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- Provide a mechanism which explains the following conversions. Include all intermediates and watch you arrows and chargesCromolyn sodium, developed in the 1960s, has been used to prevent allergic reactions primarily affecting the lungs, as, for example, exercise-induced emphysema. It is thought to block the release of histamine, which prevents the sequence of events leading to swelling, itching, and constriction of bronchial tubes. Cromolyn sodium is synthesized in the following series of steps. Treatment of one mole of epichlorohydrin with two moles of 2,6-dihydroxyacetophenone in the presence of base gives I. Treatment of I with two moles of diethyl oxalate in the presence of sodium ethoxide gives a diester II. Saponification of the diester with aqueous NaOH gives cromolyn sodium. Q.Propose a mechanism for the formation of compound I.Cromolyn sodium, developed in the 1960s, has been used to prevent allergic reactions primarily affecting the lungs, as, for example, exercise-induced emphysema. It is thought to block the release of histamine, which prevents the sequence of events leading to swelling, itching, and constriction of bronchial tubes. Cromolyn sodium is synthesized in the following series of steps. Treatment of one mole of epichlorohydrin with two moles of 2,6-dihydroxyacetophenone in the presence of base gives I. Treatment of I with two moles of diethyl oxalate in the presence of sodium ethoxide gives a diester II. Saponification of the diester with aqueous NaOH gives cromolyn sodium. Q.Propose a structural formula for compound II and a mechanism for its formation.
- Cromolyn sodium, developed in the 1960s, has been used to prevent allergic reactions primarily affecting the lungs, as, for example, exercise-induced emphysema. It is thought to block the release of histamine, which prevents the sequence of events leading to swelling, itching, and constriction of bronchial tubes. Cromolyn sodium is synthesized in the following series of steps. Treatment of one mole of epichlorohydrin with two moles of 2,6-dihydroxyacetophenone in the presence of base gives I. Treatment of I with two moles of diethyl oxalate in the presence of sodium ethoxide gives a diester II. Saponification of the diester with aqueous NaOH gives cromolyn sodium. Q. Is cromolyn sodium chiral? If so, which of the possible stereoisomers are formed in this synthesis?How would the following conversion be achieved? Please show the reaction mechanism step by stepa. Propose a mechanism for the following reaction: b. Given that ΔH° for the reaction is -42 kcal/mol and the bond dissociation enthalpies for the C¬H, C¬Cl, and O¬H bonds are 101, 85, and 105 kcal/mol respectively, calculate the bond dissociation enthalpy of the O¬Cl bond.
- Oct-1-yne (HC≡CCH2CH2CH2CH2CH2CH3) reacts rapidty with NaH, forming a gas that bubbles out of the reaction mixture, as one product. Oct-1-yne also reacts rapidty with CH3MgBr, and a different gas is produced. Write balanced equations for both reactions and identify the gases formed.Can you answer the question and explain it? With the mechanism Only g and h and ia) Convert the following b)Describe the mechanism of this reaction c)Identify G and predict the products
- 3. Suggest synthesis routes for the following conversions. Include brief reaction conditions.Explain and detail the reaction mechanism: NaBr + H2O + n-butyl alcohol = ?What is the missing product for the reaction below? What is the type of reaction involved? A. a and D B. b and C C. c and A D. d and C E. e and B