SThe following enantiomer of a chiral epoxide is an intermediate in the synthesis of the insect pheromone frontalin. OH Using the Sharpless epoxidation, show how this enantiomer can be prepared from an allylic alcohol.
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- Ammonia and amines react with epoxides with the same stereospecificity as anionic nucleophiles. Draw a sawhorse or Newman projection formula for the product of the reaction shown, clearly showing the stereochemistry at both chirality centers. What are the Cahn–Ingold–Prelog R,Sdescriptors for these chirality centers in the reactant and the product?The chiral hydroxyl compound P, C7H14O contains a five-membered ring and showspositive result in iodoform test. Compound P and sodium bromide can be produced byrefluxing compound Q with aqueous NaOH solution. Compound P is heated withbenzoic acid in the presence of concentrated H2SO4 to form a sweet-smelling product,compound R. Deduce the structure of P, Q and R. PLEASE PROVIDE CLEAR HAND WRITING AND SOLUTIONSSharpless epoxidation of allylic alcohol X forms compound Y. Treatmentof Y with NaOH and C6H5SH in an alcohol–water mixture forms Z. Identifythe structure of Y and draw a mechanism for the conversion of Y to Z.Account for the stereochemistry of the stereogenic centers in Z. Z hasbeen used as an intermediate in the synthesis of chiral carbohydrates.
- Show how you would synthesize each compound using methylenecyclohexane asyour starting material. If a chiral product is shown, assume that it is part of a racemicmixture.A compound with the formula C8H12 absorbs two equivalents of H2 on Catalina reduction over a palladium catalyst to give compound A. Ozonalysis oxidative cleavage of the unknown compounds gives two compounds B and C.What allylic alcohol and DET isomer are needed to make each chiralepoxide using a Sharpless asymmetric epoxidation reaction?
- Friedel–Crafts alkylation of benzene with (R)-2-chlorobutane and AlCl3 affords sec-butylbenzene.a. How many stereogenic centers are present in the product?b. Would you expect the product to exhibit optical activity? Explain, with reference to the mechanism.An acid–base reaction of (R)-sec-butylamine with a racemic mixture of 2-phenylpropanoic acid forms two products having different melting pointsand somewhat different solubilities. Draw the structure of these twoproducts. Assign R and S to any stereogenic centers in the products.How are the two products related? Choose from enantiomers,diastereomers, constitutional isomers, or not isomers of each other.When attached halohydrin is treated with NaH, a product of molecular formula C4H8O is formed. Draw the structure of the product and indicateits stereochemistry.
- Compound J, C16H16Br2, is optically active. On treatment with strong base, compounds K and L (each C16H14) are formed; K and L each absorb only 2 equivalents of hydrogen when reduced over a Pd/C catalyst. Compound K reacts with ozone to give phenylacetic acid (C6H5CH2COOH), while similar treatment of L gives 2 products. One product, M, is an aldehyde with formula C7H6O; the other product is glyoxal (CHO)2. Draw the structure of compound L.Clopidogrel is the generic name for Plavix, a drug used to prevent the formation of blood clots in patients that have a history of heart attacks or strokes. A single enantiomer of clopidogrel can be prepared in three steps from the chiral αhydroxy acid A. Identify B and C in the following reaction sequence, and designate the conguration of the enantiomer formed by this route as R or S.Chiral alcohols can be converted to chlorides by several pathways. Which is the best way to make the chloride with retention of configuration?