1-[5-(4,5-Dimethyl-1,3,2-dioxaboro­lan-2-yl)thio­phen-2-yl]ethanone and 4-(4,4,5,5-tetra­methyl-1,3,2-dioxa­borolan-2-yl)benzaldehyde

In both title compounds, C₁₀H₁₃BO₃S, (I), and C₁₃H₁₇BO₃, (II), the mol­ecules adopt nearly planar conformations. The crystal packing of (I) consists of a supra­molecular two-dimensional network with a herringbone-like topology formed by self assembly of centrosymmetric pairs of mol­ecules linked via dipole–dipole inter­actions. The crystal structure of (II) consists of a supra­molecular two-dimensional network built up from centrosymmetric pairs of mol­ecules via π–π inter­actions. These pairs of mol­ecules are self-organized in an offset fashion related by a symmetry centre, generating supra­molecular ribbons running along the [101] direction. Neighbouring ribbons are stacked via complementary van der Waals and hydro­phobic methyl–methyl inter­actions.