Search results
Results from the WOW.Com Content Network
In organic chemistry, a substituent is one or a group of atoms that replaces (one or more) atoms, thereby becoming a moiety in the resultant (new) molecule. [1] ( In organic chemistry and biochemistry, the terms substituent and functional group, as well as side chain and pendant group, are used almost interchangeably to describe those branches from the parent structure, [2] though certain ...
Haloalkane or alkyl halides are the compounds which have the general formula "RX" where R is an alkyl or substituted alkyl group and X is a halogen (F, Cl, Br, I). Haloalkanes have been known for centuries. Chloroethane was produced in the 15th century. The systematic synthesis of such compounds developed in the 19th century in step with the ...
The carbanion formed can undergo nucleophilic substitution on the alkyl halide, to give the alkylated compound. On heating, the di-ester undergoes thermal decarboxylation, yielding an acetic acid substituted by the appropriate R group. [1] Thus, the malonic ester can be thought of being equivalent to the − CH 2 COOH synthon.
Furthermore, similar to a positive charged species, the radical species is most stable when the unpaired electron is in the more substituted position. The radical intermediate is stabilized by hyperconjugation. In the more substituted position, more carbon-hydrogen bonds are aligned with the radical's electron deficient molecular orbital.
Substituted amphetamines, or simply amphetamines, are a class of compounds based upon the amphetamine structure; [1] it includes all derivative compounds which are formed by replacing, or substituting, one or more hydrogen atoms in the amphetamine core structure with substituents.
[42] [43] Often polysubstance use occurs and barbiturates are consumed with or substituted by other available substances, most commonly alcohol. People who use substances tend to prefer short-acting and intermediate-acting barbiturates. [44] The most commonly used are amobarbital (Amytal), pentobarbital (Nembutal), and secobarbital (Seconal).
"Substitute" is a song by the English rock band the Who, written by Pete Townshend. Released in March 1966, the single reached number five in the UK and was later included on the compilation album Meaty Beaty Big and Bouncy in 1971. [4] In 2006, Pitchfork ranked "Substitute" at number 91 on the "200 Greatest Songs of the 1960s". [5]
Amino acid replacement is a change from one amino acid to a different amino acid in a protein due to point mutation in the corresponding DNA sequence. It is caused by nonsynonymous missense mutation which changes the codon sequence to code other amino acid instead of the original.