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Alkylation of a phenol; 2,6-dimethylanisole

SyntheticPage 412
DOI: 10.1039/SP412
Submitted May 27, 2010, published May 27, 2010
David Fox (d.j.fox@warwick.ac.uk)
A contribution from Fox Group, Warwick University


			Reaction Scheme: Alkylation of a phenol

Chemicals Used

2,6-dimethylphenol
sodium hydride (60 % in mineral oil)
methyl iodide

Procedure

Sodium hydride (60% in mineral oil) (44.0 g, 1.10 mol) was washed with petroleum ether (3 × 100mL) and then suspended in dry THF (500 ml) and the mixture was cooled to 0 oC.  2,6-Dimethylphenol (122 g, 1.00 mol) was then added portion-wise and the reaction was stirred for 30 min.  Methyl iodide (213 g, 1.50 mol) was then added and the reaction heated at reflux for 18 h.  The mixture was allowed to cool and the solvent removed in vacuo.  The residue was partitioned between water (500 ml) and CH2Cl2 (3 × 500mL).  The combined organic layers were dried (MgSO4) and reduced in vacuo to give a yellow oil.  This oil was distilled at atmospheric pressure to afford 2,6-dimethylanisole as a colourless oil (97.9 g, 72%).

Author's Comments

Data

bp 182 oC (ref 181-182 oC); δH (200MHz, CDCl3) 7.04 (2H, d, J 6.5, m-CH), 6.94 (1H, t, J 6.5, p-CH), 3.75 (3H, s, OCH3), 2.32 (6H, s, CCH3).

Lead Reference

A. W. Baldwin and R. Robinson, J. Chem. Soc., 1934, 1264-1267.

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Keywords: aromatics/arenes, ethers

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