Acarospora chlorophana

Figure 1-19. Raman spectrum of Acarospora chlorophana, an epilithic extremophile from Antarctica, recorded with the miniature Raman spectrometer shown in Figure 1-18...

Acarospora chlorophana has been found to exist in two chemical races (777), one producing ( —)-acaranoic acid (71) and (— )-acarenoic acid (73) in addition to rhizocarpic acid, and the other with ( + )-roccellic acid (76) and rhizocarpic acid. Acarospora oxytona (177) however produces rhizocarpic acid and (+ )-lichesterinic acid (77). The acids (71), (73), (76) and (77) have the same chirality at C-2 and C-3 and this circumstantial evidence led Huneck (777) to propose the biogenetic pathway outlined in Scheme 9, elaborating that proposed earlier by Mosbach (244). 

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