What is the stereochemical result of a SN1 reaction that occurs at an asymmetric carbon? A) retention B) rearrangement C) inversion D) racemization
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What is the stereochemical result of a SN1 reaction that occurs at an asymmetric carbon? A) retention B) rearrangement C) inversion D) racemization
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- PQ-17. How is this reaction characterized? (A) only regioselective (B) both regioselective and stereospecific (C) only stereospecific (D) neither regioselective nor stereospecific ~ 1) KMnO4. OH, 0°C 2) H₂O4. What stereochemical descriptor is used to describe the stereochemistry in the following molecule? Br a) R b) S c) E d) Z e) cis f) transSN2 reactions involving chiral electrophiles usually proceed with: A) inversion of configuration B) retention of configuration C) slightly more inversion than retention D) slightly more retention then inversion E) equal amounts of inversion and retention of configuration
- Regioselectivity/Stereoselectivity of SN2 & SN1 reactions SN2 SN1What is the stereo-chemistry of the following reaction? Br O=0 CH3C-OH Racemization None anti-periplanar anti-racemization Inversion17) Specify the stereochemistry (R or S) at each of the following stereocenters. Write your answers in the boxes provides. Br H3C H •H • OH CH2CH3 SH ОН
- C2H5 =N H OH Identify the correct stereochemistry E/Z and syn/anti in the following compound. OA sulfonium ion (R3S+) is a stereogenic center if three different alkyl groups are bonded to sulfur because sulfur is surrounded by four different groups, including its lone pair. In assigning an R or S) is a stereogenic center if three different alkyl groups are bonded to sulfur because sulfur is surrounded by four different groups, including its lone pair. In assigning an designation to sulfur, the lone pair is always assigned the lowest priority (4). SAM, S -adenosylmethionine, is a biologically active sulfonium ion that we will learn about in Section 7.16. Locate all the stereogenic centers in SAM, and assign an R,S designation to each center.poovide a camplete arrow pushing mechanism dor tue folladg erchor a) Ho + O= cft2 the HO Cofts Hz0 C6 Hs
- Which reaction must take place with retention of configuration at the stereogenic center? Он HC1 ✓ Br ✓ Br PC13 OH Елон O More than one of these choices. None of these choices. лад1) Identify the stereochemical relationship between the following molecules (enantiomers, diastereomers, same molecule, meso compound) CH3 OH a) and relationship CH2CH3 Br b) and (R)-2-bromobutane relationship HIH DOH H3C CH3 OH c) and relationshipWhich structure is consistent with a 1 transition state? 2 CH3 CHs H.C CH 4 3