NH2 (CH2)4 H (CH2)4 H (CH,)4 H CH3 NH, NH, HC(CH3)2 H CH2 amino H>N—C-С-N-С-С—N—С-С—N—С-С-N—С—СООН Terminal Terminal + carboxyl group group но но но H Lysine Lysine Lysine Alanine Leucine 22. The above is the structure of a pentapeptide? a. Basic b. Acidic C. Neutral
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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NH2
NH,
(CH)4 H (СH)4 Н (СH), н СH,
HC(CH3)2
H CH2
Terminal
Terminal
amino → H,N-C-C-N-Ç-C-N-C-C-N-C-C-N-C-COOH
+ carboxyl
group
но
но
но
H
group
Lysine
Lysine
Lysine
Alanine
Leucine
22. The above is the structure of a
pentapeptide?
a.
Basic
b. Acidic
С.
Neutral"
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