Which of the following additions to alkenes occur(s) specifically in an anti fashion? A) hydroboration-oxidation B) addition of Br2 C) addition of H2 D) addition of H2O in dilute acid E) both A and B
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- Based on the hydrogenation reaction information, how many different alkene structures can you draw that could be Compound X? (If enantiomers are possible, count each pair of enantiomers as one structure.)Complete the following: Stereochemistry, enantio-, and regioselectivity are important. CrO3, H2SO4 a) OH Bromination of an alcohol (Sn2) type EtO₂C CO₂Et b) b) d) H3CO type NH2 a) b) H3CO type a) b) OH g) type CN CI h) acetone Swern Oxidation type type CO₂H type Доно i) Me3SICI, Imidazole OSiMe3 Et3N, CH2Cl2 Br type a) Mg°, THF Br j) b); H3O+ H2SO4 (H+) MeOH OMe type type2. Which one of these alkenes would be likely to experience a carbocation rearrangement when treated with aqueous acid (hydration)? A) B) C) D) None of these would undergo a rearrangement.
- 4) Which of the following alkene is the most stable? A) B) D)Based on the hydrogenation and the bromination reaction information, how many different alkene structures can you draw that could be Compound X? (If enantiomers are possible, count each pair of enantiomers as one structure.)Refer to the reaction energy diagram to answer parts (a) through (e). (a) The rate-limiting step is: ______. (b) The transition state for the fastest step is: _____. (c) In the third step which intermediate structurally resembles the transition state according to the Hammond postulate? _____. (d) Which step no. is endergonic? _____. (e) The number of intermediates in the overall reaction is: _____.
- What other alkene is also formed along with Y in Sample Problem 9.3 (Attached) ? What alkenes would form from X if no carbocation rearrangement occurred?What are the following alkenes, E or Z? if neither label as such as with bothIn organic chemistry, an elimination process involves the removal of the hydrogen and a halide (i.e. dehydrohalogenation), in which they are ___ to each other, forming an alkene. syn-orientation co-periplanar anti-periplanar Z- orientation
- 4. Describe in table format the following criteria for S,' reactions: (a) strength of nucleophile; (b) substrate (RX); (c) solvent; (d) kinetics; (e) stereochemistry; (f) possibility of rearrangements.Draw the alkene that would react with the reagent given to account for the product formed. ? + + H₂O **** H₂S04 • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. CH3 CH3 CHCCH3 | | OH CH3 +1a) Draw the mechanism, using good curved arrow notation, for the reaction of 2-methyl-2- butene with bromine in water, omitting any stereochemistry: b) (R)-3-butyn-2-ol is treated with 2 mol of HBr, yielding optically active Compound A (C4H8OBr2). Draw the structure of the reaction with the correct stereochemistry. c) Name Compound A above, including stereochemistry. d) Compound A is treated with HBr to yield Compound B (C4H7Br3). The resulting solution is optically inactive. Draw the product(s) obtained and explain why there is a loss in optical activity.