When 2-bromo-2-methylpropane is dissolved in aqueous ethanol (CH₂CH₂OH) at room temperature, a mixture of (CH3),COCH₂CH, (30%), (CH₂),COH (60 %), and (CH3)2C=CH₂ (10%) is obtained. Fully explain these results.
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- A difficult problem in the synthesis of PGF2α is the introduction of the OH group at C15 in the desired configuration. a. Label this stereogenic center as R or S. b. A well known synthesis of PGF2α involves reaction of A with Zn(BH4)2, a metal hydride reagent similar in reactivity to NaBH4, to form two isomeric products, B and C. Draw their structures and indicate their stereochemical relationship. c. Suggest a reagent to convert A to the single stereoisomer X.A difficult problem in the synthesis of PGF2α is the introduction of the OH group at C15 in the desired conguration.a. Label this stereogenic center as R or S.b. A well known synthesis of PGF2α involves reaction of A with Zn(BH4)2, a metal hydride reagent similar in reactivity to NaBH4, to form two isomeric products, B and C. Draw their structures and indicate their stereochemical relationship.c. Suggest a reagent to convert A to the single stereoisomer X.A difficult problem in the synthesis of PGF2α is the introduction of the OH group at C15 in the desired configuration. a. Label this stereogenic center as R or S. b. A well-known synthesis of PGF2α involves reaction of A with Zn(BH4)2, a metal hydride reagent similar in reactivity to NaBH4, to form two isomeric products, B and C. Draw their structures and indicate their stereochemical relationship. d. Suggest a reagent to convert A to the single stereoisomer X.
- 1. how many stereoisomers are possible for 9,10- dibromo hexadecanoic acid? 2. Addition of bromine to palmitoleic acid primarily yields a set of enantiomers, (±) -three-9,10-dibromo hexadecanoic acid. The addition of bromine is an anti-addition to the double bond (ie, it appears to occur through the intermediary of the bromonium ion). Taking into account the stereochemistry of the cis double bond of palmitoleic acid and the stereochemistry of adding bromine, Write a three-dimensional structure for (±) -three-9,10-dibromo hexadecanoic acid!The LD50 (“Lethal Dose, 50 %”) is a value used in toxicology which gives the amount of a substance required to kill 50 % of a test population. It is usually reported based on body weight. For racemic carvone LD50 is reported as 1640 mg/kg. 1. Would it consider carvone to be toxic to an average person? Explain. 2. Would it be expected this the LD50 value to be the same for each enantiomer? Explain at the molecular level in stereochemical terms.(a) How many Stereoisomers are possible for 9,10- dibromoexadecanoic acid?(b) Addition of bromine to palmitoleic acid primarily yields a set of enantiomers, (±) -three-9,10-dibromohexadecanoic acid. The addition of bromine is an anti-addition to the double bond (ie, it appears to occur through the intermediary of the bromonium ion). Taking into account the stereochemistry of the cis double bond of palmitoleic acid and the stereochemistry of adding bromine,Write a three-dimensional structure for (±) -three-9,10-dibromohexadecanoic acid!
- when s-2-butanol is allowed to stand in dilute sulfuric acid for several days, it slowly forms a racemic mixture. why this happen and put illustrateDiisopinocampheylborane (Ipc2BH) is a chiral organoborane, readily employed for the production of many asymmetric products used in total synthesis. It is a crystalline material that can be prepared as a single enantiomer via the hydroboration of two equivalents of α-pinene with borane.Explain why only one enantiomer of Ipc2BH is formed.please provide the machanisms of 1a, 1e, 1f
- EXPLAIN BY WORDS IN ORDER FOR ME TO UNDERSTAND THE GENERAL REACTION SCHEME. IN THIS CROSS-COUPLING REACTION WHICH ORGANOHALIDE (R-X) REACTS WITH ORGANOBORANE [R1B(OR)2].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.)In another part of the project, an analogue of the protease inhibitor darunavir is further developed, as shown in structure 11.Enter the correct stereochemistry for all stereo centers and the double bonds that are relevant in 11. Answer sheets at the end of the problem set can be used.