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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The four possible tautomers of ascorbic acid were studied by the semiempirical MINDO/3 and MNDO methods. The most stable tautomer 1 corresponds to that identified in solution and solid state by the  13 C-NMR and X-ray techniques, respectively. Its estimated structural parameters are in reasonable agreement with data obtained by the combined use of X-ray and neutron dif­ fraction methods. The MNDO bond angles exhibit a dramatic improvement over the MINDO/3 ones. The most acidic proton corresponds to the O-H bond attached to the ring in the immediate neighbourhood of the side chain.

On the Relative Stability of Ascorbic Acid Tautomers