Crystal structure of 3-hy-droxy-2-(4-hy-droxy-3-meth-oxy-phenyl-methyl)-5,5-di-methyl-cyclo-hex-2-enone.

In the title compound, C16H20O4, a new starting compound for the synthesis of various heterocycles, the partially saturated six-membered ring adopts a sofa conformation. An intra-molecular O-H⋯O hydrogen bond is observed in the guaiacol residue. In the crystal, mol-ecules are assembled into a sheet structure parallel to the ab plane via O-H⋯O hydrogen bonds. The hydrogen-bond pattern is described by an R44(28) graph-set motif. The sheets are further linked by C-H⋯O hydrogen bonds into a three-dimensional network.