Wang, Jin et al. published their research in Synthesis in 2014 | CAS: 605-94-7

2,3-Dimethoxy-5-methylcyclohexa-2,5-diene-1,4-dione (cas: 605-94-7) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive. At room temperature, ethers are pleasant-smelling colourless liquids. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil.SDS of cas: 605-94-7

Two-step synthesis of 2-(9-hydroxynonyl)-5,6-dimethoxy-3-methyl-1,4-benzoquinone was written by Wang, Jin;Hu, Xiao;Yang, Jian. And the article was included in Synthesis in 2014.SDS of cas: 605-94-7 This article mentions the following:

2-(9-Hydroxynonyl)-5,6-dimethoxy-3-methyl-1,4-benzoquinone was readily synthesized from com. available 3,4,5-trimethoxytoluene in two steps. First, 2,3-dimethoxy-5-methyl-1,4-benzoquinone (coenzyme Q0) was obtained in one step by treatment of 3,4,5-trimethoxytoluene with hydrogen peroxide under metal-free conditions, followed by free-radical alkylation with 10-hydroxydecanoic acid in the presence of potassium peroxodisulfate and silver nitrate in a mixed solvent (MeCN-H2O, 1:1) to afford the title compound in good yields (60%, based on coenzyme Q0). In the experiment, the researchers used many compounds, for example, 2,3-Dimethoxy-5-methylcyclohexa-2,5-diene-1,4-dione (cas: 605-94-7SDS of cas: 605-94-7).

2,3-Dimethoxy-5-methylcyclohexa-2,5-diene-1,4-dione (cas: 605-94-7) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive. At room temperature, ethers are pleasant-smelling colourless liquids. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil.SDS of cas: 605-94-7

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