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REVIEW Topics [References) CH HC OCH Br2 CH3 B H3C CH,OH H₂C CH₂ Electrophilic...
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Electrophilic addition of hypohalous acids to alkenes yields a 1,2-haloalcohol called a halohydrin. Halohydrin formation, however, does not result from the addition of HO-Br, for example. Instead the addition is done indirectly by reaction of the alkene with Br2 in the presence of water. The reaction also works with Cl2 to give chlorohydrins instead of bromohydrins. The reaction proceeds through a cyclic intermediate known as a bromonium ion. In the second step of the reaction, water is the nucleophile and reacts with the...
2 problems (Review Topical (References Br н,слен . CH2Cl2 Electrophilic addition of bromine, Bry, to alkenes...
2 problems
(Review Topical (References Br н,слен . CH2Cl2 Electrophilic addition of bromine, Bry, to alkenes yields a 1,2 dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH CI In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product Due to stenc clashes, the bromide ion always attacks the carbon...
please be clear in drawings to show where areas are coming from and what theyre pointing...
please be clear in drawings to show where areas are coming from and
what theyre pointing to
[Review Topical [References] Electrophilic addition of bromine, Bry, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH CI, In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due...
CH3 CH3 1. Hg(OAC), H20 2. NaBH НО, І CH3 CH, Hoc H₃C/ Acid-catalyzed addition of...
CH3 CH3 1. Hg(OAC), H20 2. NaBH НО, І CH3 CH, Hoc H₃C/ 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...
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...
(Review Topics 1. Hg(OAC)2, H20 2. NaBH, . H2O OH CHI CH3 H3C H3C Hoc Acid-catalyzed...
(Review Topics 1. Hg(OAC)2, H20 2. NaBH, . H2O OH CHI CH3 H3C H3C Hoc Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov repiochemistry. The electrophilic 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...
Electrophilic addition of bromine, Br2, to alkenes yields a 1,2-dibromoalkane
Electrophilic addition of bromine, Br2, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH2Cl2In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ioa so that a product...
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...
H3 C H2Br Br2, H30* HC X CH3 HzC CH3 H3C CH3 Aldehydes and ketones can...
H3 C H2Br Br2, H30* HC X CH3 HzC CH3 H3C CH3 Aldehydes and ketones can be halogenated at their a-position by reaction with Cl, Br, or 12, under acidic conditions. Using Br2 under acidic conditions, an intermediate enol is formed which adds bromine at the a-position. The reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less favorable. Not started curved arrows to show the movement...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The decomposes to release triphenylphosphine oxide and an alkene. The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an Sy2 react base, such as butyllithium. The carbonyl carbon and the carbon originally bonded...
2 problems
(Review Topical (References Br н,слен . CH2Cl2 Electrophilic addition of bromine, Bry, to alkenes yields a 1,2 dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH CI In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product Due to stenc clashes, the bromide ion always attacks the carbon...
please be clear in drawings to show where areas are coming from and
what theyre pointing to
[Review Topical [References] Electrophilic addition of bromine, Bry, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH CI, In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due...
CH3 CH3 1. Hg(OAC), H20 2. NaBH НО, І CH3 CH, Hoc H₃C/ 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...
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...
(Review Topics 1. Hg(OAC)2, H20 2. NaBH, . H2O OH CHI CH3 H3C H3C Hoc Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov repiochemistry. The electrophilic 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...
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...
H3 C H2Br Br2, H30* HC X CH3 HzC CH3 H3C CH3 Aldehydes and ketones can be halogenated at their a-position by reaction with Cl, Br, or 12, under acidic conditions. Using Br2 under acidic conditions, an intermediate enol is formed which adds bromine at the a-position. The reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less favorable. Not started curved arrows to show the movement...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The decomposes to release triphenylphosphine oxide and an alkene. The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an Sy2 react base, such as butyllithium. The carbonyl carbon and the carbon originally bonded...
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