Aromatic carboxylic acid ester Other carboxylate Carboxylic acids Aliphatic dicarboxylic acid esters
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Carboxylic acids and esters

Aromatic carboxylic acid ester Other carboxylate Carboxylic acids Aliphatic dicarboxylic acid esters
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Carboxylic acid is also known as "organic acid". It refers to the general term of the organic compound formed through the combination between hydrocarbon group and carboxyl group with the general formula being RCOOH.It is mostly in the form of an ester to be widespread in nature. Based on the hydrocarbon structure, it is divided into: 1 aliphatic carboxylic acid: it is formed through connection between aliphatic hydrocarbon group and carboxyl group, such as acetic acid CH3COOH. 2 aromatic carboxylic acids: it is formed through the connection between aromatic rings with a carboxyl group, such as benzoic acid C6H5-COOH. 3 cyclic acid; it is formed through the connection between carboxyl group and cyclic hydrocarbon group such as cyclohexane carboxylic acid. 4 saturated carboxylic acids: it refers to saturated hydrocarbon-containing acids, such as butyric acid CH3CH2CH2COOH. 5 unsaturated carboxylic: acids; it refers to acid containing an unsaturated hydrocarbon group such as acrylic acid CH2 = CHCOOH.

Based on the number of carboxyl groups contained in the molecules, it can be divided into monobasic acid, dibasic acids and poly-acids. Those which have substituents groups contained inside the hydrocarbon are called as "substituted carboxylic acid." Saturated mono-carboxylic acids containing one to nine carbon atoms inside the molecule appear as liquid while those containing more than ten carbon atoms appear as solid while aromatic carboxylic acids and saturated dicarboxylic acids both appear as solid. Carboxylic acids have weak acidicity, and have been largely applied to the manufacturing of esters, acyl chlorides, amides and anhydrides, with reduction of the carboxylic acid yielding the corresponding alcohol. A large number of carboxylic acids have widely applied to dyes, rubber, pharmaceuticals, perfumes, cosmetics, light industry and other industries.

Esters spices refer to the ester compound synthesized through the reaction between alcohols and carboxylic acids. It is a very important large class in spice. Depending on the raw materials used in the synthesis, it can be roughly divided into: aliphatic carboxylates, aromatic carboxylate ester, alkene & alkyne unsaturated bond-containing carboxylic acid ester, and other esters.

The main features of ester series spices are: carboxylic ester can be taken as the product of the substitution of the hydroxy group in acid with alkoxy group. Because the hydroxyl group contained in a carboxyl group may be substituted with one or more alkoxy groups, thus leading to the synthesis of monoester, diester or polyesters. Furthermore, there may also be several hydroxy groups contained in the alcohols, and therefore its alkoxy groups can be connected with one or more carboxyl groups to yield mono- or carboxylate. The aroma, fragrance type, fragrance intensity and features are all related to the structure of the esters. The esters formed through low-grade carboxylic acid and low grade alcohol generally appear as volatile liquid with aroma of flowers, fruit and grass. The ester formed between low grade carboxylic acid and low grade terpene has flower aroma. Esters containing aromatic groups mostly have flower aroma. Esters results from aromatic acids and aromatic alcohols, although with not very strong aroma, has relative higher boiling points and long-lasting aroma. Esters spices are widely distributed in nature with existence in plant roots, stems, leaves, fruits, seeds, bark, flowers and other parts as well as in the secretion products of some animals. There are even more kinds of artificially synthetic ester spices. Because of the easy process of synthesis of esters and the wide source of raw materials, there are many fragrance types for the synthetic esters; the price is also low, and therefore they have achieved widely applications.

Fatty acid esters spices occupy an important status in the fragrance industry, which is characterized by variety, easy synthesis and low prices, and it has been widely used in daily flavor, food flavor as well as industrial flavor. The mainly preparation methods include the esterification reaction between alcohol and fatty acid, the reaction between alcohol and acid anhydride, the reaction between acyl chloride and alcohol, interchange reaction of ester and the reaction between carboxylic acid salt and alkyl halide.

The aromatic esters spices mainly include benzoate, phenylacetic acid ester, cinnamic acid ester and salicylic acid esters. Methods of synthesizing mainly include esterification between alcohol and aromatic acids, reaction between alcohol and benzoyl chloride, ester exchange reaction as well as the reaction between alkyl halide and aromatic acid salt. They play an important role in the daily flavors and edible flavors.

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Structure:
Chemical Name:
2,3,6-Trimethylphenol
CAS:
2416-94-6
MF:
C9H12O
Structure:
Chemical Name:
trans-2-Hexenoic acid
CAS:
13419-69-7
MF:
C6H10O2
Structure:
Chemical Name:
Cinnamaldehyde
CAS:
104-55-2
MF:
C9H8O
Structure:
Chemical Name:
Benzaldehyde propylene glycol acetal
CAS:
2568-25-4
MF:
C10H12O2
Structure:
Chemical Name:
PROPYL BENZOATE
CAS:
2315-68-6
MF:
C10H12O2
Structure:
Chemical Name:
Dimethyl adipate
CAS:
627-93-0
MF:
C8H14O4
Structure:
Chemical Name:
4-Methylvaleric acid
CAS:
646-07-1
MF:
C6H12O2
Structure:
Chemical Name:
alpha-Methylcinnamaldehyde
CAS:
101-39-3
MF:
C10H10O
Structure:
Chemical Name:
Ethyl butyrylacetate
CAS:
3249-68-1
MF:
C8H14O3
Structure:
Chemical Name:
4-Ethylphenol
CAS:
123-07-9
MF:
C8H10O
Structure:
Chemical Name:
DL-3-Methylvaleric acid
CAS:
105-43-1
MF:
C6H12O2
Structure:
Chemical Name:
4-Hexanolide
CAS:
695-06-7
MF:
C6H10O2
Structure:
Chemical Name:
Ethyl benzoylacetate
CAS:
94-02-0
MF:
C11H12O3
Structure:
Chemical Name:
alpha-Angelica lactone
CAS:
591-12-8
MF:
C5H6O2
Structure:
Chemical Name:
3-Methoxybenzoic acid
CAS:
586-38-9
MF:
C8H8O3
Structure:
Chemical Name:
2',4'-Dimethylacetophenone
CAS:
89-74-7
MF:
C10H12O
Structure:
Chemical Name:
METHYL MYRISTATE
CAS:
124-10-7
MF:
C15H30O2
Structure:
Chemical Name:
ETHYL (METHYLTHIO)ACETATE
CAS:
4455-13-4
MF:
C5H10O2S
Structure:
Chemical Name:
Isobutyric acid
CAS:
79-31-2
MF:
C4H8O2
Structure:
Chemical Name:
2-Methyl-2-pentenoic acid
CAS:
3142-72-1
MF:
C6H10O2
Structure:
Chemical Name:
Octyl 4-methoxycinnamate
CAS:
5466-77-3
MF:
C18H26O3
Structure:
Chemical Name:
4-Methyloctanoic acid
CAS:
54947-74-9
MF:
C9H18O2
Structure:
Chemical Name:
gamma-Valerolactone
CAS:
108-29-2
MF:
C5H8O2
Structure:
Chemical Name:
Diethyl 2,4-dimethylpyrrole-3,5-dicarboxylate
CAS:
2436-79-5
MF:
C12H17NO4
Structure:
Chemical Name:
gamma-Octanoic lactone
CAS:
104-50-7
MF:
C8H14O2
Structure:
Chemical Name:
Ethyl 3-phenylpropionate
CAS:
2021-28-5
MF:
C11H14O2
Structure:
Chemical Name:
2',5'-Dimethoxyacetophenone
CAS:
1201-38-3
MF:
C10H12O3
Structure:
Chemical Name:
Ethyl crotonate
CAS:
623-70-1
MF:
C6H10O2
Structure:
Chemical Name:
Pyruvic acid
CAS:
127-17-3
MF:
C3H4O3
Structure:
Chemical Name:
Tributyrin
CAS:
60-01-5
MF:
C15H26O6
Structure:
Chemical Name:
Butyl hexanoate
CAS:
626-82-4
MF:
C10H20O2
Structure:
Chemical Name:
4,5-Dimethyl-3-hydroxy-2,5-dihydrofuran-2-one
CAS:
28664-35-9
MF:
C6H8O3
Structure:
Chemical Name:
(1R)-(-)-Menthyl acetate
CAS:
2623-23-6
MF:
C12H22O2
Structure:
Chemical Name:
delta-Dodecalactone
CAS:
713-95-1
MF:
C12H22O2
Structure:
Chemical Name:
Ethyl L(-)-lactate
CAS:
687-47-8
MF:
C5H10O3
Structure:
Chemical Name:
Benzyl cinnamate
CAS:
103-41-3
MF:
C16H14O2
Structure:
Chemical Name:
4-Ethyl-2-methoxyphenol
CAS:
2785-89-9
MF:
C9H12O2
Structure:
Chemical Name:
gamma-Nonanolactone
CAS:
104-61-0
MF:
C9H16O2
Structure:
Chemical Name:
Ethyl levulinate
CAS:
539-88-8
MF:
C7H12O3
Structure:
Chemical Name:
2-Ethylbutyric acid
CAS:
88-09-5
MF:
C6H12O2
Structure:
Chemical Name:
4-Heptanolide
CAS:
105-21-5
MF:
C7H12O2
Structure:
Chemical Name:
Methyl salicylate
CAS:
119-36-8
MF:
C8H8O3
Structure:
Chemical Name:
Dibutyl sebacate
CAS:
109-43-3
MF:
C18H34O4
Structure:
Chemical Name:
Allyl isothiocyanate
CAS:
57-06-7
MF:
C4H5NS
Structure:
Chemical Name:
Butyl formate
CAS:
592-84-7
MF:
C5H10O2
Structure:
Chemical Name:
2-Ethoxynaphthalene
CAS:
93-18-5
MF:
C12H12O
Structure:
Chemical Name:
Dimethyl succinate
CAS:
106-65-0
MF:
C6H10O4
Structure:
Chemical Name:
Isobutyl acetoacetate
CAS:
7779-75-1
MF:
C8H14O3
Structure:
Chemical Name:
ETHYL STEARATE
CAS:
111-61-5
MF:
C20H40O2
Structure:
Chemical Name:
2-Methoxy-4-methylphenol
CAS:
93-51-6
MF:
C8H10O2
Structure:
Chemical Name:
Undecanolactone
CAS:
710-04-3
MF:
C11H20O2
Structure:
Chemical Name:
Isopropenyl acetate
CAS:
108-22-5
MF:
C5H8O2
Structure:
Chemical Name:
Diethyl succinate
CAS:
123-25-1
MF:
C8H14O4
Structure:
Chemical Name:
Palmitic acid ethyl ester
CAS:
628-97-7
MF:
C18H36O2
Structure:
Chemical Name:
1-Octen-3-yl acetate
CAS:
2442-10-6
MF:
C10H18O2
Structure:
Chemical Name:
Isobutyl salicylate
CAS:
87-19-4
MF:
C11H14O3
Structure:
Chemical Name:
Methyl propionate
CAS:
554-12-1
MF:
C4H8O2
Structure:
Chemical Name:
NERYL ACETATE
CAS:
141-12-8
MF:
C12H20O2
Structure:
Chemical Name:
ALLYL CINNAMATE
CAS:
1866-31-5
MF:
C12H12O2
Structure:
Chemical Name:
Propyl cinnamate
CAS:
7778-83-8
MF:
C12H14O2
Structure:
Chemical Name:
Styralyl acetate
CAS:
93-92-5
MF:
C10H12O2
Structure:
Chemical Name:
Benzyl acetate
CAS:
140-11-4
MF:
C9H10O2
Structure:
Chemical Name:
Butyl butyrate
CAS:
109-21-7
MF:
C8H16O2
Structure:
Chemical Name:
5-Hydroxyoctanoic acid lactone
CAS:
698-76-0
MF:
C8H14O2
Structure:
Chemical Name:
Ethyl caprate
CAS:
110-38-3
MF:
C12H24O2
Structure:
Chemical Name:
TETRAHYDROFURFURYL ACETATE
CAS:
637-64-9
MF:
C7H12O3
Structure:
Chemical Name:
Ethanethioic acid S-ethyl ester
CAS:
625-60-5
MF:
C4H8OS
Structure:
Chemical Name:
OCTYL BUTYRATE
CAS:
110-39-4
MF:
C12H24O2
Structure:
Chemical Name:
ISOAMYL HEXANOATE
CAS:
2198-61-0
MF:
C11H22O2
Structure:
Chemical Name:
2-METHYLVALERIC ACID
CAS:
97-61-0
MF:
C6H12O2
Structure:
Chemical Name:
Isoamyl o-hydroxybenzoate
CAS:
87-20-7
MF:
C12H16O3
Structure:
Chemical Name:
AMYL BUTYRATE
CAS:
540-18-1
MF:
C9H18O2
Structure:
Chemical Name:
(+)-Isobutyl D-lactate
CAS:
61597-96-4
MF:
C7H14O3
Structure:
Chemical Name:
Cinnamyl propionate
CAS:
103-56-0
MF:
C12H14O2
Structure:
Chemical Name:
Hexyl benzoate
CAS:
6789-88-4
MF:
C13H18O2
Structure:
Chemical Name:
Diethyl malonate
CAS:
105-53-3
MF:
C7H12O4
Structure:
Chemical Name:
Isobutyl acetate
CAS:
110-19-0
MF:
C6H12O2
Structure:
Chemical Name:
Ethyl valerate
CAS:
539-82-2
MF:
C7H14O2
Structure:
Chemical Name:
Ethyl isobutyrate
CAS:
97-62-1
MF:
C6H12O2
Structure:
Chemical Name:
Propyl acetate
CAS:
109-60-4
MF:
C5H10O2
Structure:
Chemical Name:
Ethyl 3-mercaptopropionate
CAS:
5466-06-8
MF:
C5H10O2S
Structure:
Chemical Name:
Methyl acetate
CAS:
79-20-9
MF:
C3H6O2
Structure:
Chemical Name:
Butyl propionate
CAS:
590-01-2
MF:
C7H14O2
Structure:
Chemical Name:
Ethyl cinnamate
CAS:
103-36-6
MF:
C11H12O2
Structure:
Chemical Name:
NONYL ACETATE
CAS:
143-13-5
MF:
C11H22O2
Structure:
Chemical Name:
Furfuryl thiopropionate
CAS:
59020-85-8
MF:
C8H10O2S
Structure:
Chemical Name:
4-Ethyloctanoic acid
CAS:
16493-80-4
MF:
C10H20O2
Structure:
Chemical Name:
Ethyl benzoate
CAS:
93-89-0
MF:
C9H10O2
Structure:
Chemical Name:
Cinnamyl chloride
CAS:
2687-12-9
MF:
C9H9Cl
Structure:
Chemical Name:
Butyl benzoate
CAS:
136-60-7
MF:
C11H14O2
Structure:
Chemical Name:
Methyl dihydrojasmonate
CAS:
24851-98-7
MF:
C13H22O3
Structure:
Chemical Name:
CYCLOHEXYL BUTYRATE
CAS:
1551-44-6
MF:
C10H18O2
Structure:
Chemical Name:
Isobutyl 3,5-diamino-4-chloro benzoate
CAS:
32961-44-7
MF:
C11H15ClN2O2
Structure:
Chemical Name:
Isoamyl propionate
CAS:
105-68-0
MF:
C8H16O2
Structure:
Chemical Name:
Maltol isobutyrate
CAS:
65416-14-0
MF:
C10H12O4
Structure:
Chemical Name:
Ethyl isovalerate
CAS:
108-64-5
MF:
C7H14O2
Structure:
Chemical Name:
Phenoxyethyl isobutyrate
CAS:
103-60-6
MF:
C12H16O3
Structure:
Chemical Name:
CIS-3-HEXENYL ISOBUTYRATE
CAS:
41519-23-7
MF:
C10H18O2
Structure:
Chemical Name:
Isobutyl hexanoate
CAS:
105-79-3
MF:
C10H20O2
Structure:
Chemical Name:
Methyl isovalerate
CAS:
556-24-1
MF:
C6H12O2