Current doubling mechanism of the photoanodic reaction of sodium formate at the ZnO electrode is re-examined. Quantitative analysis of the reaction products revealed that ZnO electrode corroded during the current doubling reaction, which has not been previously reported. However, zinc ions were formed with about 50% of current efficiency. Carbon dioxide, instead of oxygen, was formed during the reaction. These experimental observations strongly suggested mechanism proposed by earlier workers were incorrect. A new mechanism is proposed.
2‐Alkyl‐1(2‐formylphenyl‐N‐alkyliminomethyl)isoindoles were prepared by the reaction of o‐phthaldehyde with primary amines in 99% ethanol at 0°. 2‐Alkyl‐3‐alkyliminoisoindolinones were isolated from the reaction mixture as by‐products. Their formation mechanism is proposed.
The reaction of cyclooctatetraene with 1,3-diphenylisobenzofuran afforded two kinds of 1:1 [2π+4π]-cycloadducts, a cage-type 1:1 cycloadduct and two classes of 1:2 cycloadducts. The cage-type compound was formed from one of the [2π+4π]-cycloadducts via an unprecedented second [2π+4π]-cycloaddition reaction in which the double bond of the benzene moiety acted as a dienophile. A similar reaction with dimethyl cyclooctatetraene-1,2-dicarboxylate gave a 1:1 [2π+4π]-cycloadduct and a 1:2 cycloadduct. No cage-type compound was formed.
The 1,6‐disubstituted‐ and 4,6‐disubstituted‐11‐aza‐5H‐benzo[a]phenoxazin‐5‐one as well as 6‐substituted‐11‐aza‐5H‐pyrido[a]phenoxazin‐5‐one derivatives were prepared by the condensation of 2‐amino‐3‐hydroxypyridine with 5‐substituted‐2,3‐dihalogeno‐1,4‐naphthoquinones and 6,7‐dibromo‐5,8‐quinolinequinone respectively. The resulting compounds were subjected to reduction, acetylation, dehalogenation and reaction with aniline.
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