37. Pseudo-pericyclic reactions are reactions that appear at first glance to be pericyclic, in that arrow pushing shows a cyclic array of electrons at the transition state. Several of the other facets of pericyclic reactions are also commonly evident, such as low barriers if the geometries are favorable. However, these reactions are never forbidden based upon a symmetry argument. Examples of such reactions are given below. Write the proper arrow pushing for these reactions, and identity the one facet of these reactions that does not properly conform to standard pericyclic reactions, thereby making them "pseudo-pericyclic". (Hint: In your arrow pushing, it is important to identify the correct source of each arrow.) OH [3,5] her [3.3] ING OH
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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