Acetals are formed from a mixture comprising alcohols and aldehydes and the product is distilled to yield purified alcohols and/or acetals and/or unsaturated ethers.

 
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< 1-3-bis(substituted phenyl)-3-hydroxypropan-1-one or 2-propen-1-one compound, and salt thereof

> Polymeric fluorescent substance and polymer light-emitting device using the same

> Salt suitable for an acid generator and a chemically amplified resist composition containing the same
~ 00598