The crystal and molecular structure of leucothelephoric acid hexamethyl ether

Natural Terphenyls: Developments since 1877

“…An unique terphenylquinone pigment, volucrisporin ( 103 ), was isolated from Volucrispora aurantiaca (Scheme ). , The leuco-dibenzoate ( 104 ) of aurantiacin is accompanied in Hydnellum species by aurantiacin ( 5 ) . The leuco-permethyl ether ( 105 ) of thelephoric acid occurs in minute amounts in the indigo-blue-colored mycelial mats of Pulcherricium caeruleum (= Corticium caeruleum ), and its structure has been established by X-ray crystal analysis (Scheme ). , …”

2-(4-Dibenzofuranyloxy)-2-methylpropionic acid

“…The C(4)-C(5)-O(14) angle is enlarged to 128.1 °, which is also the case for the corresponding angle in leucothelephoric acid hexamethyl ether (Silverton, 1973), deoxyanisoin and p,p-dimethoxybenzophenone (Norment & Karle, 1962). This is probably due to steric interactions between H(4) and the H atoms of the methyl groups of the side chain [e.g.…”

“…The unit cell is oriented with the c axis horizontal, the a axis vertical and the b axis pointing towards the reader. (Banerjee, 1973;Dideberg, Dupont & Andr6, 1972;Silverton, 1973) but oriented perpendicularly towards each other.…”

Structural diversity and biological activity of natural p-terphenyls

“…Hexamethyl ether of leuco-thelephoric acid (167) was isolated from the basidiomycete Corticium caeruleum. Its structure was determined by direct method using counter-measured X-ray data (Silverton 1973;Weisgraber et al 1972). Leuco-peracetates of thelephoric acid (168) possesses six acetyl groups and was isolated from the fruiting bodies of the basidiomycete Boletopsis leucomelaena (Jägers et al 1987b).…”