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- Which molecule is labelled with the correct R and S descriptors? Br., R Br., R Br... S в кон ОА ов ос OD A R В S OH C OH R Br., S D S OHA B C D E 1. NaBH4 2. H3O+ 1. CH3MgBr 2. H3O+ 1. (CH3)2CuLi 2. H3O+ 1. CH3Li 2. H3O+ 1. (CH3CH2)2CuLi 2. H3O+The pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms. How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?
- 1. Assign the E and Z configuration to the following compounds. HOH-C H₂C NC. H₂CH₂C N E CH3 H CH3 CSN-CHEM 241L-Experiment 7: Stereochemist CH₂OH HOH₂C. CI H₂CO₂C. HO₂C N H OCH3 CH₂CH34. The structure provide is of (+)-4-bromo-2-methylpent-2-ene, what is the absolute configuration of the asymmetric center in (-)-4-bromo-2-methylpent-2-ene? Draw the structure of (-)-4-bromo- 2-methylpent-2-ene and assign the absolute configuration of its asymmetric center. Br 5. For structures A-C, determine the type of radical. A D B b. (2R)-chloro-(5R)-methyloctane E 6. Convert the following IUPAC name into a Lewis structure with dashed/wedge bonds to properly show the stereochemistry at the two chiral/asymmetric centers. a. (3S)-bromo-(5S)-methylheptane C major F 7. Give a curved arrow-pushing mechanism for the following reaction and make sure to include all nonbonding electrons. CLEARLY Indicate the initiation, propagation and two termination steps, one which should account for formation of the minor product. Br₂ Br + minor4) Assign R or S configuration to the following molecules: H Br CH2CH2CH2 CH3 CH3 -CH2CH3 NH2 H3C- H. H3C CH(CH3)2 H CH2CH3 CH2CH3 -CH3 HO. CH=CH2 H,C- CH3 CH3 CH, H CH(CH3)2
- 9. How many stereo centres are there in the following molecule? OH2. Carbenes undergo cyclopropanation reactions with alkenes. It is known that the carbene approaches the alkene in a non-linear rather than a linear fashion. Provide a depiction of the relevant HOMO and LUMO orbital interactions that explain this preference for the non-linear trajectory. Linear H H H H VS. H-C. Non-Linear (Favored) H₂ H H HConstruct a model of butan‑2‑ol and also a model of its mirror image. Construct a model of 2‑bromobutane and also a model of its mirror image. a. Draw each structure and their mirror images using wedges and dashed wedges. b. How many stereocentres are present in butan‑2‑ol and 2‑bromobutane?
- 2. The following molecule is one enantiomer of methylenedioxymethamphetamine (MDMA). 2a. Circle all of the stereocenters in MDMA 2b. Assign the absolute stereochemistry (R or S) for each stereocenter .CH3 HN H H *CH33. Assign R or S configuration to the chirality centers of the following molecules; Cl CH3 CH3 а) b) HO C СООН СООН H;C H CH,CH3 H Br ОН CH,CH3 VIl. H ОН e) f) d) Cl H H OCH3 Br H. Br ...|| h) СООН HOCH, H3C CH310. In the UV-visible spectrum of (E)-1,3,5-hexatriene, the lowest energy absorption corresponds to: A) a o to a transition. B) a o to n* transition. C) an to o* transition. D) a o to o" transition. E) an to n" transition.