First Quiz Key - the designated protons at the compounds...

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Chemistry 301A Quiz 1, Fall 2009 100 points (10 points toward final grade) Score _____________ Name _________________________________ Section _________ Time – 25 minutes 1. Enter the missing reagents or product into the boxes in the Scheme given below (10 pts/each). 2. Write the organic product of the following Wittig or Wittig-type reactions (10 pts/each). O OMe + + CH P O OEt OEt + O P EtO OEt CH 2 O OMe CH 2 P O OEt OEt Br O OEt H H O OMe P OEt OEt EtO Na + - OEt H O H H H H OMe O cis trans trans, trans -2 or EtBr (B) O H O H P(O)(OEt) 2 O MeO (2 molar equivalents) NaOMe (3 eq) MeOH/1,2-dimethoxyethane + (A) PPh 3 + H O THF -78 o C H H H cis trans (-2) H H MeO O trans H O OMe stereochemistry (-2) trans
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Chemistry 301A Quiz 1, Fall 2009 (3) Use the chemical shift predictor tables at the end of this quiz to estimate the chemical shift of
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Unformatted text preview: the designated protons at the compounds given below. You must show your calculations and provide a brief explanation for your answer (10 pts/each). 1.20 + 2.30 + 0.30 = 3.80 ppm 1.20 + 0.55 + 1.10 = 2.85 ppm (4) Calculate the difference in the absorbance frequency in Hz for two signals that appear at 1.0 and 2.5 ppm on an NMR spectrum obtained using 500 MHz field strength magnet (10 pts). (1.5 ppm)(500 Hz/ppm) = 750 Hz (5) Draw the splitting pattern for the protons of ethyl bromide (CH 3 CH 2 Br) (10 pts.) Cl Cl H H A B O R O R H H...
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First Quiz Key - the designated protons at the compounds...

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