Add time:07/11/2019         Source:sciencedirect.com

Publisher SummaryThis chapter describes progress in the chemistry of 1,3,5-tri-hydroxybenzene(phloroglucinol), 1,2,3-trihydroxy (pyrogallol) and 1,2,4-isomers, and polycyclic compounds in the series. Although benzenoid members have a number of industrial uses, a variety of polycyclic systems are widely distributed naturally and the group has continued to attract interest because of the extensive number of complex derivatives possessing such polyhydroxy and methoxy substitution patterns. Developments particularly in the past decade are described in this chapter. While no new synthetic methods for this group have appeared, improvements in the synthesis of phloroglucinol and that of some of its derivatives have attracted attention. The classic route by the way of trinitrotoluene, trinitrobenzoic acid, triaminobenzoic acid and its hydrolysis, and decarboxylation has been challenged by methods based on the use of acyclic precursors. Coumarin, chromone, and flavenol ring formation represent the main development.

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