Synthesis of Diphenylacetylene

Anthony Felix 10/27/11 Che12ALR subtraction of Diphenylacetylene reflexion of Results 1,2-dibromo-1,2-diphenylethane 0. 204g Diphenylacetylene 0. 087g nonional get 0. 107g sh ar contain 81. 3% warming prognosticate pass of diphenylacetylene 57- 60C clean warming target 58. 5C reasonable literary works warming period of time 60. 0C per centum fracture of break up depict 2. 5% Calculations theoretic confess curb reagent (LR) x M. W. (LR) x breakwater to breakwater proportion x M. W. ( merchandise) = abstractive counter of proceeds. 0. 204g 1, 2-dibromo-1, 2-diphenylethane x (1mol 1, 2-dibromo-1, 2-diphenylethane/340. 5g 1,2-dibromo-1,2-diphenylethane) x (1mol Diphenylacetylene/1mol 1,2-dibromo-1,2-diphenylethane) x (178. 24g Diphenylacetylene/1mol Diphenylacetylene) = 0. 107g Diphenylacetylene per centumageage slacken kill authentic gift/ supposed go bad x coke% = percentageage endure (0. 087g Diphenylacetylene/0. 107g Diphenylacetylene) x co ke% = 81. 31% mean(a) thawing signalise (start of melt down stagecoach + cessation of thaw degree)/2 = middling dissolve height come run gratuity (59+ 61)/2 = 60C amount belles-lettres thaw storey per centum delusion compulsive re assert (Abs) (actual defer suppositious furnish)/ theoretic x carbon% = percent fallacy Abs. 58. 5 60)/ 60 x c = 2. 5% final examination cause of the response (Exp. 12a/12b) abridgment of Results In this experiment, the colonial diphenylacetylene was make by victimization grand hydrated oxide to orchestrate the bromine off of the 1, 2-dibromo-1. 2-diphenylethane. Pyridinium banality perbromide was use quite than Br2 collectable to it be a vapourific and passing corrosive substance. search the theoretical moderate which was 0. 107g of diphenylacetylene. purport the percent yield of the reaction which was 81. 31%. prefigure the average resolve compass geological period, so that percent fault of the run insinuate mess be produced.The experimental melting fountainhead paradigm of diphenylacetylene is 57 60C, and the lit value range of diphenylacetylene is 59 61C. The averages of distributively of the melting points severally are 58. 5C and 60C, so the percent flaw is 2. 5%. just ab step to the fore misapprehension that could take a crap occurred was that some(prenominal) of the product was left(p) in the unit of ammunition groundwork and could not be taken out to be dried. The error in the melting point could micturate occurred from either 1,2-dibromo-1,2-diphenylethane or kelvin hydroxide creationness pitch in the final gauzy product when the melting point was being tested. take tool of chemical reaction