Domingo Madrigal

Three new diarylbutane lignans from the resin of Bursera fagaroides

Three new diarylbutane lignans, named 9-acetyl-9′-pentadecanoil-dihydroclusin (1), 2,3-demethoxy-secoisolintetralin monoacetate (4) and dihydroclusin monoacetate (5), have been isolated from the resin of Bursera fagaroides, together with two known ones, 2,3-demethoxy-secoisolintetralin diacetate (2) and dihydroclusin diacetate (3). The complete structure assignments were obtained by means of 1H and 13C NMR spectra.

(2-tert-Butyl-5-hy­droxy­methyl-1,3-dioxan-5-yl)methanol

In the title compound, C10H20O4, the dioxane ring adopts a chair conformation. The tert-butyl group occupies an equatorial position, and is staggered with respect to the O atoms of the dioxane ring. In the crystal, molecules are connected by O—H⋯O hydrogen-bonds into zigzag chains of R 4 4(8) and R 2 2(12) ring motifs that run parallel to the a axis.

Benzene-1,3,5-triyl tris­(methane­sulfonate)

In the molecule of the title compound, C9H12O9S3, the two methanesulfonate groups re located one above and one below the ring plane. The C—O—S angle range is 119.3u2005(2)–121.1u2005(2)°. This conformation is different from that of the benzene analog 1,2,5-tris(p-toluenesulfonate), which is a three-legged ‘table’ with all fragments of the p-toluenesulfonate on top of the benzene ring. In the crystal, the supramolecular aggregation is completed by the presence of C—H⋯O hydrogen bonds.