C. 2H₂O (4 diastereomers expected) H3CO. H3CO J 0 1) Overnight THF 2) H3O+ (4 diastereomers expected)

Draw the structure of any diastereomer of (2 S S , 3 R R )-2,3-dichloropentane.

Name the compound

A student performed a series of reactions and obtained the spectral data provided. The reaction sequence is shown below.. What are the structures for A, B, C, and D? Compound B NMR (relative integrated areas below peaks) CH;CH,O°N 1. BHTHF N-bromosuccnimide A CH;CH,OH B 2. H,O,/OH- D hv reflux Compound A NMR (relative integrated areas below peaks) PPM 5 Compound B IR INFRARED SPECTRUM PPM 5 1 6 0.8 Compound A IR INFRARED SPECTRUM 0.6 0.8 0.4 0.4 0.2- 3000 2000 Wavenumber (cm-1) 1000 The MS of compound B shows an M+ peak at 198 and an M+2 peak at 200 with a relative abundance of 1:0.97 2000 Wavenumber (cm-1) 3000 1000 Transmitance Relative Transmittance

If 25.5mg of triethylmethanol is produced when 0.100mL of methyl propanoate and 0.200g of ethyl magnesium bromide react, what is the % yield? CH3CH₂CO₂CH3 + Methyl propanoate 2 CH3CH₂MgBr + 2 H+ → (CH3CH₂)3COH + CH3OH + 2 MgBr* Ethyl magnesium bromide triethylmethanol methanol

In the 1HNMR spectrum for 4-methylphenylboronic acid, assign the variousresonances to the hydrogen nuclei responsible for them.

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Name the following Cd(C2H3O2)4

2. (Chapter 13 - Q58b) The compound whose H NMR spectrum is shown has the molecular formula C7H7B1. Follow the following questions to predict the unknown structure. Chem. shift Rel. area 2.31 1.50 701 1.00 7.35 1.00 TMS 10 7 6 O ppm 4 3 2 Chemical shift (8) e20s Cenge leaming 2(a) Degree of the unsaturation of this compound is= 2(b) The two distinct peaks in the aromatic region of the H NMR indicate that compound is .disubstituted = 2(c) The splitting pattern of the peak at 2.31 ő is = 2(d) The group that corresponds to the splitting pattern in 1(c) is = 2(e) This compound has the plane of symmetry Yes or No = 2(f) The name of the unknown compound = Intensity

23Na has no NMR frequency. What is its magnetogyric ratio? A) 101.1 x 10\^7 T-1 s-1 B) 26.75 x 10\^7 T-1 s-1 C) 7.081 x 10\^7 T-1 s-1 D) 0.9377 x 10\^7 T-1 s-1