Identify the starting materials for these target molecules. Only go back one step in the reaction - meaning cleave the target molecule and translate those synthons into synthetic equivalents. N a. O Target Molecule Ph b. Target Molecule
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- 4. Circle the electrophilic and nucleophilic atoms in each substitution reaction below. Provide the neutral organic product; where a stereocenter is created, use a wavy bond to indicate a mixture of configurations or wedges/dashes for stereospecific reactions. Also, provide the dominant reaction mechanism (Sn2 or SN1) somewhere in each box. A. Br NaSEt DMF В. ELOH C. .SO2NHNA Cl + D. NaH Br- HO, DMFMelphalan, a drug used in chemotherapy, reacts with itself in the body before binding with its target, as illustrated in the mechanism below. What is the first pattern of arrow pushing seen in this reaction? (Look at the first arrow coming from the Nitrogen with a lone pair). a. rearrangementc. nucleophilic attackWhat is the rate-determining step in the mechanism of an electrophilic substitution reaction of benzene? Select one: OA. Attachment of the electrophile to benzene ring. OB. Bonding of catalyst to electrophile precursor. O C. Reformation of acid catalyst. OD. Formation of the electrophile. OE. Loss of H+ ion form arenium ion intermediate to reform aromatic ring.
- Indicate which mechanism the following reaction would proceed through. a. SN1 b. SN2 H₂SO4 OH C. SN2 with partial SN1 character d. Both SN1 and SN2 are equally possible e. Not applicable, this is not a substitution reaction6. Multi Step Synthesis. Propose a synthetic route from the reactant to the product using any reagents you need. Nalt LINH4Which of the following parameters affects the rate and kinetics of a reaction? A. Solvent medium B. Reaction temperature C. Reaction time D. Geometry and structure of the alkyl halide E. pH
- Shown in the figure is the synthesis of several compounds starting from an aldehyde. Identify the missing compound in each step. KMnO4, H* 1. 'H SOCI₂ isopropyl alcohol 3. Product no. 4 Product no. 2 Product no. 5 Product no. 3 Product no. 1 ethylamine Choose... Choose... Butanoic acid butanone N-ethylbutanamide n-butanol butanal Acetic butanoic anyhdride butane Butanoyl chloride Isopropyl butanoate 2. Sodium ethanoate 5.Question 4 4. Draw the final major product(s) for each multistep synthesis reaction. H3O* OMe H3PO4 Jones EtzNH reagent H30* 1. O3 NABH3CN PBr3 KOC(CH3)3 -OH 2. DMS NH3, H3O* Br KOC(CH3)3 1. ВНз РСС H30* 2. HаОг, ОН CH2CI22. Но ... H-O Draw the major product of this reaction. Explain your reasoning. Br₂, H₂O EtOH 1. Me₂ BuSi-CI, imidazole 2.9-BBN-H (like BH3) 3. H₂O₂, NaOH OTMS excess HBr
- Which of the following molecules would react most rapidly in a nucleophilic substiution reaction? a. 2-lodo-2-methylpropane O b. 2-Bromo-2-methylpropane c. 2-Chloro-2-methylpropane O d. They would all react at the same rate10. Explain the reaction shown below. Include the following pieces in your explanation. Identify the electrophile and the nucleophile. Draw a curved arrow mechanism for this reaction. (Assume an acidic work-up). Explain the electron flow. Indicate any regiochemical or stereochemical preferences. one b. c. d. LIAIH4 OH oneWhen will you consider water to behave as a nucleophile? a.When it donates H to the electron- poor site of a positively polarized carbon atom b.When at a neutral state and still able to donate a non-bonding pair of electrons. c.When at a neutral state and still able to exchange electrons with positively polarized carbon atom. d.None of the above is correct.