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Select the true statement about the mechanism for oxymercuration-demercuration Water acts as a Bronsted acid and...
Acid Catalyzed Hydration-treatment of alkenes with water in the presence of acid catalyst leads to the...
Acid Catalyzed Hydration-treatment of alkenes with water in the presence of acid catalyst leads to the formation of alcohols. H2SO4/H2O > 150°C Mechanism Major Product Acid catalyzed dehydration goes through a carbocation intermediate. This means that the Markovnikov product is obtained when carbocation rearrangements do not occur. The need for excessively high temperatures makes this reaction of limited use in laboratory synthesis. Oxymercuration - Oxymercuration involves the addition of Hg to the alkene using mercury (II) acetate Hg(OAc) followed by...
Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry
Acid-catalyzed addition of water to an alkene yields an alcohol
with Markovnikov regiochemistry. The electrophilic H+ adds to the
sp^2 carbon with the most hydrogens to yield the most stable
carbocation intermediate, which then adds water to give the product
alcohol. To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can instead be treated with mercury(II) acetate in aqucous THF and then subsequently reduced with sodium borohydride. This reaction proceeds through a cyclic mercurinium ion intermediate which...
1. Hg(OAc)2, H20 2. NaBHA CH3 M HC CHE нас Acid-catalyzed addition of water to an...
1. Hg(OAc)2, H20 2. NaBHA CH3 M HC CHE нас Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry. The electrophilic H adds to the sp carbon with the most hydrogens to yield the most stable carbocation intermediate, which then adds water to give the product alcohol. Because a carbocation intermediate is formed, rearrangements can occur prior to the addition of water To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
What statement is TRUE about the mechanism for the reaction shown here? CH(CH) COACH CHỊ(CH3CO,CH NaOH...
What statement is TRUE about the mechanism for the reaction shown here? CH(CH) COACH CHỊ(CH3CO,CH NaOH excess heat CH,(CH2)2CO CHỊ Water attacks the carbonyl carbon to form a tetrahedral intermediate The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is CH3(CH2)2CO Na. Water deprotonates the alpha carbon.
What statement is TRUE about the mechanism for the reaction shown here? CHỊ(CH4)2COẠCH, CH,(CHỊ) CO,CH 2,...
What statement is TRUE about the mechanism for the reaction shown here? CHỊ(CH4)2COẠCH, CH,(CHỊ) CO,CH 2, CO,CH NAOH excess heat CHỊ(CH) CÓ CH, Water attacks the carbonyl carbon to form a tetrahedral intermediate. The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is CH3(CH2)2CO2Na. Water deprotonates the alpha carbon.
2 problems 1. Hg(OAC)2, H20 2. NaBHg CH3 H3C H₃C Acid-catalyzed addition of water to an...
2
problems
1. Hg(OAC)2, H20 2. NaBHg CH3 H3C H₃C Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry. The electrophilic add carbon with the most hydrogens to yield the most stable carbocation intermediate, which then adds water to give the produc Because a carbocation intermediate is formed, rearrangements can occur prior to the addition of water. To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can instead be treated with mercury...
What statement is TRUE about the mechanism for the reaction shown here? CH(CH2)2CO CH -COẠCH NaOH...
What statement is TRUE about the mechanism for the reaction shown here? CH(CH2)2CO CH -COẠCH NaOH CH3(CH)1200CH excess heat CH(CH3COACH Water attacks the carbonyl carbon to form a tetrahedral intermediate. The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is glycerol. The hydroxide deprotonates the alpha carbon. Which bases among the following is/are used for irreversible enolate formation of acetaldehyde? NaH NaOMe II LDA III NaNH2 IV NaOH y II and...
What statement is TRUE about the mechanism for the reaction shown here? CH;(CH)2CO,CH CH;(CH)2CO,CH „CO.CH NaOH...
What statement is TRUE about the mechanism for the reaction shown here? CH;(CH)2CO,CH CH;(CH)2CO,CH „CO.CH NaOH CH;(CH)12CO,CH excess heat One of the products formed is ethylene glycol. The hydroxide deprotonates the alpha carbon. The first step of the reaction involves protonation of the ester carbonyl oxygen. The hydroxide attacks the carbonyl carbon to form a tetrahedral intermediate.
11) Indicate whether the statement about nucleophilicity is or True or False: a) A species with a...
11) Indicate whether the statement about nucleophilicity is or True or False: a) A species with a negative charge is a stronger nucleophile than a similar neutral species. (True / False) b) In particular, a base is a stronger nucleophile than its conjugate acid. (True / False) c) Nucleophilicity decreases from left to right in the periodic table, following the increase in electronegativity from left to right. (True / False) d) The more electronegative elements have more tightly held nonbonding electrons...
Acid Catalyzed Hydration-treatment of alkenes with water in the presence of acid catalyst leads to the formation of alcohols. H2SO4/H2O > 150°C Mechanism Major Product Acid catalyzed dehydration goes through a carbocation intermediate. This means that the Markovnikov product is obtained when carbocation rearrangements do not occur. The need for excessively high temperatures makes this reaction of limited use in laboratory synthesis. Oxymercuration - Oxymercuration involves the addition of Hg to the alkene using mercury (II) acetate Hg(OAc) followed by...
1. Hg(OAc)2, H20 2. NaBHA CH3 M HC CHE нас Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry. The electrophilic H adds to the sp carbon with the most hydrogens to yield the most stable carbocation intermediate, which then adds water to give the product alcohol. Because a carbocation intermediate is formed, rearrangements can occur prior to the addition of water To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can...
9. Which of the following statements about enzyme catalyzed reactions is NOT true? a. Enzymes form complexes with their substrates b. Enzymes lower the activation energy for chemical reactions c. Enzymes change the Key for chemical reactions d. Many enzymes change shapes slightly when substrate binds 10. To overcome an energy barrier between reactants and products, energy must be provided to get the reaction started. This energy, which is recovered as the reaction proceeds, is called: a. Activation energy b....
What statement is TRUE about the mechanism for the reaction shown here? CH(CH) COACH CHỊ(CH3CO,CH NaOH excess heat CH,(CH2)2CO CHỊ Water attacks the carbonyl carbon to form a tetrahedral intermediate The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is CH3(CH2)2CO Na. Water deprotonates the alpha carbon.
What statement is TRUE about the mechanism for the reaction shown here? CHỊ(CH4)2COẠCH, CH,(CHỊ) CO,CH 2, CO,CH NAOH excess heat CHỊ(CH) CÓ CH, Water attacks the carbonyl carbon to form a tetrahedral intermediate. The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is CH3(CH2)2CO2Na. Water deprotonates the alpha carbon.
2
problems
1. Hg(OAC)2, H20 2. NaBHg CH3 H3C H₃C Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry. The electrophilic add carbon with the most hydrogens to yield the most stable carbocation intermediate, which then adds water to give the produc Because a carbocation intermediate is formed, rearrangements can occur prior to the addition of water. To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can instead be treated with mercury...
What statement is TRUE about the mechanism for the reaction shown here? CH(CH2)2CO CH -COẠCH NaOH CH3(CH)1200CH excess heat CH(CH3COACH Water attacks the carbonyl carbon to form a tetrahedral intermediate. The first step of the reaction involves protonation of the ester carbonyl oxygen. One of the products formed is glycerol. The hydroxide deprotonates the alpha carbon. Which bases among the following is/are used for irreversible enolate formation of acetaldehyde? NaH NaOMe II LDA III NaNH2 IV NaOH y II and...
What statement is TRUE about the mechanism for the reaction shown here? CH;(CH)2CO,CH CH;(CH)2CO,CH „CO.CH NaOH CH;(CH)12CO,CH excess heat One of the products formed is ethylene glycol. The hydroxide deprotonates the alpha carbon. The first step of the reaction involves protonation of the ester carbonyl oxygen. The hydroxide attacks the carbonyl carbon to form a tetrahedral intermediate.
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