Draw the structure of any diastereomer of (2R,3S)-dichloropentane. Take particular care to indicate three-dimensional stereochemistry detail properly.

what is the stereochemistry involved in the rducing benzil experiment. And write the definition and give examples of : meso compound, racemic mixture, enantiomer, and diastereomer.

1) The ¹H NMR spectra of carvone and the epoxidation product(s) are extremely complicated, so we've only given you partial spectra (from 8 3.0 -7.0 ppm), showing the double bond regions. There are three peaks in this region in the carvone spectrum, corresponding to Ha, H, and H. Based on chemical shift or coupling considerations, assign the peaks for H₂ and Hb/c (you can't distinguish between H, and Hc, so just label both peaks Hbic). H₂C 80 Transmittance [%] 30 40 50 60 70 80 6.8 6.6 ****** ¹H spectrum (partial) of (D)-(+)-carvone ¹H spectrum (partial) of unknown epoxidation product 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4 6.2 6.0 5.8 5.6 5.4 ✓ Carvone IR.jpg BRUKER 3500 8895 *** He 3000 H₂₂ (D)-(+)-carvone 5.2 5.2 5.0 4.8 f1 (ppm) 2500 5.0 f1 (ppm) Ha -CH3 Ⓒ 4.6 2000 Wavenumber cm-1 4.6 4.4 4.2 4.0 4.2 4.0 3.8 1645.58- 1500 r 3.8 3.6 3.6 1000 3.4 S 3.4 3.2 3.0 3.2 3.0 500

Show that the (S,S) enantiomer of this (R,R) diastereomer of 1-bromo-1,2-diphenylpropane also undergoes E2 elimination to give the cis diastereomer of the product. (We donot expect these achiral reagents to distinguish between enantiomers.)

A) Considering compounds 2a through 2l, identify: 1)one pair of geometric isomers 2)two pairs of enantiomers and 3)three pairs of identical molecules B) Give the names, including the configurations, of each of the geometric isomers and of each of the enantiomers identified in 1A and 1B. Draw the relevant structures. C) Sort compounds 2a, 2b, 2c, 2f and 2k in order of increasing solubility in water and briefly justify.

(a) Draw all other stereoisomers of the molecule , labelling meso forms (if any), and assign descriptors to chiral carbon atoms.   (b) Including molecule below, label pairs of enantiomers and pairs of diastereomers.   (c) If you were to distill a mixture of all the isomers, how many fractions could be obtained, and what is in each fraction?