M 234, Spring 2019 Midterm #1 Ian R. Gould MPLETE TIS SETIN : Up to TW PINTS will be removed for incorrect/missing information! PRINTED FIRST NAME Answer Key Person on your LEFT (or Empty or Aisle) Person on your RIGT (or Empty or Aisle) lass you are REGISTERED FR (onground or hybrid) The room where most students will take the test for your class, i.e. LS A-191 for onground and PS -152 for hybrid) PRINTED LAST NAME **YU ARE NT ALLWED T TAKE SPARE PIES F TIS EXAM FRM TE TESTING RM** PRINT YUR NAME N EA PAGE! READ TE DIRETINS AREFULLY! USE BLANK PAGES AS SRAT PAPER work on blank pages will not be graded. WRITE LEARLY! MLEULAR MDELS ARE ALLWED D NT USE RED INK DN'T EAT, USE MMN SENSE! Li Be B N F Ne Na Mg e Al Si P S l Ar K a Sc Ti V r Mn Fe o Ni u Zn Ga Ge As Se Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag d In Sn Sb Te I s Ba Lu f Ta W Re s Ir Pt Au g Tl Pb Bi Po At Rn R N 2 R (δ, ppm) variable and condition dependent, ca. 2-6 δ R 11 220 R 10 200 9 180 8 160 7 140 Aromatic R 2 R 2 Xe 6 5 120 100 R N 2 Aromatic Ar mainly 8-6.5 2 4 80 R Interaction Energies, kcal/mol Eclipsing / ~1.0 / ~1.4 / ~2.6 Et/Et ~3.1 N Infrared orrelation hart small range usually range of values strong N broad peak 1600 1660 N 3300 N 2720 2820 N 3000 2 peaks 3100 1680 R 2200 broad with spikes ~3300 1735 2850 2960 1600 broad ~3300 2200 broad ~3000 1710 NR2 3500 3000 2500 2000 1650 (cm -1 ) 1500 NMR orrelation harts 2 X R 3 60 2 3 2 NR 2 NR 2 2 40 Gauche / ~0.9 Et/ ~0.95 i-pr/ ~1.1 t-bu/ ~2.7 Alkyl X Alkyl 3 > 2 > 1 1 20 3 > 2 > 1 0 0
M 234, Spring 2019 Midterm #1 Ian R. Gould YU MUST MPLETE TIS PAGE WIT YUR NAME (EVEN TUG YU ALREADY DID TIS N TE VER PAGE) AND ALS GIVE YUR ASU R PSTING ID NUMBER WE NEED TIS NUMBER BEAUSE YU WULDN'T BELIEVE TE NUMBER F STUDENTS WSE NAMES WE AN'T READ! PRINTED FIRST NAME PRINTED LAST NAME ASU ID or Posting ID Points by question 1 /14 2 /24 3 /39 4 /24 5 /14 6 /22 7 /38 Points Removed for cover errors /2 Extra redit /5 Total (incl Extra) /175+5 **YU ARE NT ALLWED T TAKE SPARE PIES F TIS EXAM FRM TE TESTING RM**
EMISTRY 234, Spring 2019 MIDTERM #1-2 - NAME Question 1 (14 pts.) Give the IUPA name for the following compound. Be sure to use cis/trans, E/Z or R/S where appropriate. 6 5 4 3 2 1 6-bromo-4-methylhex-(3E)-en-(2R)-ol grading- subtract 2 points each error, do not propogate errors Question 2 (24 pts). a) For the bonds indicated in the two structures below, give the acetylide anion, the organic structure it reacts with and all other required reagents/conditions to make that bond (you do not have to show how the acetylide anion is made) Na Na 1. 2. 3 + b) The bond indicated in the structure below can NT be made in an acetylide reaction. iefly explan why (1-2 sentences maximum!). bond can NT be made because it is not possible to do an SN2 reaction at an sp2 hybridized carbon atom
EMISTRY 234, Spring 2019 MIDTERM #1-3 - NAME Question 3 (first part, 18 pts.) For each reaction 1) Provide the missing major organic product or reagents/conditions as appropriate 2) State whether each reaction is an Addition, Elimination, Substitution or Rearrangement 3) State whether each reaction is Reduction, xidation or Neither a) 1 Equiv. addition neither b) Na/N 3 (l) addition reduction Question 3 (second part, 21 pts.) Give the major organic product or reagents/conditions for the following reactions D NT STATE whether the reaction is Addition/Eimination/Substitution/Rearrangement D NT STATE whether each reaction is reduction/oxidation/neither c) Excess Na 2 r 2 7 / 2 S 4 / 2 d) Na + or any strong non-bulky base e) 1. Excess LiAl 4 2. 3 + 5 pts Extra redit. Which functional group can be polymerized to form an organic metal? alcohol alkene alkyne epoxide from "-hem in Real Life" page : organic metals, week #2
EMISTRY 234, Spring 2019 Midterm #1-4 - NAME Question 4 (24 pts.) For (2R)-bromo-(3R)-methylpentane, draw a Lewis structure with wedged/dashed bonds with proper sterochemistry, draw a 3D/sawhorse structure AND a Newman projection of the conformation that would undergo E2 elimination, AND give the alkene that would be formed in an E2 elimination reaction, you do not need to show the lowest energy conformation. Et Et Et Lewis structure 3D/sawhorse structure Newman projection alkene product Question 5 (14 pts). For synthesis of the structure below 1) decide which would be the best bond to make in an SN2 reaction 2) perform retrosynthetic analysis on the bond you want to make and give the synthons 3) give the synthetic equivalents to perform the SN2 reaction, assign each one as a Lewis acid or Lewis base, and give the curved arrow pushing showing bond formation Na SN2 Lewis base Lewis acid synthetic equivalents best synthons
EMISTRY 234, Spring 2019 MIDTERM #1-5 - NAME Question 6 (22 pts.) Show how you would synthesize the target compound on the right from the starting compound on the left. Show reagents and conditions, and the structures of important intermediate compounds. Do not show any (arrow pushing) mechanisms. Na / N 3 (l) P 2 R NaN 2 P Na / N 3 (l) Na + 1. 2. 3 +
EMISTRY 234, Spring 2019 MIDTERM #1-6 - NAME Question 7 (38 pts). Give a curved arrow pushing mechanisms for the following two reactions. 1) Add non-bonding electrons and - bonds to the line-angle structures as required. 2) Indicate the Lewis acid/lewis base (LA, LB) at each INTERMLEULAR step as appropriate, and whether they are also ønsted acids/bases (, LB,BB) 3) Include ALL IMPRTANT RESNANE NTRIBUTRS for intermediates 4) GIVE TE NUMBER F STEPS IN YUR MEANISMS a) l cat. / 2 number of steps 4 2 : : b) conc. 2 S 4 heat S number of steps 5 S 2 S S