Which set of reagents will best accomplish the following transformation? A O3, Zn + H20 B 1. BH3, THF; 2) H2O, NaOH C H2O, H+ D 1. RCO3, CH2CI2; 2) H2O, H† E None of the above
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- 1. Which of the following is the strongest nucleophile? Refer to the diagram below with an MeOH, MeSH, etc. 2. Which of the following is true about the stereochemistry of SN1 reaction?a.retention of configuration at the electrophilic centerb.50:50 mixture of retention and inversion of configuration at the electrophilic centerc.inversion of configuration at the electrophilic centerd. slightly more inversion than retention at the electrophilic center[III2] Instructions: Add curved arrows to the following reactions to indicate the flow of electrons in each reaction below. Identify and label the nucleophile and electrophile. (refer to the photo below)The reaction H2C=CHCH2Br + NaN3 followed by reaction with LiAlH4 yields CH3CH2CH2NH2 H2C=CHCH2NH2 H2C=CHCH2N3 none of the above
- For problem 8.17, all of the reactions will be SN2. For each reaction, identify and evaluate each nucleophile (strong? weak? Strong or weak as a base?) Also, evaluate each solvent as polar protic or polar aprotic. I recommend drawing the structure of each solvent. (d) Sodium cyanide in dimethyl sulfoxide (e) Sodium azide in aqueous ethanol (f) Sodium hydrogen sulfide in ethanolConsider the series of the trans effect: CO, CN-, C2H4 > PR3, H-, CH3- > C6H5- > NO2-, SCN-, I- > Br- >Cl- > py > NH3 > H20 What would be the major product of the following reaction? Select one:Supply the missing reagent in the following reaction: (see attachment) A. Lindlar, H2, mCPBA B. O3 or KMnO4 C. fused KOH D. NH3 E. NaNH2
- When Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.) Propose a mechanism to account for formation of both A and BFor problem 8.17, all of the reactions will be SN2. For each reaction, identify and evaluate each nucleophile (strong? weak? Strong or weak as a base?) Also, evaluate each solvent as polar protic or polar aprotic. I recommend drawing the structure of each solvent. (g) Sodium methanethiolate (NaSCH3) in ethanolMinor product via E1 for 2-butanol and HCl?
- Tunicates are marine animals that are called "sea squirts" because when they are taken out of water, they tend to contract and expel seawater. Lepadiformine is a cytotoxic agent (toxic to cells) isolated from a marine tunicate. During a recent synthesis of lepadiformine, the investigators observed the formation of an interesting by-product (3) while treating diol 1 with a reagent similar in function to PBr3 (J. Org. Chem. 2012, 77, 3390–3400):6. Identify the best reagent(s) for this reaction. (see attached screenshot). a. H2SO4, HgSO4, H2O b. 1. Disiamylborane, 2. HO–, H2O2 c. K2Cr2O7, H+ d. NaOCl e. H2, PdThe following reaction has a ΔSsystem < 0 O2(g) → 2O(g) T or F can you explain why this is false?