Abstract
The structure of a novel compound,Iupac name: bicyclo [2.4.0]-octa-1,3-dimethyl-2,3-pentan-9-methylene-8, 10-butan-diolide, which resulted on treatment of photoparthenin with BF3-etherate acetic acid, has been established uniquely by X-ray crystallography. C15H18O4 is orthorhombic, space group P212121, with the cell dimensionsa=8.444(1),b=9.964(2),c=16.239(2) A,V=1366.3(2) A3,Z=4,M r =262.3,Do=1.29,Dx=1.28 g cm−3, F(000)=560,T=293K,R=0.065 for 818 observed reflections. δ-lactone ring has a skew-boat, γ-lactone ring has an envelope, and the remaining six-membered ring has a distorted chair conformation. The four-membered ring is nonplanar. There are two intramolecular and one intermolecular short C-H⋯O interactions 2.819, 2.834, and 3.259 A, respectively, which stabilize the crystal structure.
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