Identify the compound that forms the cyclic hemiacetal. Draw the reaction that produces the hemiacetal. OH...
Draw structures of lactol/cyclic hemiacetal or cyclic acetal formed from intramolecular cyclization of the hydroxy aldehydes/ketones9-6.jpg
organic chemistry 3. The starting material below forms a six-membered cyclic hemiacetal in an aqueous solution: (pis) r , " a) Name the starting material b) Draw the mechanism of the reaction above. Note the role of H". c) How many stereoisomers are possible for the starting material? d) How many stereoisomers are possible for the cyclic hemiacetal? 4. Propose a mechanism for the formation of the cyclic acetal by treating acetone with ethylene glycol in the presence of an...
Draw a stepwise, detailed mechanism for the following intermolecular reaction that forms a cyclic ether. 9.58 raw a stepwise, detailed mechanism for the following intramolecular reaction that forms cyclic ether. OH HoSO H20 OH
5. a) Identify each compound below as either an acetal, a ketal, a hemiacetal or a hemiketal. b) Identify any that contain a chiral center. gar no но осна 6. Draw (a) the hydrate of each of these compounds, and (b) the product when each is heated with excess ethanol with an acid catalyst. (a) Hydrate (b) ethanol product Oy
S4. What is the cyclic hemiacetal product formed from following hydroxy aldehyde? of the 55. Identify how you could synthesize an enamine A) React a ketone or an aldehyde with a React a ketone or an aldehyde with a C) React a ylide with a primary amine. D) Roact a ylide with a secondary amine with a secondary amine. a primary amine. S6. Why is an amide less reastive to mucleophilic acyl substitution than A) Nigm is a better leaving...
23. Draw the hemiacetal product formed in the following reaction. c H3O+ + HOV omo OH -
Draw the structure of a cyclic ester that is formed when the compound shown below undergoes a reaction under acidic conditions Interactive 3D display mode OH
Question 4 Select the correct Haworth projection for B-D-erythrofuranose. CH OH ОН ОН CHOCH3 ОН CH2OH OCH3 ОН ОН ОН. он ОН он ОН ОН ОН ОН ОН — = ПІ IV о I III IV II What is the correct structure of the cyclic hemiacetal that forms under acidic conditions when 5-hydroxy-4-methylpentanal cyclizes? None of the choices are correct. OH OH O OH o OH Question 6 A double stranded DNA fragment contains 20% guanosine residues. Calculate the percentage...
Help 1. Under acidic conditions, if Z CH3 in Compound 2, Compound 1 forms. он он о 2 3 a. If ZCompound 3 forms Identify Z and determine reaction condition A. b. Use curved arrows to show how Compound 3 forms from Compound 2 using your Z and reaction condition A from Question 1a c. How does Z determine the product that forms? 2. Ambien is a prescription sedative. Draw the structures of the metabolic (hydrolysis under acid conditions) products...
37. Identify the following as hemiacetal or acetal. (2 marks) a. -CHE b. -CHE H3C- OH H9C- H CHE