The α- and β-epoxides of 3β-acet­oxy-5α-lanost-9(11)-en-7-one

The structures of 3β-acet­oxy-9α,11α-ep­oxy-5α-lanost-9(11)-en-7-one and 3β-acet­oxy-9β,11β-ep­oxy-5α-lanost-9(11)-en-7-one, C₃₂H₅₂O₄, differ in their respective substituted cyclo­hexa­none rings but adopt similar conformations in the other three rings. In both of the crystal structures, weak inter­molecular C—H...O inter­actions are present.

Tetra­kis(1-naphthyl­amino)silane and its tetra­hydro­furan tris­olvate

In both title structures, C₄₀H₃₂N₄Si and C₄₀H₃₂N₄Si·3C₄H₈O, the angles around the Si atom deviate significantly from the tetra­hedral value [104.34 (7)-116.63 (7)° in the nonsolvate and 99.91 (15)-116.85 (15)° in the solvate]. The amino H atoms in the solvated structure are involved in hydrogen bonding with two of the tetra­hydro­furan solvent mol­ecules.