2.7. Predict the stereochemical outcome of the following reactions: CH3. CH3 a. b. epoxidation CH2 NaBH4 С. d. CH3 catalytic hydrogenation LIAIH4 е. f. CH3- CH3 NMNO epoxidation g. LIAIH4 CH3

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A: About the Harunmadagascarin C, the statement are: 1) Harunmadagascarin C is achiral and does not…

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A:

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Q: What type of sigmatropic rearrangement is illustrated in each equation? a. b. D

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Q: What type of sigmatropic rearrangement is illustrated in each equation?

A: It is the [1,3]-D-shift reaction which is shown below.

Q: In some nucleophilic substitutions under SN1 conditions, complete racemization does not occur and a…

A: a)

Q: How can X be prepared from a constitutional isomer by a series of [2 + 2] cycloaddition reactions?…

A: Given: X is prepared from a constitutional isomer by a series of [2+2] cycloaddition reactions.

Q: In some nucleophilic substitutions under SN1 conditions, completeracemization does not occur and a…

A: (a)

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A:

Q: What type of sigmatropic rearrangement is illustrated in each equation?

A: The first rearrangement is an example of sigmatropic [1,3] rearrangement. In this rearrangement, the…

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A: The trisubstituted conformer contains three substituents on the cyclohexane ring.

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A: The products obtained by Markovnikov addition are: Since both of these have (R,R) and (S,S)…

Q: a) b) c)

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Q: The bicyclic heterocycles quinoline and indole undergo electrophilic aromatic substitution to give…

A: (a) Here, the substitution does not occur on the ring which has a nitrogen atom since the lone pair…

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A:

Q: What type of sigmatropic rearrangement is illustrated in each equation?

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Q: (c) Diels-Alder reactions are a highly effective way to synthesise stereospecifically fused cyclic…

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Q: What is the % of H2O if 102g H2) is produced from 14.6g H2 and excess O2?

A: Given  Mass of H2O  = 102 gram Mass of H2    = 14.6 gram  Percentage yield   =?

Q: Q6) (use a Newman or Saw Horse projection) the stereochemical requirements for the E2 elimination…

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A: The statements given are,

Q: Does cis- or trans-1-bromo-4-tert-butylcylohexane react faster in an E2reaction?

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Q: What alkyl halide will be obtained in greatest yield? Ignore stereoisomers.

A:

Q: What is the stereoisomeric composition of a of 2-bromobutanes, with 4-) mixture 50%ee of (+)-2-…

A: There is a mixture of 2-bromobutane. %ee ((+)-2-bromobutane) = 50%

Q: b) Arrange the following compounds according to the reactivity towards nitration. Give reasons for…

A: Given compounds are :

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Q: II III

A: Stability of alkane is depends upon branches and heat of combustion.

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Q: Which heteroatom don't contain heterocyclic compounds? a. Phosphorus b. Oxygen c. Nitrogen d. Sulfur

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Q: The bicyclic heterocycles quinoline and indole undergo electrophilic aromatic substitution to give…

A: (a) Here, the substitution does not occur on the ring which has a nitrogen atom since the lone pair…

Q: Explain the regioselectivity exhibited by the following reaction, .CO.Me .CO2ME 20°, 7 months 54%…

A: It's an [4+2π] electron cycloaddition reaction . Where there is a diene and a dienophile. The diene…

Q: 15. Label the following transition state with the applicable following items (not all labels will…

A: This is an example of basic diels Alder reaction.

Q: In some nucleophilic substitutions under SN1 conditions, complete racemization does not occur and a…

A: (a)

Q: What type of sigmatropic rearrangement is illustrated in each equation ?

A: The type of sigmatropic rearrangements for the given reaction has to be identified.

Q: Name the type of reaction and provide a possible reagent  assign all the stereocentres found in the…

A: Compound C contains two functional groups ; Carbonyl /ketone and ether. Compounds D, E, F and G…

Reactions of Ethers

Ethers (R-O-R’) are compounds formed by replacing hydrogen atoms of an alcohol (R-OH compound) or a phenol (C6H5OH) by an aryl/ acyl group (functional group after removing single hydrogen from an aromatic ring). In this section, reaction, preparation and behavior of ethers are discussed in the context of organic chemistry.

Epoxides

Epoxides are a special class of cyclic ethers which are an important functional group in organic chemistry and generate reactive centers due to their unusual high reactivity. Due to their high reactivity, epoxides are considered to be toxic and mutagenic.

Williamson Ether Synthesis

An organic reaction in which an organohalide and a deprotonated alcohol forms ether is known as Williamson ether synthesis. Alexander Williamson developed the Williamson ether synthesis in 1850. The formation of ether in this synthesis is an SN2 reaction.