Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN: 9780618974122
Author: Andrei Straumanis
Publisher: Cengage Learning
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Chapter 9, Problem 13CTQ
In a synthetic transformation, reagents that must be added in separate steps are written over differentsynthetic-step reaction arrows, or given different step numbers, or both.
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The Wittig sequence includes this/these reaction step/s.
O nucleophilic substitution of a phosphine on an alkyl halide
O acid-base reaction removing a hydrogen from the carbon next to the phosphonium group to form an ylide
O the aldehyde or ketone combines with the ylide to form an oxaphosphetane
O the oxaphosphetane breaks down to form the alkene and a phosphine oxide
O all of the above
O none of the above
Please correct answer and don't use hend raiting
Here is the same figure as in the previous two questions, but omitting the red circles.
Cys157
Cys157
Cys157
His296
His296
His296
LOH
HN
HN
HN N?
-CO2
CH2
Asn329
Asn329
Asn329-
Cys157
His296
LOH
HN H HyC.
Asn329
Which of the following roles is played by the imidazole side chain of His296? Pick the one best
[ Select ]
answer.
Chapter 9 Solutions
Organic Chemistry: A Guided Inquiry
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- Write a reaction equation sequence for the following synthetic conversion. Eachreaction step must be represented by a complete reaction equation in which substrate,reagents and products are shown. Mechanisms are not required.arrow_forwardDraw the products for the following reactionarrow_forwardDraw the enol tautomer of (a) and the keto tautomer of (b).arrow_forward
- Only one of these statements about nucleophilic aromatic substitution is true. O as the number of ortho and para electron withdrawing groups increases, the reaction rate decreases O the reaction proceeds by an addition-elimination mechanism the reaction involves a carbocation intermediate with delocalization of electrons all are falsearrow_forwardBased on Markovnikov’s rule, draw only the Major product for the following asymmetrical addition (hydration) reactionarrow_forwardDifferentiate reversible and irreversible denaturation. Give 1 example to each denaturation process.arrow_forward
- Curved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and follow the arrows to draw the missing intermediates and product formed in this reaction. Include all lone pairs and charges as appropriate. Ignore inorganic byproducts.arrow_forward3) Complete the synthetic scheme by providing the missing structures for each synthetic step. Tf₂NH, H₂O 1 1) NaOH 2) H₂CBr 2arrow_forwardFor the SN2 reaction, draw the major organic product and select the correct (R) or (S) designation around the stereocenter carbon in the organic substrate and organic product. Include wedge‑and‑dash bonds and draw hydrogen on a stereocenter.arrow_forward
- The following molecules are subject to substitution (SN1 or SN2) reaction conditions. a) Identify if the leaving group (-Br) is attached to a 3°, 2°, 1°, or methyl Carbon. b) Rank the molecule with respect to their SN1 reactivity, with 1 being the fastest and 4 being the slowest. c) Rank the molecule with respect to their SN2 reactivity, with 1 being the fastest and 4 being the slowest. Br Br CH3B Br a. type of Carbon on C-Br b. SN1 reactivity (1 fastest, 4 slowest) c. SN2 reactivity (1 fastest, 4 slowest)arrow_forwardDraw an energy diagram for each reaction in Problem 20.28, paying attention to the relative energies of the overall reactants, overall products, and any intermediates.arrow_forwardIn a Wittig reaction, a ketone or aldehyde reacts as an electrophile with a nucleophile called a Wittig reagent (or phosphonium ylide) to produce an alkene. The Wittig reagent is commonly synthesized first in a two-step process beginning with an alkyl halide, then reacted with the carbonyl compound. In this problem, you'll explore the mechanism of a multi-step synthesis to make an alkene using the Wittig approach.arrow_forward
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