4. Sigmatropic Rearrangements For each reaction: symmetry Indicate which I molecular orbital is the HOMO and its Determine if the rearrangement would be suprafacial or Draw an arrow pushing mechanism Draw the structure of the major product Describe the rearrangement e.g. [3,3] antarafacial
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.
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4. Sigmatropic Rearrangements
For each reaction:
symmetry
Indicate which п molecular orbital is the HOMO and its
Determine if the rearrangement would be suprafacial or
antarafacial
Draw an arrow pushing mechanism
Draw the structure of the major product
Describe the rearrangement e.g. [3,3]
type
type
type
type
hv
hy
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