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1. Give a step-by-step mechanism (showing appropriate curly arrows) for the formation of an imminium ion from the components shown below. How does the imminium ion compare to the precursor a,13-unsaturated aldehyde in terms of reactivity (specify what the other reaction partner might be when describing the reactivity differences)?
2. Draw the enantiomer of proline which would give rise to the absolute stereochemistry shown in the reaction below. Justify your answer by showing the key intermediate in the catalytic cycle and show a stereochemical model for the C-N bond formation.
3. Predict the product of the reaction shown below. Is the mode of catalysis is `enamine' or 'imminiumi. Draw a proposed catalytic cycle for the transformation. How does the catalyst activate the substrate?
4. Predict the precursor in the reaction shown below. Is the mode of catalysis 'enamine' or 'imminium'? Draw a proposed catalytic cycle for the transformation. How does the catalyst activate the substrate?
A buffer that contains 0.347 M of a base, B and 0.483 M of its conjugate acid BH+, has a pH of 8.08. What is the pH after 0.00713 mol of HCl are added to 0.442 L of the solution
The concentration of glucose in blood is approximately 90 mg/100 mL. What is the weight/volume percent concentration of glucose. what is the molariy of glucose
What is the resulting temperature when 35 g of water at 75C is mixed with 15 g of water at 15C? (The specific heat of water is 4.184 J/g x C.)
How much heat is evolved when 265 g of ammonia gas condenses to a liquid at its boiling point
A sample conaining both HCl and HNO3 had a density of 1.083g/ml. A 30.00 ml amount of this sample required 25.78 ml of 0.3248 M NaOH for titration. Another 30.00 ml amount of this sample required 24.47 ml of 0.1327 M AgNO3 for titration
What compounds will be present after chemical reaction has occurred. Write out a balanced chemical reaction for this description, and name all compounds present.
You have 75.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 1.52 M solution of AgNO3(aq). Calculate the concentration of CrO4 2- after the two solutions are mixed together.
Consider the reaction: C2H5OH (l) + 3O2 (g) --> 2 CO2 (g) + 3 H2O (l) , ?H= -1.37 x 103 kJ When a 24.8-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
For phenylanaline can be modeled as particle on a ring. Calculate the probability of finding electrons in one half of the ring from the ground state
Write the half-reactions that occur in the two electrode compartments. (Type your answer using the format [Ag] for Ag and Ag for Ag. Also, the first box gets the coefficient)
If the sample of the complex ion compound that you prepared had not thoroughly dried, but contained traces of water or ethanol would this make your value of x too high or too low? Or would it not affect your results at all? Explain.
What is the "mass per volume" percent sodium hypochlorite content of your household bleach product?
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