1-methoxy-2-propylbenzene

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

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

Procedure: In a dry 25 mL Schlenk-tube, which has been flooded with argon, 1-methoxy-2-(prop-1-yl)benzene (146 mg, 1 mmol), complex 23a.(Et2O) (22 mg, 0.02 mmol, 2 mol %) and molecular sieve (1 g, 5 Å, powder) were suspended in 5 mL of toluene. The reaction mixture was stirred for 2 h at room temperature, was filtered over a short silica gel column (2 cm), the filtrate was concentrated and the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1). 1,2-bis(2-methoxyphenyl)ethine (115 mg, 0.48 mmol, 97%) was obtained as colorless solid. M.p.=126-127° C.; 1HNMR (400 MHz, CD2Cl2): δ=7.49 (ddd, J=7.3, 1.6, 0.5 Hz, 2H), 7.33 (ddd, J=7.9, 7.7, 1.9 Hz, 2H), 6.95 (td, J=7.9, 1.0 Hz, 4H), 3.92 (s, 6H); 13C NMR (100 MHz, CD2Cl2): δ=160.3 (2×C), 133.7 (2×CH), 130.1 (2×CH), 120.8 (2×CH), 113.0 (2×C), 111.3 (2×CH), 90.1 (2×C), 56.2 (2×CH3); IR (film): v=3105, 3033, 2998, 2963, 2937, 2833, 1945, 1903, 1863, 1598, 1574, 1498, 1464, 1456, 1432, 1274, 1241, 1184, 1162, 1115, 1047, 1020, 937, 750 cm−1; MS (EI) m/z (%): 238 [M+] (100), 237 (32), 223 (23), 221 (15), 207 (10), 195 (5), 178 (8), 165 (14), 152 (9), 131 (19), 111 (6), 97 (3), 89 (3); HRMS (ESI): m/z: calculated for O16H14O2+Na: 261.0886; found: 261.0884. was filtered over a short silica gel column (2 cm) the filtrate was concentrated the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1)

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

Procedure: In a dry 25 mL Schlenk-tube, which has been flooded with argon, 1-methoxy-2-(prop-1-yl)benzene (146 mg, 1 mmol), complex 23a.(Et2O) (22 mg, 0.02 mmol, 2 mol %) and molecular sieve (1 g, 5 Å, powder) were suspended in 5 mL of toluene. The reaction mixture was stirred for 2 h at room temperature, was filtered over a short silica gel column (2 cm), the filtrate was concentrated and the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1). 1,2-bis(2-methoxyphenyl)ethine (115 mg, 0.48 mmol, 97%) was obtained as colorless solid. M.p.=126-127° C.; 1HNMR (400 MHz, CD2Cl2): δ=7.49 (ddd, J=7.3, 1.6, 0.5 Hz, 2H), 7.33 (ddd, J=7.9, 7.7, 1.9 Hz, 2H), 6.95 (td, J=7.9, 1.0 Hz, 4H), 3.92 (s, 6H); 13C NMR (100 MHz, CD2Cl2): δ=160.3 (2×C), 133.7 (2×CH), 130.1 (2×CH), 120.8 (2×CH), 113.0 (2×C), 111.3 (2×CH), 90.1 (2×C), 56.2 (2×CH3); IR (film): v=3105, 3033, 2998, 2963, 2937, 2833, 1945, 1903, 1863, 1598, 1574, 1498, 1464, 1456, 1432, 1274, 1241, 1184, 1162, 1115, 1047, 1020, 937, 750 cm−1; MS (EI) m/z (%): 238 [M+] (100), 237 (32), 223 (23), 221 (15), 207 (10), 195 (5), 178 (8), 165 (14), 152 (9), 131 (19), 111 (6), 97 (3), 89 (3); HRMS (ESI): m/z: calculated for O16H14O2+Na: 261.0886; found: 261.0884. was filtered over a short silica gel column (2 cm) the filtrate was concentrated the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1)

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

Procedure: Aluminium chloride (112 g) was slowly added over one hour to a stirred mixture of o-propylanisole (60 g), glutaric anhydride (50.5 g), tetrachloroethane (880 ml) and nitrobenzene (200 ml) maintained between 3°-4°. The mixture was stirred for two days and then poured into dilute hydrochloric acid. The organic phase was steam distilled, and the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution. Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°) gave 5-oxo-5-(4-methoxy-3-propylphenyl)pentanoic acid (70 g), mp 105°-106°. This acid was refluxed with zinc amalgam (270 g), dioxan (300 ml), toluene (300 ml), and concentrated hydrochloric acid (100 ml) for two days. Extraction with ether and subsequent evaporation gave an oil, which crystallised from cyclohexane to give 5-(4-methoxy-3-propylphenyl)pentanoic acid (36 g), mp 84°. This acid was esterified with methanol and concentrated sulphuric acid, and the methyl ester so obtained (26 g) was added to a stirred suspension of lithium aluminium hydride (3 g) in tetrahydrofuran at 0°. The mixture was refluxed for 3 hours, cooled, treated with water, and extracted with ether, which on evaporation gave the title alcohol (16 g), mp 34.5°-35°. maintained between 3°-4° distilled the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°)

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

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

Procedure: Aluminium chloride (112 g) was slowly added over one hour to a stirred mixture of o-propylanisole (60 g), glutaric anhydride (50.5 g), tetrachloroethane (880 ml) and nitrobenzene (200 ml) maintained between 3°-4°. The mixture was stirred for two days and then poured into dilute hydrochloric acid. The organic phase was steam distilled, and the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution. Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°) gave 5-oxo-5-(4-methoxy-3-propylphenyl)pentanoic acid (70 g), mp 105°-106°. This acid was refluxed with zinc amalgam (270 g), dioxan (300 ml), toluene (300 ml), and concentrated hydrochloric acid (100 ml) for two days. Extraction with ether and subsequent evaporation gave an oil, which crystallised from cyclohexane to give 5-(4-methoxy-3-propylphenyl)pentanoic acid (36 g), mp 84°. This acid was esterified with methanol and concentrated sulphuric acid, and the methyl ester so obtained (26 g) was added to a stirred suspension of lithium aluminium hydride (3 g) in tetrahydrofuran at 0°. The mixture was refluxed for 3 hours, cooled, treated with water, and extracted with ether, which on evaporation gave the title alcohol (16 g), mp 34.5°-35° . maintained between 3°-4° distilled the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°)

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

Procedure: In a dry 25 mL Schlenk-tube, which has been flooded with argon, 1-methoxy-2-(prop-1-yl)benzene (146 mg, 1 mmol), complex 23a.(Et2O) (22 mg, 0.02 mmol, 2 mol %) and molecular sieve (1 g, 5 Å, powder) were suspended in 5 mL of toluene. The reaction mixture was stirred for 2 h at room temperature, was filtered over a short silica gel column (2 cm), the filtrate was concentrated and the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1). 1,2-bis(2-methoxyphenyl)ethine (115 mg, 0.48 mmol, 97%) was obtained as colorless solid. M.p.=126-127° C.; 1HNMR (400 MHz, CD2Cl2): δ=7.49 (ddd, J=7.3, 1.6, 0.5 Hz, 2H), 7.33 (ddd, J=7.9, 7.7, 1.9 Hz, 2H), 6.95 (td, J=7.9, 1.0 Hz, 4H), 3.92 (s, 6H); 13C NMR (100 MHz, CD2Cl2): δ=160.3 (2×C), 133.7 (2×CH), 130.1 (2×CH), 120.8 (2×CH), 113.0 (2×C), 111.3 (2×CH), 90.1 (2×C), 56.2 (2×CH3); IR (film): v=3105, 3033, 2998, 2963, 2937, 2833, 1945, 1903, 1863, 1598, 1574, 1498, 1464, 1456, 1432, 1274, 1241, 1184, 1162, 1115, 1047, 1020, 937, 750 cm−1; MS (EI) m/z (%): 238 [M+] (100), 237 (32), 223 (23), 221 (15), 207 (10), 195 (5), 178 (8), 165 (14), 152 (9), 131 (19), 111 (6), 97 (3), 89 (3); HRMS (ESI): m/z: calculated for O16H14O2+Na: 261.0886; found: 261.0884. was filtered over a short silica gel column (2 cm) the filtrate was concentrated the residue was purified by column chromatography (SiO2, hexane/EtOAc, 20:1)

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

Procedure: Aluminium chloride (112 g) was slowly added over one hour to a stirred mixture of o-propylanisole (60 g), glutaric anhydride (50.5 g), tetrachloroethane (880 ml) and nitrobenzene (200 ml) maintained between 3°-4°. The mixture was stirred for two days and then poured into dilute hydrochloric acid. The organic phase was steam distilled, and the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution. Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°) gave 5-oxo-5-(4-methoxy-3-propylphenyl)pentanoic acid (70 g), mp 105°-106°. This acid was refluxed with zinc amalgam (270 g), dioxan (300 ml), toluene (300 ml), and concentrated hydrochloric acid (100 ml) for two days. Extraction with ether and subsequent evaporation gave an oil, which crystallised from cyclohexane to give 5-(4-methoxy-3-propylphenyl)pentanoic acid (36 g), mp 84°. This acid was esterified with methanol and concentrated sulphuric acid, and the methyl ester so obtained (26 g) was added to a stirred suspension of lithium aluminium hydride (3 g) in tetrahydrofuran at 0°. The mixture was refluxed for 3 hours, cooled, treated with water, and extracted with ether, which on evaporation gave the title alcohol (16 g), mp 34.5°-35°. maintained between 3°-4° distilled the residue remaining was extracted with ether, which was then extracted with sodium bicarbonate solution Acidification and crystallisation from ethylacetate-light petroleum (bp 60°-80°)