Synthesis of aryloxyacetic acids using tributylethylammonium ethylsulfate as phase transfer catalyst was written by Li, Yiqun. And the article was included in Huaxue Shiji in 2000.SDS of cas: 1877-75-4 This article mentions the following:
Title compounds ArOCH2CO2H (Ar = 4-CH3OC6H4, 4-CH3C6H4, 2-CH3C6H4, 3-CH3C6H4, C6H5, 1-naphthyl, 2-naphthyl, 2-ClC6H4, 2,4-Cl2C6H3) were prepared in CH3CN in the presence of phase transfer catalyst (Bu3(Et)NSO4Et) by reflux. In the experiment, the researchers used many compounds, for example, 2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4SDS of cas: 1877-75-4).
2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. But on the other hand, ethers undergo cleavage by reaction with acids. The unique properties of ethers (i.e., that they are strongly polar, with nonbonding electron pairs but no hydroxyl group) enhance the formation and use of many reagents. For example, Grignard reagents cannot form unless an ether is present to share its lone pair of electrons with the magnesium atom. Complexation of the magnesium atom stabilizes the Grignard reagent and helps to keep it in solution.SDS of cas: 1877-75-4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem