Acta Cryst. (2009). E65, o2139  [ doi:10.1107/S1600536809030918 ]

7,7-Dimethyl-4a-(3-methyl-2-butenyl)-2-oxo-4a,5,6,7-tetrahydro-2H-chromen-4-yl benzoate

K. Möws, M. Schürmann, H. Preut and B. Plietker

Abstract: An intramolecular Claisen-like cyclization of ethyl 2-acetoxy-4,4-dimethyl-1-(3-methylbut-2-enyl)cyclohex-2-enecarboxylate followed by dialkylation yielded the bicyclic title compound, C₂₃H₂₆O₄. In both of the fused six-membered rings exist fragments of four atoms which are planar, whereas the remaining two atoms deviate by up to 0.682 (3) Å on one side of the plane of the ring containing an O atom and by up to 0.415 (3) Å on opposite sides of the other ring. The dihedral anglebetween the planar fragments of the six-membered rings is 41.76 (10)°

Online 12 August 2009

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