Draw structure of product formed in cyanohydrin synthesis of ( S)- glyceraldehyde. Which products are chiral, which show optical activity, and what is the isomeric relationshio of these product.
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Draw structure of product formed in cyanohydrin synthesis of ( S)- glyceraldehyde. Which products are chiral, which show optical activity, and what is the isomeric relationshio of these product.
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- Quinapril (trade name Accupril) is used to treat high blood pressure and congestive heart failure. One step in the synthesis of quinapril involves reaction of the racemic alkyl bromide A with a single enantiomer of the amino ester B. (a) What two products are formed in this reaction? (b) Given the structure of quinapril, which one of these two products is needed to synthesize the drug?Quinapril (trade name Accupril) is used to treat high blood pressure and congestive heart failure. One step in the synthesis of quinapril involves reaction of the racemic alkyl bromide A with a single enantiomer of the amino ester B. (a) What two products are formed in this reaction? (b) Given the structure of quinapril, which one of these two products is needed tosynthesize the drug?22:43 10. Provide the following: the resonance structure of the intermediate that can resonate into the other intermediate that is given the product that results from the given resonance structure Specify which product is the kinetic product and which is the thermodynamic product . OH 50% H₂SO4 H~
- What is the product of the starting material D-glyceraldehyde which will (1) produce aldaric acid upon reacting with HNO3 + H2O, NaOCH2, NH2OH, and (CH3CO)2O + NaOCOCH3 (2) produce tartaric acid upon reacting with HNO3 + H2O, NaOCH3, NH2OH, and (CH3CO)2O + NaOCOCH3Predict the products formed when the following sugars react with excess acetic anhydrideand pyridine.(a) a-d-glucopyranoseGive the products expected when (+)@glyceraldehyde reacts with HCN.(b) What is the relationship between the products? How might they be separated?(c) Are the products optically active? Explain.
- Which one of the following statements about arene oxides is FALSE? O The NIH shift is what makes arene oxides carcinogenic. O Ring opening of an arene oxide can afford an addition product and/or a rearranged product. O Large polycyclic aromatic hydrocarbons such as benzo[a]pyrene are especially susceptible to arene oxide formation. The NIH shift mechanism was discovered at the National Institutes of Health. O Cytochrome P450 is the powerful biological oxidant that epoxides an arene to give an arene oxide.Which reaction below give a par of diastereomers and Why?Which of the following produces only butanoic acid (CH3CH2CH2 CO2H) being 'hydrolyzed in acid medium?
- Is toremifene chiral? If so, which of the possible stereoisomers are formed in this synthesis?A key step in the synthesis of the narcotic analgesic meperidine (tradename Demerol) is the conversion of phenylacetonitrile to X. (a) What isthe structure of X? (b) What reactions convert X to meperidine ?Ribose, a carbohydrate with the formula shown, forms a cyclic hemiacetal, which, in principle, could contain either a four-membered, five-membered, or six-membered ring. When D-ribose is treated with methanol in the presence of an acid catalyst, two cyclic acetals, A and B, are formed, both with molecular formula C,H,0, These are separated, and each is treated with sodium periodate (Section 10.8C) followed by dilute aqueous acid. Both A and B yield the same three products in the same ratios. он о CHO СНО H+ CH,OH A +B ÕH 1. NalO, 2. H,0* НО CHO + CHOH + CH,OH ÕH CH,OH Isomeric cyclic acetals with molecular formula CH12O, D-Ribose (C;H1605) From this information, deduce whether the cyclic hemiacetal formed by D-ribose is four- membered, five-membered, or six-membered.