Read More
Date: 21-11-2019
1013
Date: 28-7-2018
749
Date: 22-8-2019
919
|
The IUPAC system of nomenclature assigns a characteristic suffix to these classes. The –e ending is removed from the name of the parent chain and is replaced -anoic acid. Since a carboxylic acid group must always lie at the end of a carbon chain, it is always is given the #1 location position in numbering and it is not necessary to include it in the name.
Many carboxylic acids are called by the common names. These names were chosen by chemists to usually describe a source of where the compound is found. In common names of aldehydes, carbon atoms near the carboxyl group are often designated by Greek letters. The atom adjacent to the carbonyl function is alpha, the next removed is beta and so on.
Formula | Common Name | Source | IUPAC Name | Melting Point | Boiling Point |
---|---|---|---|---|---|
HCO2H | formic acid | ants (L. formica) | methanoic acid | 8.4 ºC | 101 ºC |
CH3CO2H | acetic acid | vinegar (L. acetum) | ethanoic acid | 16.6 ºC | 118 ºC |
CH3CH2CO2H | propionic acid | milk (Gk. protus prion) | propanoic acid | -20.8 ºC | 141 ºC |
CH3(CH2)2CO2H | butyric acid | butter (L. butyrum) | butanoic acid | -5.5 ºC | 164 ºC |
CH3(CH2)3CO2H | valeric acid | valerian root | pentanoic acid | -34.5 ºC | 186 ºC |
CH3(CH2)4CO2H | caproic acid | goats (L. caper) | hexanoic acid | -4.0 ºC | 205 ºC |
CH3(CH2)5CO2H | enanthic acid | vines (Gk. oenanthe) | heptanoic acid | -7.5 ºC | 223 ºC |
CH3(CH2)6CO2H | caprylic acid | goats (L. caper) | octanoic acid | 16.3 ºC | 239 ºC |
CH3(CH2)7CO2H | pelargonic acid | pelargonium (an herb) | nonanoic acid | 12.0 ºC | 253 ºC |
CH3(CH2)8CO2H | capric acid | goats (L. caper) | decanoic acid | 31.0 ºC | 219 ºC |
Example (Common Names Are in Red)
|
|
تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
|
|
|
|
|
أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
|
|
|
|
|
قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
|
|
|