Assuming that benzaldehyde is the limiting reagent for the synthesis of stibene,

Question

Assuming that benzaldehyde is the limiting reagent for the synthesis of stibene, that stilbene is the limting reagent for the synthesis of stibene ditbromide, and that stilt ene dibromide is the ir ting reagent tor the synthesis or d nen lacet lene, what is the overall % yield of d he lace ene nom be adende gi en the percentage yveld of each step of the reaction sequence as tollows? Give only two signaficant digits if the answer is a whole number wih two digits, do not include the decimal 63% 7% 92% berzadetyde stilbene stilbenederomide dphenylacetylene Notes For our multi-step synthesis we cannot just calculate the yeld based on starting amount of benzadehyde and final amount of diphemylacetylene because your group may have been supplemented with commercial material at one or more steps In truth most chemist use an excess of the least expensive reagent to increase ther yeid So in our case benzytriphenylohosphonium chloride should probabhy be our limiting reagent Answer

Explanation / Answer

If a synthesis is a linear multistep process, then the overall yield is the product of the yields of each step. So
for example, if a synthesis has two steps, each of yield 50% then the overall yield is 50% x 50% = 25%.

So in this case the overall yield will be (0.63 x0.87 x 0.92)100 = 50%

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