2-Chloro­methyl-2,3-dihydro­thieno[3,4-b][1,4]dioxine

In the mol­ecule of the title compound, C7H7ClO2S, the six-membered ring adopts a twisted conformation. In the crystal structure, weak inter­molecular C—H⋯O hydrogen bonds link the mol­ecules. There is also a weak C—H⋯π inter­action

2-Ferrocenyl-6-methyl­pyridin-3-ol

In the title compound, [Fe(C5H5)(C11H10NO)], the dihedral angle between the pyridyl and substituted cyclo­penta­dienyl rings is 20.4 (3)°. The H atoms of the methyl group are disordered over two positions; their site-occupation factors were fixed at 0.5. The crystal structure is stabilized by well defined inter­molecular O—H⋯N and C—H⋯O hydrogen bonds, leading to the formation of a two-dimensional network parallel to (101)

1,2,3,4-Tetra­hydro-1,4-methano­naphthalene-2,3-diol

The title compound, C11H12O2, is an inter­mediate in the synthesis of Varenicline, a nicotinic receptor partial agonist used to treat smoking addiction. In the crystal structure, there is an intra­molecular O—H⋯O hydrogen bond that generates an S(5) ring motif. Inter­molecular O—H⋯O hydrogen bonds form centrosymmetric dimers and also link these dimers into chains along the a axis

1-Chloro-2-(4-phenyl­piperazin-1-yl)ethanone

The title compound, C12H15ClN2O, is a piperazine derivative with the potential for use as a starting material for pharmaceutial and agrochemical applications. The structure is stabilized by C—H⋯O hydrogen bonds, C—H⋯π inter­actions and π–π stacking inter­actions [centroid–centroid distance = is 4.760 (2) Å]