tellurium dioxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (79.5 g=0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml). Hydroxylamine hydrochloride (35 g=0.5 mole) was added and then ethanol to bring the total volume to 2000 ml. To the slightly turbid solution was added 4-methyl-α-tetralone (80 g=0.5 mole) and the stirred mixture heated briefly to boil. The clear deep red solution was then kept overnight at room temperature. The solid mass of crystalline product was collected, washed well with water and dried in a vacuum oven at 90° C. to give a first crop (111.1 g) of dark red needles. The filtrate was heated once again and kept at room temperature for 24 hours. A second crop of 14.3 g crude product was obtained. The well-dried product was placed into a Soxhlet thimble and extracted with methylene chloride. The majority of purified product crystallized from the solvent during the course of the extraction to give a yield of 97.0 g=58.3% of theory, m.p. 196°-198° C. Elemental analyses results were in agreement with the structural formula. The ultraviolet and visible spectra in dichloromethane showed three maxima. the stirred mixture heated briefly The solid mass of crystalline product was collected washed well with water dried in a vacuum oven at 90° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (79.5 g=0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml). Hydroxylamine hydrochloride (35 g=0.5 mole) was added and then ethanol to bring the total volume to 2000 ml. To the slightly turbid solution was added 4-methyl-α-tetralone (80 g=0.5 mole) and the stirred mixture heated briefly to boil. The clear deep red solution was then kept overnight at room temperature. The solid mass of crystalline product was collected, washed well with water and dried in a vacuum oven at 90° C. to give a first crop (111.1 g) of dark red needles. The filtrate was heated once again and kept at room temperature for 24 hours. A second crop of 14.3 g crude product was obtained. The well-dried product was placed into a Soxhlet thimble and extracted with methylene chloride. The majority of purified product crystallized from the solvent during the course of the extraction to give a yield of 97.0 g=58.3% of theory, m.p. 196°-198° C. Elemental analyses results were in agreement with the structural formula. The ultraviolet and visible spectra in dichloromethane showed three maxima. the stirred mixture heated briefly The solid mass of crystalline product was collected washed well with water dried in a vacuum oven at 90° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (80 g, 0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml, 2.0 moles) with stirring. When solution was complete, a suspension of hydroxylamine hydrochloride (69 g, 1.0 mole) in ethyl alcohol (300 ml) was added. When all solid was dissolved, α-tetralone (73 g, 0.5 mole) in ethyl alcohol (1200 ml) was added. The clear reaction mixture rapidly turned red and dark crystals began to form within an hour. After the reaction mixture had been kept five days at room temperature, the product was isolated by room temperature, the product was isolated by filtration and dried in a vacuum. Yield 123.2 g. was added When all solid was dissolved to form within an hour the product was isolated by room temperature the product was isolated by filtration dried in a vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (80 g, 0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml, 2.0 moles) with stirring. When solution was complete, a suspension of hydroxylamine hydrochloride (69 g, 1.0 mole) in ethyl alcohol (300 ml) was added. When all solid was dissolved, α-tetralone (73 g, 0.5 mole) in ethyl alcohol (1200 ml) was added. The clear reaction mixture rapidly turned red and dark crystals began to form within an hour. After the reaction mixture had been kept five days at room temperature, the product was isolated by room temperature, the product was isolated by filtration and dried in a vacuum. Yield 123.2 g. was added When all solid was dissolved to form within an hour the product was isolated by room temperature the product was isolated by filtration dried in a vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (79.5 g=0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml). Hydroxylamine hydrochloride (35 g=0.5 mole) was added and then ethanol to bring the total volume to 2000 ml. To the slightly turbid solution was added 4-methyl-α-tetralone (80 g=0.5 mole) and the stirred mixture heated briefly to boil. The clear deep red solution was then kept overnight at room temperature. The solid mass of crystalline product was collected, washed well with water and dried in a vacuum oven at 90° C. to give a first crop (111.1 g) of dark red needles. The filtrate was heated once again and kept at room temperature for 24 hours. A second crop of 14.3 g crude product was obtained. The well-dried product was placed into a Soxhlet thimble and extracted with methylene chloride. The majority of purified product crystallized from the solvent during the course of the extraction to give a yield of 97.0 g=58.3% of theory, m.p. 196°-198° C. Elemental analyses results were in agreement with the structural formula. The ultraviolet and visible spectra in dichloromethane showed three maxima. the stirred mixture heated briefly The solid mass of crystalline product was collected washed well with water dried in a vacuum oven at 90° C.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tellurium dioxide (80 g, 0.5 mole) was dissolved in concentrated hydrochloric acid (200 ml, 2.0 moles) with stirring. When solution was complete, a suspension of hydroxylamine hydrochloride (69 g, 1.0 mole) in ethyl alcohol (300 ml) was added. When all solid was dissolved, α-tetralone (73 g, 0.5 mole) in ethyl alcohol (1200 ml) was added. The clear reaction mixture rapidly turned red and dark crystals began to form within an hour. After the reaction mixture had been kept five days at room temperature, the product was isolated by room temperature, the product was isolated by filtration and dried in a vacuum. Yield 123.2 g. was added When all solid was dissolved to form within an hour the product was isolated by room temperature the product was isolated by filtration dried in a vacuum