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Two novel spiro compounds,3-benzylidene-1,5-dioxaspiro[5.5]undecane-2,4-dione 1 and 3-(2-fluorobenzylidene)-1,5-dioxaspiro[5.5]undecane-2,4-dione 2,have been synthesized and characterized by X-ray single-crystal diffraction,IR and elemental analysis.Compound 1 belongs to the monoclinic system,space group P21/n with a=12.326(3),b=5.6420(11),c=20.089(4),β= 101.79(3)o,C16H16O4,Mr= 272.29,V=1367.7(5)3,Z=4,Dc=1.322g/cm3,F(000)=576,μ(MoKa)=0.095 mm-1,the final R=0.0420 and wR=0.1159.Compound 2 is of monoclinic system,space group P21/n with a=12.283(3),b=5.6367(11),c=20.055(4),β=102.00(3)o,C16H15FO4,Mr=290.28,V=1358.2(5)3,Z=4,Dc=1.420 g/cm3,F(000)=608,μ(MoKa)=0.110 mm-1,the final R=0.0353 and wR=0.0860.
Two novel spiro compounds, 3-benzylidene-1,5-dioxaspiro [5.5] undecane-2,4-dione 1 and 3- (2-fluorobenzylidene) -1,5-dioxaspiro [ , have been synthesized and characterized by X-ray single-crystal diffraction, IR and elemental analysis. Compound 1 belongs to the monoclinic system, space group P21 / n with a = 12.326 (3), b = 5.6420 20.089 (4) β = 101.79 (3) o C16H16O4 Mr = 272.29 V = 1367.7 (5) 3 Z = 4 Dc = 1.322 g / cm3 F (000) = 576 μ ) = 0.095 mm-1, the final R = 0.0420 and wR = 0.1159.Compound 2 is a monoclinic system, space group P21 / n with a = 12.283 (3), b = 5.6367 (11), c = 20.055 (4) (, Β = 102.00 (3) o, C16H15FO4, Mr = 290.28, V = 1358.2 (5) 3, Z = 4, Dc = 1.420 g / cm3, F (000) = 608, μ (MoKa) = 0.110 mm -1, the final R = 0.0353 and wR = 0.0860.