Densitymass 1028 gml 06 gml 95 ethanol mpbp mp 19 20

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Density/mass % 1.028 g/ml - 0.6 g/ml 95% ethanol - MP/BP Mp: 19-20 ° C - Mp: 318 ° C Mp: -114 ° C Mp: 113-114 ° C
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Results Product: 3,4-methylenedioxychalcone Crude Yield (mass, %) 0.4534g, 89.93% Final Yield (mass, %) 0.3864g, 76.64 % Description (state, color) 116-119 ° C Melting Point Range  Yellow Crystals NMR sample (solvent) CDCl 3 Mass Spectrum Data (m/z) given 252.0782  FT IR (diamond anvil, neat) 3064.81, 3009.32 cm -1  (sp2 C-H stretch), 2925.11 cm -1  (sp3 C-H stretch), 1657.83  cm -1  (C=O, ketone), 1604.71 cm -1  (C=C stretch)  1 H NMR 1H NMR (400 MHz, CDCl3)  7.99 (dddd, J=7.0, 3.6, 1.8, 1.6 Hz, 2H,  a ), 7.72 (d, J=15.6 Hz, 1H,  b ),  7.56 (tt, J=7.2, 1.4 Hz, 1H,  c ), 7.49 (ddd, J=15.6, 2.3, 0.6 Hz, 2H,  d ), 7.35 (d, J=15.6 Hz, 1H,  e ), 7.17-7.09 (m,  2H,  f/g ), 6.83 (d, J=8.0 Hz, 1H,  h ), 6.02 (s, 2H,  i Discussion   A chalcone (3,4-methylenedioxychalcone) was successfully synthesized from acetophenone by aldol condensation with benzaldehyde unknown B. Several spectroscopic techniques such as infrared spectroscopy, 1 H NMR, and melting point were utilized to characterize the product. The infrared spectrum exhibited 2 stretches at 3064.81 cm -1 and 3009.32 cm -1 and an additional stretch at 2925.11 cm -1 , indicating the presence of sp3 C-H and sp2 C-H bonds, respectively. The ketone stretch and more significantly, the C=C stretch confirms the aldol condensation occurred between the acetephenone and benzaldehyde. Interpretation of the mass
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