine yielded complexes of the type Ru(CO)(Cl)2-(R2R′P)3 where R2R′P is Ph2MeP or PhMe2P. 1H and 31p nmr spectra of these materials showed that two phosphines are …
A Study Of The Electroless Plating Of Sn Onto A Die-Cast Aluminum Alloy, Ann-Tinn Shen
A Study Of The Electroless Plating Of Sn Onto A Die-Cast Aluminum Alloy, Ann-Tinn Shen
Masters Theses
"A tin layer was immersion plated onto a zinc-silicon containing aluminum alloy by using a potassium stannate solution. Conventional aluminum pretreatment was used before immersion plating.
Effects of immersion time with immersion tin thickness and Al-Sn adhesion were studied. Conditions of subsequent Sn-Pb electroplating on Sn plated aluminum samples were investigated.
SEM (scanning electron microscope) and x-ray energy dispersion studies were extensively used on samples of each stage"--Abstract, page ii.