English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The osmic acid catalyzed oxidation of p-benzoquinone by sodium chlorate has long been recognized to yield a dimeric substance. By using progressively more vigorous conditions of acetylation, it has been possible to prepare from it three acetates corresponding to the dimer and to products of increasing degrees of dehydration and aromatization. The compounds have now been identified as the tetraacetates of 1,2,6,7-tetrahydroxydibenzo-p-dioxine (2a), of 2-oxo-1,4a (trans),6,7-tetrahydroxy-1,2,4a,10a-tetrahydrodibenzo-cis-p-dioxinne (3) and of the monohemiacetal dimer of cis-5,6-dihydroxycyclohex-2-ene-1,4-dione(4b). The structure of the dimer in the solid state and in solution is discussed.

Le dimère de la cis dihydroxy-5,6 cyclohexène-2 dione-1,4