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Two new compounds, 8-(3,4,5-trimethoxybenzylidene)-6,10-dioxaspiro[4,5]decane-7,9-dione (J1) and 8-(3,4,5-trimethoxybenzyl)-6,10-dioxaspiro[4,5]decane-7,9-dione (J2) have been designed and generated by the reaction of 3,4,5-trimethoxybenzaldehyde with 6,10-dioxaspiro[4,5]decane-7,9-dione in different solvents. The 3,4,5-trimethoxybenzyl group of the two compounds connects with the dioxaspiro group via double bond (J1) and single bond (J2), respectively. The crystal structure determinations show that Compound J1 belongs to the triclinic system, space group P-1 with a = 5.4056(11) A, b = 11.465(2) A, c = 13.502(3) A, α = 92.06(3)° A, β = 91.35(3)°, γ = 93.50(3)°, C18H20O7, Mr = 348.34, V = 834.4(3) A3, Z = 2, Dc = 1.386 g/cm3, F(000) = 368. Compound J2 is also of the triclinic system, space group P-1 with a = 8.8778(18) A, b = 9.5285(19) A, c = 11.082(4) A, α = 89.69(3)°, β = 67.38(3)°, γ = 81.68(3)°, C18H22O7, Mr = 250.36, V = 854.9(3) A3, Z = 2, Dc = 1.361 g/cm3, F(000) = 372. Both compounds form three-dimensional network structures via C–H···O intra- and intermolecular hydrogen bonds.

Design and Crystal Structures of Two New Compounds Fused with 3,4,5-Trimethoxybenzyl Group and 6,10-Dioxaspiro Group