4-chloro-2,5-dimethylphenol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a mechanically-stirred mixture of 71.4 g (0.458 mol) of 4-chloro-2,5-xylenol and 120 mL of nitromethane was added 94 g (0.59 mol) of anhydrous ferric chloride in portions over about 20 minutes with cooling to maintain the temperature below 35° C. The mixture was stirred for an additional 3 hours and then 300 mL of ice water containing 50 mL of concentrated HCl was added, followed by 300 mL of hexanes. The mixture was filtered, and the solids were washed with water and hexanes and dried in vacuo to give 51.0 g of product. The organic phase was separated from the filtrate, washed with water, and concentrated; the residue was then slurried in hexanes and filtered to give another 11 g of product. The total yield was thus 62 g (87%) of a tan solid (mp 148-155° C.). Additional purification to remove traces of iron helps facilitate the subsequent reductive dechlorination. Purification could be accomplished by dissolving in ethyl acetate, washing this solution with aqueous ethylenediamine-tetraacetic acid disodium salt (EDTA-2Na, EDTA=ethylenediaminetetraacetic acid), drying (MgSO4), concentration and washing with hexanes to afford off-white material with mp 164° C. 1H-NMR (CDCl3) δ 1.98 (s, 3H), 2.25 (s, 3H), 4.60 (s, 1H), 7.25 (s, 1H). with cooling to maintain the temperature below 35° C The mixture was filtered the solids were washed with water and hexanes dried in vacuo

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 100 g (0.82 mol) of 2,5-xylenol and 0.9 g of diphenyl sulfide in 700 mL of dichloromethane was added a solution of 106 g (0.79 mol) of sulfuryl chloride in 100 mL of dichloromethane, maintaining the temperature at 5-15° C. The mixture was stirred for an additional hour and then poured onto 400 g of ice-water containing 5 g of sodium bisulfite. The layers were separated, and the organic phase was washed with water, dried (MgSO4), and concentrated to dryness. The crude solids were slurried with a minimum amount of hexanes, filtered, and suction-dried to give 121 g (94%) of product, homogeneous by Thin Layer Chromatography (TLC), GC, and 1H-NMR analysis. 1H-NMR (CDCl3) δ 2.18 (s, 3H), 2.27 (s, 3H), 4.61 (s, 1H), 6.63 (s, 1H), 7.07 (s, 1H). Lit (Blackstock, Aust. J. Chem. 1973, 26, 775): mp 74-75° C. The layers were separated the organic phase was washed with water dried (MgSO4) concentrated to dryness filtered suction-dried

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 100 g (0.82 mol) of 2,5-xylenol and 0.9 g of diphenyl sulfide in 700 mL of dichloromethane was added a solution of 106 g (0.79 mol) of sulfuryl chloride in 100 mL of dichloromethane, maintaining the temperature at 5-15° C. The mixture was stirred for an additional hour and then poured onto 400 g of ice-water containing 5 g of sodium bisulfite. The layers were separated, and the organic phase was washed with water, dried (MgSO4), and concentrated to dryness. The crude solids were slurried with a minimum amount of hexanes, filtered, and suction-dried to give 121 g (94%) of product, homogeneous by Thin Layer Chromatography (TLC), GC, and 1H-NMR analysis. 1H-NMR (CDCl3) δ 2.18 (s, 3H), 2.27 (s, 3H), 4.61 (s, 1H), 6.63 (s, 1H), 7.07 (s, 1H). Lit (Blackstock, Aust. J. Chem. 1973, 26, 775): mp 74-75° C. The layers were separated the organic phase was washed with water dried (MgSO4) concentrated to dryness filtered suction-dried

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 100 g (0.82 mol) of 2,5-xylenol and 0.9 g of diphenyl sulfide in 700 mL of dichloromethane was added a solution of 106 g (0.79 mol) of sulfuryl chloride in 100 mL of dichloromethane, maintaining the temperature at 5-15° C. The mixture was stirred for an additional hour and then poured onto 400 g of ice-water containing 5 g of sodium bisulfite. The layers were separated, and the organic phase was washed with water, dried (MgSO4), and concentrated to dryness. The crude solids were slurried with a minimum amount of hexanes, filtered, and suction-dried to give 121 g (94%) of product, homogeneous by Thin Layer Chromatography (TLC), GC, and 1H-NMR analysis. 1H-NMR (CDCl3) δ 2.18 (s, 3H), 2.27 (s, 3H), 4.61 (s, 1H), 6.63 (s, 1H), 7.07 (s, 1H). Lit (Blackstock, Aust. J. Chem. 1973, 26, 775): mp 74-75° C. The layers were separated the organic phase was washed with water dried (MgSO4) concentrated to dryness filtered suction-dried

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

Procedure: To a mechanically-stirred mixture of 71.4 g (0.458 mol) of 4-chloro-2,5-xylenol and 120 mL of nitromethane was added 94 g (0.59 mol) of anhydrous ferric chloride in portions over about 20 minutes with cooling to maintain the temperature below 35° C. The mixture was stirred for an additional 3 hours and then 300 mL of ice water containing 50 mL of concentrated HCl was added, followed by 300 mL of hexanes. The mixture was filtered, and the solids were washed with water and hexanes and dried in vacuo to give 51.0 g of product. The organic phase was separated from the filtrate, washed with water, and concentrated; the residue was then slurried in hexanes and filtered to give another 11 g of product. The total yield was thus 62 g (87%) of a tan solid (mp 148-155° C.). Additional purification to remove traces of iron helps facilitate the subsequent reductive dechlorination. Purification could be accomplished by dissolving in ethyl acetate, washing this solution with aqueous ethylenediamine-tetraacetic acid disodium salt (EDTA-2Na, EDTA=ethylenediaminetetraacetic acid), drying (MgSO4), concentration and washing with hexanes to afford off-white material with mp 164° C. 1H-NMR (CDCl3) δ 1.98 (s, 3H), 2.25 (s, 3H), 4.60 (s, 1H), 7.25 (s, 1H). with cooling to maintain the temperature below 35° C The mixture was filtered the solids were washed with water and hexanes dried in vacuo