(8-Hy-droxy-6-meth-oxy-1-oxo-1-isochromen-3-yl)methyl formate: a supra-molecular framework.

In the title compound, CHO, an intra-molecular O-H⋯O hydrogen bond forms an (6) ring motif. The mol-ecule is essentially planar with an r.m.

Crystal structures and Hirshfeld surface analyses of 6,8-dimeth-oxy-3-methyl-1-isochromen-1-one and 5-bromo-6,8-dimeth-oxy-3-methyl-1-isochromen-1-one chloro-form monosolvate.

In the mol-ecule of 6,8-dimeth-oxy-3-methyl-1-isochromen-1-one, CHO, (), the two meth-oxy groups are directed with respect to each other. In the mol-ecule of the brom-inated derivative, 5-bromo-6,8-dimeth-oxy-3-methyl-1-isochromen-1-one, that crystallized as a chloro-form monosolvate, CHBrO·CHCl, ( ), the meth-oxy groups are directed to each other. In the crystal of , mol-ecules are linked by bifurcated C-H⋯O hydrogen bonds, forming chains along the -axis direction.

The crystal structure, Hirshfeld surface analysis and energy frameworks of 2-[2-(meth-oxy-carbon-yl)-3,6-bis-(meth-oxy-meth-oxy)phen-yl]acetic acid.

In the title compound, CHO, (), the meth-oxy-carbonyl [-C(=O)OCH] and the acetic acid [-CHC(=O)OH] groups are inclined to the benzene ring by 79.24 (11) and 76.71 (13)°, respectively, and are normal to each other with a dihedral angle of 90.

The crystal structure and Hirshfeld surface analysis of 1-(2,5-di-meth-oxy-phen-yl)-2,2,6,6-tetra-methyl-piperidine.

In the title compound, CHNO, the piperidine ring has a chair conformation and is positioned normal to the benzene ring. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, forming chains propagating along the -axis direction.