Assign E or Z stereochemistry to the following compound (red = 0): SH3 3-omon-1-(3) enelb-E,t-s A ne od vndeimerlopenade duob odt of vijeimeroo919 40 ngiza/
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- Assign R or S configuartion to the following molecules.By considering the stereochemical requirements for E2-elimination, and using an appropriate illustration need help indicating whether the more stable conformer (conformer B) of trans-1 can undergo E2 elimination. Thank you :)Giventhefollowingsetofreactionsandtheirenthalpies,drawtheBorn-Habercyclefortheformationof LiCl(s)anddeterminethelatticeenergyforLiCl.Reactions:H (in kJ)(1)Li(s)Li(g);Hs= 161;(2) Li(g)Li+(g)+e–;IE= 520;(3) ½Cl2(g)Cl(g);½BE =121.5;(4)Cl(g)+ e–Cl–(g);EA= –349;(5)Li+(g)+ Cl–(g)LiCl(s);UL= ?(UL= latticeenergy)(6) Li(s)+ ½ Cl2(g)LiCl(s);Hof=–408.6._______________________________________________________________________________
- What organic product is formed when 1‑methylcyclopentene is treated with NMMO in the presence of H2O and a catalytic amound of OsO4? Clearly show stereochemistry by drawing a wedge and dashed bond for each chiral carbon. Only draw one stereoisomer if more than one can be formed.Do Sn2 reactions always happen with inversion of stereochemistry, and does the stereocenter always change from R to S or S to R?For the given ee values, calculate the percentage of each enantiomer present. Q: 90% ee
- Why does the melting point (70-71) above match neither the enantiomers’ nor the racemate’s? Does it mean that the substance is impure, or perhaps isn’t even ibuprofen at all? (Racemic mixture:75-77C, Enantiomer:52-53C)One of the following molecules (a)–(d) is d-erythrose 4-phosphate, an intermediate in the Calvin photosynthetic cycle by which plants incorporate CO2 into carbohydrates. If d-erythrose 4-phosphate has R stereochemistry at both chirality centers, which of the structures is it? Which of the remaining three structures is the enantiomer of d-erythrose 4-phosphate, and which are diastereomers?What is the stereochemical configuration of the enantiomer of (2S, 4R)-2, 4-octanediol? (A diol is a compound with two —OH groups.)
- Allenes are compounds with adjacent carbon-carbon double bonds. Many allenes are chiral, even though they don’t contain chirality centers. Mycomycin, for example, a naturally occurring antibiotic isolated from the bacterium Nocardia acidophilus, is chiral and has [α]D = -130. Explain why mycomycin is chiral.Consider a solution made up of 90% R and 10% S. What is the enantiomeric excess (ee%) of the R enantiomer?(I) Give major products for 1,2-/1,4 additions (A) Diels-Alder (B-D) cycloadditions, [2+2] cycloaddition, and Retro-Dial-Alder (E) cycloaddition. Illustrate the regiochemistry and stereochemistry (meal, enantiomer, exo or Endo) for cycloaddition B-D.