4. Draw the product of the hemiacetal and the acetal formed from the combination of the...
12.24 Draw structural formulas for the hemiacetal and then the acetal formed from each pair of reactants in the presence of an acid catalyst: (See Example 12.6) +CH CHH (a) CHCCHs ib! OH CHO+CH3OH (c)
Be sure to answer all parts. Draw the hemiacetal and acetal formed when the carbonyl compound is treated with two equivalents of the given alcohol in the presence of H2SO4. CH2CH2 CH2 CH3 + CH3OH Hemiacetal : draw structure ... Acetal : draw structure ...
7. The reaction sh own below illustrates the acid-catalyzed hydrolysis of an acetal into a hemiacetal. H3o* NH Draw the complete arrow pushing mechanism that accounts for products shown above. (8 pts)
Draw the reaction mechanism for the formation of hemiacetal and the acetal in the acid-catalyzed reaction of propanone with ethanol
Draw structures of lactol/cyclic hemiacetal or cyclic acetal formed from intramolecular cyclization of the hydroxy aldehydes/ketones9-6.jpg
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
Draw the mechanism and the product(s)for the acid-catalyzed reaction of (S)-4-chloro 2-pentanone with 2 moles of methanol; indicate which is the hemiacetal and the acetal structures. Consider how would the mechanism and the product be different if the same ketone underwent acid hydrolysis in the absence of methanol? Also, consider the reversibility of the above mechanisms.
What products are formed by hydrolysis of the acetal? Draw the structure of the larger organic product. OCH3 -C- H OCH3 draw structure ... = = = = = = = = + 2 equivalents of (select)
Another Nuclelophilie Addition Reaction: Addition of Alcohols to make Hemiacetals and Acetals You will need to predict products of these reactions. But you do not need to be able to draw out the mechanisms.) OH R-OH c-OR OK -&-OR | RoH H' catalyst H' catalyst Ketone/Aldehyde Hemiacetal Acetal Show the following reaction: Cyelohexananone + Methanol (excess). Show the starting material, the hemiacetal intermediate and the acetal product. + CH₂OH Hemiacetal Do problem 19.15. pg. 720 Draw the acetal product for...
Propose a structural formula for the acetal formed from the pair of reactants shown below in the presence of an acid catalyst. Assume an excess of the alcohol is used. MeOH You do not have to consider stereochemistry. In cases where there is more than one answer, just draw one.