(+)-Usniacin CAS#: 7562-61-0

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(+)-Usniacin

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(+)-Usniacin Basic information

(+)-Usniacin Chemical Properties

Melting point:201-203 °C(lit.)
alpha 488 º (c=0.4, CHCl3)
Boiling point:399.43°C (rough estimate)
Density 1.2869 (rough estimate)
refractive index 1.4790 (estimate)
storage temp. 2-8°C
pka4.00±0.40(Predicted)
optical activity[α]25/D +488°, c = 0.7% in chloroform
Water Solubility Partly soluble in water. Soluble in acetone, ethanol, chloroform and furfural.
Merck 14,9893
BRN 96698
CAS DataBase Reference7562-61-0(CAS DataBase Reference)

Safety Information

MSDS

(+)-Usniacin Usage And Synthesis

Contact allergensUsnic acid is a component of lichens, also used as a topical antibiotic. Allergic contact dermatitis from lichens occurs mainly occupationally in forestry and horticultural workers, and in lichen pickers.
Purification MethodsThis very weak acid is the natural form which is recrystallised from Me2CO, MeOH or *C6H6. At 25o it is soluble in H2O (<0.01%), Me2CO (0.77%), EtOAc (0.88%), MeOCH2CH2OH (0.22%) and furfural (7.32%). [Curd & Robertson J Chem Soc 894 1937, Barton & Brunn J Chem Soc 603 1953, resolution: Dean et al. J Chem Soc 1250 1953, synthesis: Barton et al. J Chem Soc 538 1956, Beilstein 18/5 V 586.]

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