(±)-(3'a,3'b,6'a,7'a)- and (±)-(3'a,3'b,6'a,7'a)-2,3,3a,3b,4,5,6,6a,7,7a-decahydro-5,5-dimethylspiro[1,3-dioxane-2,5'-pentaleno[2,1-b]furan]-2'-one

J. W. Bats, S. H. Öhlinger and J. Mulzer

Synopsis: The crystal structures of the title compounds, (±)-(3^'a,3^'b,-6^'a,7^'a)-, (I), and (±)-(3^'a,3^'b,6^'a,7^'a)-, (II), have been determined at 134 and 135 K, respectively. The pentaleno[2,1-b]furan group has an endo conformation in (I) and an exo conformation in (II). The axial C-C bond attached to the spiro center is about 0.02Å longer than the equatorial C-C bond.

Formula: C₁₅H₂₂O₄ and C₁₅H₂₂O₄

	Structure factor file (CIF format) (197.9 kbytes) Contains datablock I
	Structure factor file (CIF format) (194.1 kbytes) Contains datablock so206

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