3,4-dimethylhexane-2,5-dione

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80-100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80-100° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42,1850-1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301-307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100-120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100-120° C. was collected

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80–100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80–100° C. was collected

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80–100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80–100° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42,1850–1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301–307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100–120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100–120° C. was collected

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30,mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80-100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80-100° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42, 1850-1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301-307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100-120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100-120° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42, 1850-1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301-307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100-120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100-120° C. was collected

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80-100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80-100° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42,1850-1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301-307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100-120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100-120° C. was collected

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

Procedure: A solution of 3,4-dimethylhexane-2,5-dione (3.00 g, 21.1 mmol) and p-toluenesulfonic acid (401 mg, 2.11 mmol) in benzene (30 mL) was heated to reflux in a Dean-Stark trap overnight. The reaction mixture was distilled at atmospheric pressure to remove the excess benzene. The remaining mixture was transferred to a smaller flask and distilled at atmospheric pressure. The fraction that came over between 80-100° C. was collected to give 509 mg (19%) of compound 219A as a light yellow oil. to reflux in a Dean-Stark trap overnight The reaction mixture was distilled at atmospheric pressure to remove the excess benzene The remaining mixture was transferred to a smaller flask distilled at atmospheric pressure came over between 80-100° C. was collected

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

Procedure: Compound 219A was made in accordance with the procedures described in Hancock et al. J. Org. Chem. 42, 1850-1856 (1977) & Amarnath et al. J. Org. Chem., 60, 301-307 (1995). 2-Propanone (100 mL, 1.1 mol) was refluxed over PbO2 (26.7 g, 0.112 mol) for 28 h. After cooling to rt, the reaction mixture was filtered and the residue was washed with acetone. The filtrate was concentrated under reduced pressure to remove the acetone and then distilled at 20 Torr. The fraction that came over between 100-120° C. was collected to give 6.75 g (42.5%) of 3,4-dimethylhexane-2,5-dione as a light yellow oil. the reaction mixture was filtered the residue was washed with acetone The filtrate was concentrated under reduced pressure to remove the acetone distilled at 20 Torr came over between 100-120° C. was collected