Abstract: Phthalaldehyde tetraalkyl acetals are prepared by electrochemical oxidation of substituted xylenes and used as stable compounds for storing phthalaldehydes.

Abstract: Thin-film ionic conduction by cross-linking a polymer matrix, such as poly(ethyleneimine), with a halocarbon based diepoxide or divinyl to produce composite compounds with selective ionic conductivity and ion transport properties that can be controlled by the addition of metallic salts or protonic acids.

Abstract: A novel process is disclosed in which a membrane of a fluorinated resin containing a pendant precursor ion exchange group represented by the formula:--SO.sub.2 Xwherein X rerpesents a halogen atom, is contacted with a aqueous solution containing specific amounts of at least one alkali metal or alkaline earth metal hydroxide and at least one specific water soluble organic compound to thereby hydrolyze the precursor group while causing a specific membrane volume increase. In the process of the present invention , since the ion exchange membrane is swelled, while being hydrolyzed, to a desired degree, the rate of hydrolysis of precursor ion exchange groups is high, so that a final ion exchange membrane is free of wrinkles formed during the hydrolysis step of a conventional process and during the electrolytic operation, thereby enabling the final membrane to ensure advantageously low cell voltage and stable, prolonged electrolytic operation.