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1. Write a mechanism for the bromination reaction of trans-cinnamic acid to form erythro-2,3-dibromo-3-phenylpropanoic acid. You may use Br2 rather than pyridinium bromide perbromide as the brominating reagent. Be as complete as possible and show electron flow for all steps. You should indicate clearly the mechanistic pathways that lead to each of the enantiomeric products formed in the reaction and designate all stereocenters accurately. Label both stereocenters (R or S) in each final product.
2. This reaction produces erythro-2,3-dibromo-3-phenylpropanoic acid as a mixture of two enantiomers (see Question 1 for the mechanism).
a) What is the ratio of the enantiomeric products?
b) What name is given to a mixture of enantiomers present in the ratio determined in part (a)?
Propane reacts with excess oxygen to produce carbon dioxide gas and water. What volume of CO2,measured at 27.2 °C and 0.918 atm, is produced from the reaction of 10.1 g propane with excess oxygen.
Calculate the number of moles of H2O that will be produced by the reaction of .530 moles of solid Al(OH)3 with excess aqueous HClO3
How many grams of O2 gas would occupy a 400.0 liter container when the temperature is 300.0 K and the pressure is 2.20 atm?
The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0x10^- 13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm.What fraction of the space within the atom is occupied by the nucleus?
A laboratory method of preparing oxygen gas involves decomposition of solid potassium chlorate. The products of the reaction are solid potassium chloride and oxygen gas.
What would be the pH of 87 mL of the buffer to which 8.5 mL of 0.11 M hydrochloric acid has been added?
An important reaction in the formation of photochemical smog is the photodissociation of NO2: NO2 + hv >>> NO(g) + O(g) The maximum wavelength of light that can cause this reaction
What mass of silver was in the original solution? (Assume that all of the silver was precipitated out of solution by the reaction.)
Ammonia gas reacts with hydrogen chloride according to the reaction given below, which must also be balanced. if 7.00g of NH3 is reacted with 12.0g of HCl in a 1.00L container at 25C
Half-life equation for first-order reactions: (the 1/2 in t1/2 is a subscript) t1/2=0.693/k where t1/2 is the half-life in seconds (s) , and k is the rate constant in inverse seconds (s^-1).
A certain second-order reaction (B-> Products) has a rate constant of 1.80×10^-3 M^-1xs^-1 at 27C and an initial half-life of 216 s . What is the concentration of the reactant B after one half-life?Express the molar concentration numerically.
solid carbon dioxide sublimes at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 5.00 minutes
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