From water, phloroglucinol crystallizes as the dihydrate, which has a melting point of 116 117 �C, but the anhydrous form melts at a much higher temperature, at 218 220 �C . It does not boil intact, but it does sublime.
42.
The enzyme pyrogallol hydroxytransferase uses 1, 2, 3, 5-tetrahydroxybenzene and 1, 2, 3-trihydroxybenzene ( pyrogallol ) to produce 1, 3, 5-trihydroxybenzene ( phloroglucinol ) and 1, 2, 3, 5-tetrahydroxybenzene.
43.
However, it is likely that the production of TATB will be switched over to a process involving the nitration and transamination of phloroglucinol, since this process is milder, cheaper, and reduces the amount of ammonium chloride salt produced in waste effluents ( greener ).
44.
Condensed tannins can undergo acid-catalyzed cleavage in the presence of a nucleophile like phloroglucinol ( reaction called phloroglucinolysis ), thioglycolic acid ( thioglycolysis ), benzyl mercaptan or cysteamine ( processes called thiolysis ) leading to the formation of oligomers that can be further analyzed.
45.
The enzyme pyrogallol hydroxytransferase uses 1, 2, 3, 5-tetrahydroxybenzene and 1, 2, 3-trihydroxybenzene ( pyrogallol ), whereas its two products are 1, 3, 5-trihydroxybenzene ( phloroglucinol ) and 1, 2, 3, 5-tetrahydroxybenzene.
46.
According to linkage type, phlorotannins can be classified into four subclasses, i . e ., phlorotannins with an ether linkage ( fuhalols and phlorethols, fuhalols are constructed of phloroglucinol units that are connected with para-and ortho-arranged ether bridges containing one additional OH-group in every third ring ), with a phenyl linkage ( fucols ), with an ether and a phenyl linkage ( fucophlorethols ) and with a dibenzodioxin linkage in eckols and carmalols ( derivatives of phlorethols containing a dibenzodioxin moiety ), most of which have halogenated representatives in brown algae.
47.
The species contains phlorotannins of the classes of phlorethols and fucophlorethols ( phloroglucinol, difucol, tetraphlorethol-E, pentaphlorethol-B, hexaphlorethol-A, fucotriphlorethol-G, fucotriphlorethol-H, fucotetraphlorethol-J, fucotetraphlorethol-K, fucopentaphlorethol-E, bisfucoheptaphlorethol-A, difucofucotriphlorethol-A, difucofucotetraphlorethol-B, terfucohexaphlorethol-B, terfucoheptaphlorethol-A, diphlorethol, triphlorethol-A, tetraphlorethol-C, fucophlorethol-B, fucodiphlorethol-D, fucotriphlorethol-B, fucotetra-phlorethol-B, bisfucotriphlorethol-A, bisfucotetraphlorethol-A, bisfucopentaphlorethol-A, bisfucopentaphlorethol-B, difucophlorethol-A, difucofucotetraphlorethol-A, terfucopentaphlorethol-A and terfucohexaphlorethol-A ).
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