In chemical called liqor to those organic chemical compounds containing a hydroxyl group (-OH) in replacing a hydrogen atom covalently bonded to a carbon atom. Besides this carbon must be saturated, ie must have only single bonds to two separate atoms, one that differentiates liqor-phenols. If containing several hydroxyl groups are called polyols (alcohol assessment).
The liqors may be primary, secondary or tertiary, depending on the number of hydrogen atoms substituted on the carbon atom to which they are bound to hydroxyl group. The liqor comes from the Arabic wordof al (determinant) and kuhul meaning 'subtle'. This is because formerly called "spirit" to liqors. For example, "spirits" to ethanol, and "wood spirit" to methanol.
On the other hand, oxygen has two unshared pairs of electrons so that the hydroxyl could be protonated, although in practice this leads to a very weak base, so that for this process to occur, it is necessary to deal with an acid to liqor very strong. For chlorinated or brominated liqors, should take into account the following considerations. Primary liqor: primary liqors react very slowly. As can not form carbocations, activated primary liqor remains in solution until it is attacked by chloride ion. With a primary liqor, the reaction can take thirty minutes to several days. Secondary liqor: secondary liqors take less time, between 5 and 20 minutes, because side carbocations are less stable than tertiary.
Tertiary liqor: tertiary liqors react almost instantaneously, because they are relatively stable tertiary carbocations. Tertiary liqors react directly with hydrochloric acid to produce the tertiary chloroalkane, but a primary or secondary liqor is used the presence of a Lewis acid is required, a "trigger" as zinc chloride.
If it is not the main function, add the prefix hydroxy- preceded by the carbon atom number where the group is attached. For the conjugate base of liqor, liqorate ion, just replace the terminal vowel "e" by -olate suffix (not to be confused with the suffix -oate characteristic of carboxylate, conjugate base the carboxylic acid).
Phenols, are sometimes referred to as individual liqors in which hydroxyl is bonded to a carbon of a benzene ring. Their reactivity is so different from that of other liqors (here the carbon bearing the OH group is not tetrahedral), phenols are generally classified outside the liqor family.
There is also a group sometimes regarded as a special case of liqors called enols. This is a molecule in which hydroxyl is attached to a carbon of a double bond C equals C (again carbon bearing the -OH group is not tetrahedral). This is actually a tautomeric form of an aldehyde or ketone. The major form is usually the aldehyde or ketone, and not the enol, except in special cases where the enol form is stabilized by mesomerism as phenols.
The fact that the hydroxyl group can also form hydrogen bonds affects the melting and boiling points of liqors. Although the hydrogen bond formed is very weak compared to other types of bonds are formed in large numbers between molecules, forming a collective network which hinders the molecules can escape the state in which they are (solid or liquid), thus increasing their melting and boiling points compared to corresponding alkanes. Furthermore, two points are usually far apart, so are often used as components of antifreeze mixtures. For example, 1,2-ethanediol has a melting point of -16 degrees C and a boiling point of 197 degrees C.
The liqors may be primary, secondary or tertiary, depending on the number of hydrogen atoms substituted on the carbon atom to which they are bound to hydroxyl group. The liqor comes from the Arabic wordof al (determinant) and kuhul meaning 'subtle'. This is because formerly called "spirit" to liqors. For example, "spirits" to ethanol, and "wood spirit" to methanol.
On the other hand, oxygen has two unshared pairs of electrons so that the hydroxyl could be protonated, although in practice this leads to a very weak base, so that for this process to occur, it is necessary to deal with an acid to liqor very strong. For chlorinated or brominated liqors, should take into account the following considerations. Primary liqor: primary liqors react very slowly. As can not form carbocations, activated primary liqor remains in solution until it is attacked by chloride ion. With a primary liqor, the reaction can take thirty minutes to several days. Secondary liqor: secondary liqors take less time, between 5 and 20 minutes, because side carbocations are less stable than tertiary.
Tertiary liqor: tertiary liqors react almost instantaneously, because they are relatively stable tertiary carbocations. Tertiary liqors react directly with hydrochloric acid to produce the tertiary chloroalkane, but a primary or secondary liqor is used the presence of a Lewis acid is required, a "trigger" as zinc chloride.
If it is not the main function, add the prefix hydroxy- preceded by the carbon atom number where the group is attached. For the conjugate base of liqor, liqorate ion, just replace the terminal vowel "e" by -olate suffix (not to be confused with the suffix -oate characteristic of carboxylate, conjugate base the carboxylic acid).
Phenols, are sometimes referred to as individual liqors in which hydroxyl is bonded to a carbon of a benzene ring. Their reactivity is so different from that of other liqors (here the carbon bearing the OH group is not tetrahedral), phenols are generally classified outside the liqor family.
There is also a group sometimes regarded as a special case of liqors called enols. This is a molecule in which hydroxyl is attached to a carbon of a double bond C equals C (again carbon bearing the -OH group is not tetrahedral). This is actually a tautomeric form of an aldehyde or ketone. The major form is usually the aldehyde or ketone, and not the enol, except in special cases where the enol form is stabilized by mesomerism as phenols.
The fact that the hydroxyl group can also form hydrogen bonds affects the melting and boiling points of liqors. Although the hydrogen bond formed is very weak compared to other types of bonds are formed in large numbers between molecules, forming a collective network which hinders the molecules can escape the state in which they are (solid or liquid), thus increasing their melting and boiling points compared to corresponding alkanes. Furthermore, two points are usually far apart, so are often used as components of antifreeze mixtures. For example, 1,2-ethanediol has a melting point of -16 degrees C and a boiling point of 197 degrees C.
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