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- Propose mechanisms for the conversion of A to B and of B to C. What is the function of sodium amide in each reaction?trehalose is a disacharide that can be obtained from fungi sea uchins and insects. acid hydrolysis of trehalose yields only D-glucose. trehalose is hydrolysed by a-glucosidase but not b-glucosidase.methylation of trhalose followed by hydrolysis yield two molar equivalents of 2-3-4-6 -tetra-O-methyl-D-glucopyranose. deduce the structure of the trehalose using the experimental dataEsters with only one a hydrogen generally give poor yields in the Claisen condensation.Propose a mechanism for the Claisen condensation of ethyl isobutyrate, and explain whya poor yield is obtained.
- Nabumetone is a pain reliever and anti-inammatory agent sold under the brand name of Relafen.a. Write out a synthesis of nabumetone from ethyl acetoacetate.b. What ketone and alkyl halide are needed to synthesize nabumetone by direct enolate alkylation?Reaction of X and phenylacetic acid forms an intermediate Y, which undergoes an intramolecular reaction to yield rofecoxib. Rofecoxib is a nonsteroidal antiinflammatory agent once marketed under the trade name Vioxx, now withdrawn from the market because of increased risk of heart attacks from long-term use in some patients. Identify Y and draw a stepwise mechanism for its conversion to rofecoxib.Choose the product that is expected when the β-pyranose form of compound A is treated with excess ethyl iodide in the presence of silver oxide. The following information can be used to determine the identity of compound A: 1. The molecular formula of compound A is C6H12O6.2. Compound A is a reducing sugar.3. When compound A is subjected to a Wohl degradation two times sequentially, D-erythrose is obtained.4. Compound A is epimeric with D-glucose at C3.5. The configuration at C2 is R.
- 12. You can distinguish epinephrine hydrotartrate from norepinephrine hydrotartrate by? A. Water solubility B. Reactions of oxidation with iodine at different pH C. Reactions in general alkaloid precipitation reagents D. Reactions with iron(III) chloride E. Reactions in Fehling's reagent.Reaction of X and phenylacetic acid forms an intermediate Y, which undergoes an intramolecular reaction to yield rofecoxib. Rofecoxib is a nonsteroidal anti-inammatory agent once marketed under the trade name Vioxx, now withdrawn from the market because of increased risk of heart attacks from long-term use in some patients. Identify Y and draw a stepwise mechanism for its conversion to rofecoxib.Amobarbital is a sedative marketed under the trade name Amytal. Propose a synthesis of amobarbital, using diethyl malonate and urea as two of the starting materials.
- Naturally occurring compounds called cyanogenic glycosides, such as lotaustralin, release hydrogen cyanide, HCN, when treated with aqueous acid. The reaction occurs by hydrolysis of the acetal linkage to form a cyanohydrin, which then expels HCN and gives a carbonyl compound. (a) Show the mechanism of the acetal hydrolysis and the structure of the cyanohydrin that results. (b) Propose a mechanism for the loss of HCN, and show the structure of the carbonyl compound that forms.Nabumetone is a pain reliever and anti-inflammatory agent sold under the brand name of Relafen. a. Write out a synthesis of nabumetone from ethyl acetoacetate. b. What ketone and alkyl halide are needed to synthesize nabumetone by direct enolate alkylation?d-Glucuronic acid is found widely in plants and animals. One of its functions is to detoxify poisonous HO-containing compoundsby reacting with them in the liver to form glucuronides. Glucuronides are water soluble and therefore readily excreted. Afteringestion of a poison such as turpentine or phenol, the glucuronides of these compounds are found in the urine. Draw thestructure of the a- and b-glucuronides formed by the reaction of b-d-glucuronic acid and phenol.