Fe3O4@SiO2–BF3 nanoparticles were prepared as a novel solid acid and effectively applied for the solvent-free synthesis of arylazo-1-naphthols at room temperature.
A new pigment, volucrisporin, has been isolated from shaken cultures of the Hyphomycete Volucrisporaaurantiaca Haskins, and characterized as 2,5-(m-hydroxyphenyl)-1,4-benzoquinone. The structure has been confirmed by synthesis of the dimethyl ether.