5-Hydroxy-8,8-dimethyl-10-(2-methylbut-3-en-2-yl)-2H,6H-7,8-dihydropyrano[3,2-g]chromene-2,6-dione
نویسندگان
چکیده
In the title compound, C(19)H(20)O(5), the pyran ring is in an envelope conformation, whereas the benzene and dihydro-pyran ring system is planar with an r.m.s. deviation of 0.0190 (1) Å. The hy-droxy group is coplanar with the attached benzene ring [r.m.s. deviation = 0.0106 (1) Å]. An intra-molecular O-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol-ecules are linked into chains along the b axis by weak C-H⋯O inter-actions. These chains are stacked along the a axis. C-H⋯π and weak π-π inter-actions [centroid-centroid distance = 3.7698 (7) Å] are also observed.
منابع مشابه
7,7-Dimethyl-3,3,4a-tris(3-methylbut-2-enyl)-4a,5,6,7-tetrahydro-2H-chromene-2,4(3H)-dione
The title compound, C(26)H(38)O(3), was prepared by an intra-molecular Claisen-like cyclization of ethyl 2-acet-oxy-4,4-dimethyl-1-(3-methyl-but-2-en-yl)cyclo-hex-2-enecarboxyl-ate followed by dialkyl-ation. One of the methyl groups is disordered over two sets of sites in a 0.67:0.33 ratio.
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