140C midterm 2 key

140C midterm 2 key - Chemistry 140C Spring, 2010 Second...

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Chemistry 140C TOTAL POSSIBLE: 250 Spring, 2010 POINTS MISSED: - 0 Second Midterm Exam-250 points 5/25/10 TOTAL: 250 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO. ....FILL OUT THE FOLLOWING INFORMATION NOW : . LAST NAME (Print): KEY FIRST NAME (Print): Ima PID: __________________________________________________ SIGNATURE: __________________________________________ ID checker initials: ____________________ If you wish to have any answers considered for a re-grade, your exam must be completed in INK .
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(55 points) On the templates provided, draw D-Sorbose in its β -furanose and β - pyranose forms. Next, answer the questions that follow with respect to D- Sorbose: CH 2 OH O OH H H HO OH H CH 2 OH D-Sorbose CH 2 OH OH H HOH 2 C H OH HO H O H O OH OH CH 2 OH H OH H OH H H What is the chirality of the anomeric carbon in both closed forms (circle answer)?: R S Mutarotation of the pyranose form shown above will produce an isomer. List the three terms that would all describe the relationship between these two isomers: (1) D I A S T E R E O M E R S (2) E P I M E R S (3) A N O M E R S List the number of equivalents (eq.) of each of the single carbon products formed via exhaustive degradation of D-Sorbose with excess periodoic acid: 3 eq. formic acid 2 eq. formaldehyde 1 eq. carbon dioxide
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140C midterm 2 key - Chemistry 140C Spring, 2010 Second...

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