In the following reaction two major substitution products are formed. What relationship do these two products have? A Diastereomers В Enantiomers C A meso compound is formed Constitutional isomers E No relationship at all CI- CH3 OH Меон ÕMe
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- How can X be prepared from a constitutional isomer by a series of [2 + 2]cycloaddition reactions? Interest in molecules that contain severalcyclobutane rings fused together has been fueled by the discovery ofpentacycloanammoxic acid methyl ester, a lipid isolated from themembrane of organelles in the bacterium Candidatus Brocadiaanammoxidans. The role of this unusual natural product is as yetunknown.Although diazomethane (CH2N2) is often not a useful reagent forpreparing cyclopropanes, other diazo compounds give good yields ofmore complex cyclopropanes. Draw a stepwise mechanism for theconversion of diazo compound A to B, an intermediate in the synthesisof sirenin, the sperm attractant produced by the female gametes of thewater mold Allomyces.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):
- Qa 18. Bromination of 5a-cholestan-3-one occurs at C-2 or C-4 to give 2 regioisomers. Two unsaturated ketones with lambdamax = 230 nm and lambdamax = 241 nm are yielded during dehydrobromination. Use Woodward-Fieser rules to distinguish between the two.Rank the species below in order of increasing nucleophilicity in protic solvent. I. H2O II. CH3S— III. CH3COO— IV. t-BuO— I, II, IV, III I, III, II, IV I, III, IV, II I, II, III, IVM 6 write the principal product in a, c & e and the neccesary reactives for b, d & f in the following reactions :
- 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._______________________________________________________________________________Tranexamic acid, a drug useful against blood clotting, is prepared commercially from p-methylbenzonitrile. Formulate the steps likely to be used in the synthesis. (Don’t worry about cis-trans isomers; heating to 300 C interconverts the isomers.)Predict the major products of the following reactions, including stereochemistry whereappropriate. (2S,3R)-2-ethyl-2,3-dimethyloxirane + CH3O- >CH3OH
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