Bisresorcinol Derivatives from Grevillea glauca

Seven new and three known bisresorcinols, grevirobstol A (=5,5′‐((6 Z ,9 Z )‐hexadeca‐6,9‐diene‐1,16‐diyl)bisresorcinol; 8 ), 5,5′‐[(8 Z )‐hexadec‐8‐ene‐1,16‐diyl]bisresorcinol ( 9 ), and 2‐methyl‐5,5′‐[8 Z )‐hexadec‐8‐ene‐1,16‐diyl]bisresorcinol ( 10 ) were isolated from the stems of Grevillea glauca. The new compounds were identified on the basis of spectroscopic data as ( Z )‐6,7‐didehydroglaucone A ( 1 ), glaucones A and B ( 2 and 3 , resp.), 2‐(3‐hydroxyisopentyl)bisnorstriatol ( 4 ), 2‐(3‐methylbut‐2‐en‐1‐yl)bisnorstriatol ( 5 ), 2′‐methylgrebustol A ( 6 ), and glaucane ( 7 ).