Question

what is the theoretical yield of anisalacetophenone and dibenzalacetone formed? thank you.

The Aldol Condensation Precautions: Acetone, ethanol and acetophenone are flammable; work in a fume hood. Sodium hydroxide is a strong base and can cause severe skin burns and eye damage. Safety goggles are required. Gloves are recommended. Purpose To carry out two Aldol condensation reactions in which no heat is needed to obtain the condensation product. The two reactions differ in the number of enolizable protons at the c- carbon. Part A Reaction Scheme Preparation of anisalacetophenone from the reaction of acetophenone with p-anisaldehyde under basic conditions NAOH EIOH OCH 1, acetophenone d 1.055 OCHE 2. anisaldehyde d 1.119 Procedure: To a 25 ml flask, add the following: acetophenone (2 mL). p-anisaldehyde (2 mL) and 95% ethanol (6 mL). Using a Pasteur pipette, add 10 DROPS of 50% aqueous sodium hydroxide and stir the reaction mixture for 13 to 15 minutes. Place the reaction flask in an ice bath (clamp if necessary) and wait until you have crystals; they may take some time to form. Collect the yellow crystals by suction filtration and wash them with ice-cold water (10 mL) followed by ice-cold 95% ethanol (20 drops). Before the washings, pack down the crystals on the filter using the back of a spatula, Recrystallize the product from hot methanol (remember to use a hot water bath to heat an organic solvent)! Be sure to include hot gravity filtration, however, you do not need to use charcoal. Pure trans-anisalacetophenone melts at 77-78 °C. Obtain a melting point and an IR spectrum of your material Waste Disposal Dispose of the filtrate from the reaction in the basic aqueous waste container. Dispose of the filtrate from recrystallization in the non-halogenated waste container.

Answer 1

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114 mo1 MW 120 OCH ...136 A 1.10: 234 de 1055 gold -0.0176 2 2 ml of acetophenome = 1-055 g/m2 < 2 min mol 2 ml of p-anis aldehyole 31ong gamit a 2 m2 = 2629897 99 001645 1 mol of acetophenone will react with 1 mol of p.anisalder hycle to give 1 mot of trans-anisalacetophenone So, 001645 mol of acetophenone & pranis aldehyde will react to give than 0.01645 mol of trans-anisalaceto- phenone ... Theoratical geild of the condensation polt is a (o-oidhsa 934) = 308493 g (100%. geild) MOH F1017 m. 58 M.1. 16 4 .w.=234 d: 0·791 glans d = 10449/anit a Gg. here, the amount of acctone and benzaldehyde are not available. so, this is meaningless to calculate the geild of dibenzalacktone. since, og dibencalacctone should be formed. so, this is theoratical geild. Amount of acetone & benzaldemy de can be determined. og dibenzalacetone c 0.0256 mol 0.0256 mol dibenzalacetones o 0 256 mol acetone 0.0512 mol benzaldehyde i.Amount of acciones 0.0256 * 58-140541465. 0791 Se . Amount of benzaldehgale co*0512 * 136=6*9639 = 66963 6.923 mi