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  • phenolic compounds
  • Among these, flavonoids are the most widespread group of phenolic compounds and are further divided into different subclasses i.e. , chalcones, flavonols, flavones, flavanones, flavanols, isoflavones and anthocyanins, based on various substitution patterns on rings A and B as well as variations in ring C. The second most popular group of phenolic compounds are phenolic acids, which can be divided into two categories: hydroxybenzoic acids and hydroxycinnamic acids. (mdpi.com)
  • Synthesis
  • This Review describes the development of the nitrosocarbonyl HDA reaction and the utility of the resulting oxazine ring in the synthesis of a variety of important, biologically active molecules. (docme.ru)
  • carbon
  • They consist of a variety of structures divided into a number of main groups including phenolic acids, flavonoids, lignans and stilbenes depending on the number of benzene rings as well as on their structure of the carbon skeleton [ 1 ]. (mdpi.com)
  • access
  • 17 The classical head-to-tail cyclization of linear precursors to access medium-sized rings is much more difficult than the formation of 5- or 6-membered rings because of entropic and enthalpic factors. (rsc.org)
  • C double bond to generate a medium-sized carbocycle from a fused bicyclic precursor has been widely studied as an alternative method to access medium-sized rings ( Fig. 1A ). (rsc.org)
  • length
  • As for sealing the deal with a ring, it is something the couple has discussed at length, but they are still processing everything that has transpired thus far in their relationship before they take that giant step toward a lifetime commitment. (inquisitr.com)