. . . "t solvents for this reaction include aromatic hydrocarbons such as xylene and toluene, alcohols -such as butanols and pentanols, and glycol ethers such as methoxyethanol, ethoxyethanol, methoxypropanol, butoxyethanol,methoxybutanol, glycol dimethyl ethers and diglycol dimethyl ethers and the like." . .