3-phenyldiazenylpentane-2,4-dione

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

Procedure: To a stirred solution of 50 parts of 3-(phenylazo)-2,4-pentanedione and 35 parts of ethanimidamide monohydrochloride in 711 parts of ethanol was added a solution of 8.5 parts of sodium in 126 parts of ethanol. After stirring overnight at room temperature, the precipitate was filtered off and the filtrate was stirred for 2 days at room temperature. The mixture was evaporated and the residue was diluted with a sodium hydroxide solution 10%. The separated aqueous layer was extracted with methylbenzene. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 7.5 parts (13.8%) of 4,6-dimethyl-5-(phenylazo)-2-pyridinamine as a residue (int. 95). the precipitate was filtered off the filtrate was stirred for 2 days at room temperature The mixture was evaporated the residue was diluted with a sodium hydroxide solution 10% The separated aqueous layer was extracted with methylbenzene The extract was dried filtered evaporated The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent The pure fractions were collected the eluent was evaporated with methylbenzene

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

Procedure: To a stirred solution of 50 parts of 3-(phenylazo)-2,4-pentanedione and 35 parts of ethanimidamide monohydrochloride in 711 parts of ethanol was added a solution of 8.5 parts of sodium in 126 parts of ethanol. After stirring overnight at room temperature, the precipitate was filtered off and the filtrate was stirred for 2 days at room temperature. The mixture was evaporated and the residue was diluted with a sodium hydroxide solution 10%. The separated aqueous layer was extracted with methylbenzene. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 7.5 parts (13.8%) of 4,6-dimethyl-5-(phenylazo)-2-pyridinamine as a residue (int. 95). the precipitate was filtered off the filtrate was stirred for 2 days at room temperature The mixture was evaporated the residue was diluted with a sodium hydroxide solution 10% The separated aqueous layer was extracted with methylbenzene The extract was dried filtered evaporated The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent The pure fractions were collected the eluent was evaporated with methylbenzene

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

Procedure: To a stirred solution of 50 parts of 3-(phenylazo)-2,4-pentanedione and 35 parts of ethanimidamide monohydrochloride in 711 parts of ethanol was added a solution of 8.5 parts of sodium in 126 parts of ethanol. After stirring overnight at room temperature, the precipitate was filtered off and the filtrate was stirred for 2 days at room temperature. The mixture was evaporated and the residue was diluted with a sodium hydroxide solution 10%. The separated aqueous layer was extracted with methylbenzene. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 7.5 parts (13.8%) of 4,6-dimethyl-5-(phenylazo)-2-pyridinamine as a residue (int. 95). the precipitate was filtered off the filtrate was stirred for 2 days at room temperature The mixture was evaporated the residue was diluted with a sodium hydroxide solution 10% The separated aqueous layer was extracted with methylbenzene The extract was dried filtered evaporated The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent The pure fractions were collected the eluent was evaporated with methylbenzene

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

Procedure: To a stirred solution of 50 parts of 3-(phenylazo)-2,4-pentanedione and 35 parts of ethanimidamide monohydrochloride in 711 parts of ethanol was added a solution of 8.5 parts of sodium in 126 parts of ethanol. After stirring overnight at room temperature, the precipitate was filtered off and the filtrate was stirred for 2 days at room temperature. The mixture was evaporated and the residue was diluted with a sodium hydroxide solution 10%. The separated aqueous layer was extracted with methylbenzene. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated with methylbenzene, yielding 7.5 parts (13.8%) of 4,6-dimethyl-5-(phenylazo)-2-pyridinamine as a residue (int. 95). the precipitate was filtered off the filtrate was stirred for 2 days at room temperature The mixture was evaporated the residue was diluted with a sodium hydroxide solution 10% The separated aqueous layer was extracted with methylbenzene The extract was dried filtered evaporated The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent The pure fractions were collected the eluent was evaporated with methylbenzene