The formation of roccellic acid, eugenitol, eugenetin, and rupicolon by the mycobiont Lecanora rupicola

Fox, Cecil H.; Huneck, Siegfried

doi:10.1016/s0031-9422(00)85570-3

Cited by 32 publications

(16 citation statements)

References 3 publications

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“…In the 1 H NMR spectrum, the hydroxyl signal at d 12.86 (1H, s) suggested the presence of an intramolecular hydrogen bond between OH-5 and C-4. The 1 H and 13 C NMR spectra of 1 were partly similar to those of eugenitol (2) [7]. The main difference was that the methyl group at C-6 in 2 was replaced by a seven-carbon side chain in 1 ( Table 1).…”

Section: S1mentioning

confidence: 76%

“…The IR (y max 1701 and 1661 cm S1 ) and 13 C NMR (d 216.7 and 182.5) signals suggested that there were one saturated and one unsaturated carbonyl groups in 1. The UV spectrum (MeOH) of 1 showed maximal absorption bands at 209 (4.35), 232 (4.18), 258 (4.00) and 291 (3.81) nm, implying that 1 was a chromone derivative [7,10]. Regarding the 8 degrees of unsaturation, there was no other ring in 1 besides the general skeleton of chromone.…”

Section: S1mentioning

confidence: 98%

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Chromones from an ascomycete, Chaetomium aureus

Zou

2010

Chinese Chemical Letters

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Section: S1mentioning

confidence: 76%

Section: S1mentioning

confidence: 98%

Chromones from an ascomycete, Chaetomium aureus

Zou

2010

Chinese Chemical Letters

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“…Among botanists who cultured the s ymbionts separately this no tion found much favor because the substances were not identified from the cultures. Even last year two authors (21) unequivocally claimed that the characteristic lichen products have a dual origin, cited the negative evidence from cultural experiments as proof, and derided the use of products re sultant from symbiosis itself in the systematics of one of the symbionts. The lichen systematists who have used chemistry in their studies have tacitly or explicitly recognized the orcinol and f3-orcinol lichen products as being of fungal origin.…”

Section: The Lichen Substancesmentioning

confidence: 99%

Chemosystematics and Ecology of Lichen-Forming Fungi

Culberson¹

1970

Annu. Rev. Ecol. Syst.

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Recent years have seen a renaissance of interest in research into the life of the lichen, that most familiar of all textbook examples of symbiosis, a fungus and an alga living together. The systematics of the lichen fungi has shifted its base from descriptive morphology alone to the chemistry of met abolic end products as an additional and fertile source of data to explain relationships. Today, chemistry is more intimately involved in the theoreti cal systematics and even in the routine identification of specimens of the lichen fungi than of any other group of plants. The present level of sophis tication in the study of the chemistry of the lichen fungi has unfortunately not been matched in the study of other aspects of the biosystematics of these plants. Cultures suitable for genetic experiments are still not possible and even no unequivocal chromosome counts exist. As a consequence, chemical and ecological data that have been gathered from "natural experi ments" and that could not at present have been obtained from herbarium or laboratory studies take on increased significance as they give insight into the nature of variation in populations. In this review I shall try, not only to sketch the present status of chemosystematics and associated ecology in the study of the lichen fungi, but also to outline something of the peculiar biol ogy of these double plants, answering where possible the questions that I have come to anticipate from intelligent biologists. THE LICHEN-FORMING FUNGI

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“…3 Flavonoids 4 are the chromones that are also most abundantly distributed in nature. Peucenin, 5 eugenitol 6 and isoeugenitol 7 are some commonly occurring chromones. The chromones are also well known for their antioxidant, 8 biocidal, 9 wound healing, 10 anti-inflammatory, 11 antiulcer, 12 and immune-stimulatory 13 activities.…”

Section: Introductionmentioning

confidence: 99%

Chromones and bischromones: an account of photoinduced reactions

Kumar¹,

Yusuf²

2006

Arkivoc

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This account provides a survey of phototransformations of chromones occurring through the cycloadditions, oxidations, isomerizations and reorganizations. Photochemistry of the variety of bischromones occurring through intramolecular photo-H-abstractions and thus leading to angular tetracyclic photoproducts has also been reviewed. In the bischromones, the photoproduct formations and their distributions were found to be dependent upon the length and structure of the intermediate spacer units.

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The formation of roccellic acid, eugenitol, eugenetin, and rupicolon by the mycobiont Lecanora rupicola

Cited by 32 publications

References 3 publications

Chromones from an ascomycete, Chaetomium aureus

Chromones from an ascomycete, Chaetomium aureus

Chemosystematics and Ecology of Lichen-Forming Fungi

Chromones and bischromones: an account of photoinduced reactions

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