Toxicological & Environmental Chemistry, Dec 1, 1992
... LAURA L. KINNER and AUDREY E. McGOWIN ChemChar Research, Inc., T-16 Research Park, Columbia, ... more ... LAURA L. KINNER and AUDREY E. McGOWIN ChemChar Research, Inc., T-16 Research Park, Columbia, Missouri 65211, USA ... Heating the carbon at the bottom (downstream) end of the carbon plug initiates a gasification flame front. ...
The fate of mercury in the treatment of hazardous waste by reverse-burn gasification was investig... more The fate of mercury in the treatment of hazardous waste by reverse-burn gasification was investigated. Mercuric chloride was loaded into coal char at a rate of 333 μg/g and the char was subjected to reverse-burn gasification to determine if mercury would be vaporized in the process as it is in typical incineration processes. Two types of mercury vapor traps, Amberlite
The selectivity of the 1,3-dipolar cycloaddition reaction of methyl propiolate to 3-phenylsydnone... more The selectivity of the 1,3-dipolar cycloaddition reaction of methyl propiolate to 3-phenylsydnone was measured under various conditions of pressure (7.6–30.4 MPa) and temperature (333–423 K) in near- or supercritical carbon dioxide. The reaction produces a mixture of two regioisomers, 3-carbomethoxy-1-phenylpyrazole (isomer A) and 4-carbomethoxy-1-phenylpyrazole (isomer B). Reaction composition was measured by high-performance liquid chromatography (HPLC). A supercritical fluid extraction (SFE) instrument, programmed in the static mode, was used as the reaction apparatus. The selectivity (isomer A/isomer B) of the reaction was compared with the selectivity in toluene at 353 K. For both solvents, selectivity did not vary over time for up to 12 h in CO2 and 67 h in toluene. The mean selectivity measured in toluene was 3.62 compared with 5.08 in CO2. At 7.6 MPa and 1 h in CO2, the selectivity decreased with increasing temperature from 5.52 at 353 K to 3.14 at 423 K. At 353 K and 3 h, the selectivity increased with increasing pressure from 4.96 at 7.6 MPa to 6.56 at 30.4 MPa, however, the yield decreased by 50%. Overall, lower pressure and higher temperature gave higher yields while higher pressure and lower temperature produced greater selectivity of isomer A over isomer B.
Abstract Concentrations of iron, lead, arsenic, manganese, zinc, and cadmium in the water and sed... more Abstract Concentrations of iron, lead, arsenic, manganese, zinc, and cadmium in the water and sediment of the Yellow Spring, an artesian spring in a Southwest Ohio nature preserve, were measured. D...
Organic preparations and procedures international, Feb 1, 2001
10. The data for product obtained by DDQ oxidation of phenolphthalein hydroxyamide are: ESMS (M +... more 10. The data for product obtained by DDQ oxidation of phenolphthalein hydroxyamide are: ESMS (M + H)+ at 334.2; 'H NMR: 6 11.2 (s, lH), 9.62 (br, 2H), 7.88 (dd, lH, J = 7.3, J = 1.8 Hz), 7.51 (m, 3H), 6.83 (d, 4H, J = 8.6 Hz), 6.72 (d, 4H, J = 8.8 Hz), 6.65 (d, 1H J = 7.1 Hz); I3C NMR: 6 162.8, 157.3, 143.4, 132.1, 131.4, 129.8, 128.0, 127.0, 126.4, 126.1, 114.6,88.1. Althoughthe mass spectrum may be consistent for either the five-membered hydroxyspirolactam or a sixmembered oxolactam, the "C NMR differs from other spirolactams (N-C9 at -74.0 ppm), in that it shows a C9 resonance at 88.1 ppm, indicative of a C9 substituted with oxygen. In contrast, the N-0x0 and Namino fluorescein spirolactams (reference 6 above) display resonances similar to other N-alkyl species (all show C9 -64 ppm).
Toxicological & Environmental Chemistry, Dec 1, 1992
... LAURA L. KINNER and AUDREY E. McGOWIN ChemChar Research, Inc., T-16 Research Park, Columbia, ... more ... LAURA L. KINNER and AUDREY E. McGOWIN ChemChar Research, Inc., T-16 Research Park, Columbia, Missouri 65211, USA ... Heating the carbon at the bottom (downstream) end of the carbon plug initiates a gasification flame front. ...
The fate of mercury in the treatment of hazardous waste by reverse-burn gasification was investig... more The fate of mercury in the treatment of hazardous waste by reverse-burn gasification was investigated. Mercuric chloride was loaded into coal char at a rate of 333 μg/g and the char was subjected to reverse-burn gasification to determine if mercury would be vaporized in the process as it is in typical incineration processes. Two types of mercury vapor traps, Amberlite
The selectivity of the 1,3-dipolar cycloaddition reaction of methyl propiolate to 3-phenylsydnone... more The selectivity of the 1,3-dipolar cycloaddition reaction of methyl propiolate to 3-phenylsydnone was measured under various conditions of pressure (7.6–30.4 MPa) and temperature (333–423 K) in near- or supercritical carbon dioxide. The reaction produces a mixture of two regioisomers, 3-carbomethoxy-1-phenylpyrazole (isomer A) and 4-carbomethoxy-1-phenylpyrazole (isomer B). Reaction composition was measured by high-performance liquid chromatography (HPLC). A supercritical fluid extraction (SFE) instrument, programmed in the static mode, was used as the reaction apparatus. The selectivity (isomer A/isomer B) of the reaction was compared with the selectivity in toluene at 353 K. For both solvents, selectivity did not vary over time for up to 12 h in CO2 and 67 h in toluene. The mean selectivity measured in toluene was 3.62 compared with 5.08 in CO2. At 7.6 MPa and 1 h in CO2, the selectivity decreased with increasing temperature from 5.52 at 353 K to 3.14 at 423 K. At 353 K and 3 h, the selectivity increased with increasing pressure from 4.96 at 7.6 MPa to 6.56 at 30.4 MPa, however, the yield decreased by 50%. Overall, lower pressure and higher temperature gave higher yields while higher pressure and lower temperature produced greater selectivity of isomer A over isomer B.
Abstract Concentrations of iron, lead, arsenic, manganese, zinc, and cadmium in the water and sed... more Abstract Concentrations of iron, lead, arsenic, manganese, zinc, and cadmium in the water and sediment of the Yellow Spring, an artesian spring in a Southwest Ohio nature preserve, were measured. D...
Organic preparations and procedures international, Feb 1, 2001
10. The data for product obtained by DDQ oxidation of phenolphthalein hydroxyamide are: ESMS (M +... more 10. The data for product obtained by DDQ oxidation of phenolphthalein hydroxyamide are: ESMS (M + H)+ at 334.2; 'H NMR: 6 11.2 (s, lH), 9.62 (br, 2H), 7.88 (dd, lH, J = 7.3, J = 1.8 Hz), 7.51 (m, 3H), 6.83 (d, 4H, J = 8.6 Hz), 6.72 (d, 4H, J = 8.8 Hz), 6.65 (d, 1H J = 7.1 Hz); I3C NMR: 6 162.8, 157.3, 143.4, 132.1, 131.4, 129.8, 128.0, 127.0, 126.4, 126.1, 114.6,88.1. Althoughthe mass spectrum may be consistent for either the five-membered hydroxyspirolactam or a sixmembered oxolactam, the "C NMR differs from other spirolactams (N-C9 at -74.0 ppm), in that it shows a C9 resonance at 88.1 ppm, indicative of a C9 substituted with oxygen. In contrast, the N-0x0 and Namino fluorescein spirolactams (reference 6 above) display resonances similar to other N-alkyl species (all show C9 -64 ppm).
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