Kaur, Jaspal et al. published their research in Chemical Communications (Cambridge, United Kingdom) in 2002 | CAS: 54916-28-8

1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. 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: 54916-28-8

Efficient acylation of toluene and anisole with aliphatic carboxylic acids catalyzed by heteropoly salt Cs2.5H0.5PW12O40 was written by Kaur, Jaspal;Kozhevnikov, Ivan V.. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2002.SDS of cas: 54916-28-8 This article mentions the following:

Heteropoly salt Cs2.5H0.5PW12O40 is a highly efficient and reusable solid acid catalyst for the liquid-phase acylation of toluene or anisole with C2-C12 aliphatic carboxylic acids. In the experiment, the researchers used many compounds, for example, 1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8SDS of cas: 54916-28-8).

1-(4-(4-Methoxyphenoxy)phenyl)ethanone (cas: 54916-28-8) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. 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: 54916-28-8

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem