13334-71-9Relevant articles and documents
Preparation method of 5-halo-2-alkyloxy-4-toluene sulfochloride
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Paragraph 0021; 0027; 0033; 0051; 0055-0057; 0063, (2017/08/29)
The invention relates to the technical field of chemical material intermediate synthesis, in particular to a preparation method of 5-halo-2-alkyloxy-4-toluene sulfochloride. The 5-halo-2-alkyloxy-4-toluene sulfochloride is formed by taking cheap and avail
Selective O-methylation of phenols and benzyl alcohols in simple pyridinium based ionic liquids
Das, Pranab Jyoti,Das, Jupitara
, p. 94 - 98 (2015/06/08)
Synthesis of pyridinium based ionic liquids were reported and applied as catalyst for the selective O-methylation of phenols and benzyl alcohols. The reactions were carried out by using dimethylcarbonate (DMC) as the methylating agent. High selectivity, high yield and recyclability of the ionic liquids are important features of the reactions.
A continuous methylation of phenols and N, H -heteroaromatic compounds with dimethyl carbonate
Tilstam, Ulf
, p. 1974 - 1978 (2013/02/25)
The methylation of phenolic substrates has been reevaluated using sulfolane as solvent instead of DMF. The change of solvent gave in all cases cleaner production of the anisole products in very good yields. The reaction requires 0.1 equiv of DBU, 2-3 equiv of DMC, and 2-5 vols of sulfolane depending on the substrate. At 220 C the reaction time is 10 min. Sulfolane is completely stable under the reaction conditions, excluding unwanted impurities from the solvent. The reaction could also be extended to NH-indole and NH-imidazole derivatives utilizing 0.1 equiv of DBU and 2-3 equiv of DMC in 2 vols of sulfolane. All NH-heteroaromatic compounds gave clean N-methylation.