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overall outline of the reaction:
benzaldehyde => benzoin => 1,2-diphenyl-1,2-ethanediol => 1,2-diphenyl-1,2-ethanediol + 2,2-dimethoxypropane => 2,2-dimethyl-4,5-diphenyl-[1,3]dioxolane.
1) Use the H NMR spectrum of the purified cyclic acetal to identify the major diastereomer From borohydride reduction. There are no minor diastereomers. Draw its structure including stereochemistry. Determine the ratio between major:minor.
2) Explain the stereoselectivity from the crude H NMR of the cyclic acetal.
An empty beaker has a mass of 42.889 g. 10.00 mL of NaCl solution are placed in the beaker. The mass of the beaker and solutionis 54.129 g.
Explain in general terms what a reference sample is and what its purpose is in spectrophotometry.
salicylic acid reacts with methanol to produce oil of wintergreen and water. If water is added to the solution, a precipitate is formed. identify the precipitate and explain why it is formed.
Nitrogen and oxygen gases react to form dinitrogen trioxide gas. 2 N2(g) + 3 O2(g) -> 2 N2O3(g) At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2.
Enough of a monoprotic acid is dissolved in water to produce a 0.0131 M solution. The pH of the resulting solution is 2.48.
A piece of magnesium with a mass of .2 grams is added to 50mL of 1 molarity of HCL at a temperature of 28 degrees celcius. When the magnesium disolves the solution reache a temperature 46 degrees celcius.
If the total pressure is 1.8 atm, what is the partial pressure of ethanol?
Commercially available concentrated sulfuric acid is 18M. calculate the volume of this acid that is required to prepare
If it takes 66.8 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1?
Find the amount of known substance present in the mixture and determine the mass of calcium carbonate present in original mixture.
Organelles compartmentalize a cell like a department store displays similar items together. What advantage does such compartmentalization offer a large cell and what are two examples of oraganelles and the activities they compartmentalize?
If a sample with an initial activity of 15 mCi(microcurries) is injected into a patient, what is the activity in 24 hours, assuming that none of the sample is excreted?
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