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Volumn 41, Issue 25, 2000, Pages 4831-4834

The effect of crown-ether on the palladium-catalyzed Ullmann-type coupling mediated by zinc in air and water

Author keywords

[No Author keywords available]

Indexed keywords

PALLADIUM; ZINC;

EID: 0034686194     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(00)00658-4     Document Type: Article
Times cited : (62)

References (35)
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    • All products are known compounds and were characterized by NMR and GC-MS. Experimental procedure: To a suspension of 4-iodotoluene (300 mg, 1.3 mmol) in 10 mL of de-ionized water in a 50 mL test-tube was added Pd/C (10%, 291 mg, 0.27 mmol), 18-crown-6 (73 mg, 0.27 mmol) and zinc powder (273 mg, 4.12 mmol). The mixture was capped and stirred overnight, diluted with 4 mL 1N aqueous HCl, filtered through Celite and washed with ether. The filtrate was extracted with ether and concentrated. The resulting crude material was passed through a short column of silica gel to give 4,4′-dimethylbiphenyl (85 mg, 68%)
    • All products are known compounds and were characterized by NMR and GC-MS. Experimental procedure: To a suspension of 4-iodotoluene (300 mg, 1.3 mmol) in 10 mL of de-ionized water in a 50 mL test-tube was added Pd/C (10%, 291 mg, 0.27 mmol), 18-crown-6 (73 mg, 0.27 mmol) and zinc powder (273 mg, 4.12 mmol). The mixture was capped and stirred overnight, diluted with 4 mL 1N aqueous HCl, filtered through Celite and washed with ether. The filtrate was extracted with ether and concentrated. The resulting crude material was passed through a short column of silica gel to give 4,4′-dimethylbiphenyl (85 mg, 68%).


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