Stereum hirsutum

Wolfaardt et al. screened wood-inhabiting fungi for ability to lower the kappa number after sequential fungal treatment and kraft pulping of pine chips [89]. They found that Stereum hirsutum was especially effective, giving a 30% decrease in kappa number after nine weeks treatment. The Stereum treatment did not change the relationship between kappa number and pulp yield, viscosity, or alkali consumption. Wood terpenes (a-pinene) inhibited colonization of the chips by... 

C15H20O4, Mr 264.32, prisms, mp. 182 °C, [a], +116° (CHClj). A sesquiterpenoid of the hirsutane type from cultures of the fungus Stereum hirsutum (basidiomycetes), frequently found on dead hardwood (see also complicatic acid). 

Stereum hirsutum (Willd. ex Fr.) Fr. Isolement, Purification et Caracteristiques de P 310 (Mycosporine). Bull. soc. mycol. France 93, 39 (1977). 

The tricyclic hydrocarbon hirsutene (94), isolated recently from Coriolus consors, is a probable precursor for coriolin (95), found in C. consors, and also for hirsutic acid (96), isolated from Stereum hirsutum. In a biogenetically patterned synthesis of hirsutene, Ohfume et al. have shown that treatment of the tricyclic hydrocarbon (92) with a catalytic amount of toluene-p-sulphonic acid leads to the endo-isomer (93), in 95% yield, which by manipulation of the double bond can be... 

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