621-82-9 Usage
Chemical Properties
Different sources of media describe the Chemical Properties of 621-82-9 differently. You can refer to the following data:
1. Cinnamic acid exists in cis and trans forms. the more stable isomer is the trans isomer, which occurs naturally and is the usual commercial product. It appears as white monoclinic prisms with slight cinnamon aroma. It is soluble in ethanol, methanol, petroleum ether and chloroform; it is easily soluble in benzene, ether, acetone, acetic acid, carbon disulfide and oils but insoluble in water.
Cinnamic acid was first isolated as crystals from cinnamon oil by Trommsdorf in 1780. He thought it was benzoic acid. Dumas and Peligot ′ identified it in 1835, and in 1856 Bertagnini succeeded in synthesizing it from benzaldehyde and acetyl chloride.
Cinnamic acid undergoes reactions typical of a carboxyl group and an olefinic double bond. The carboxyl group can be esterified to form cinnamates, some of which are important flavorings and fragrances. When reacted with inorganic acid chlorides, such as thionyl chloride or phosphorus chlorides, cinnamic acid gives cinnamoyl chloride [102-92-1]. When heated, cinnamic acid forms styrene [100-42-5] and carbon dioxide. With oxidizing agents or when heated with alkali, the olefinic double bond cleaves to give benzaldehyde [98-87-3].
2. Cinnamic acid is almost odorless with a burning taste, and then turning sweet and reminiscent of apricot.
Physical and Chemical Properties
Cinnamic acid, also known benzal acetate, 3-phenyl-2-propenoic acid, belongs to a kind of unsaturated aromatic acid with a slight smell of cinnamon. It is presented in balsam, cinnamon oil and coca leaf in the form of free or ester form. Owing to the presence of a double bond, cinnamic acid has trans-/ cis-two isomers with the cis form containing an extra three kinds of homogeneous polycrystalline. Both trans-form and cis-form are in the presence of nature. The trans-form exists in the presence of essential oils including storax, cinnamon oil, Peruvian balsam, basil oil and cocoa leaves. The cis-form exists in Malacca galangal oil with the trans-form being more stable than the cis-form. The commercially available products are mostly in the form of trans. It has a relative molecular mass of 148.17. The first crystalline form of the cis form is called allocinnamic acid with the compound precipitated from water being monoclinic. It is colorless to white prismatic crystals with the relative density being 1.284 (4 ℃), the melting point being 42 ℃, the boiling point 265 ℃ (decomposition ) and 125 ℃ (2.533 × 103Pa); it is slightly soluble in water (25 ℃ when 0.937) but easily soluble in alcohol, ether and ethyl acetate.
The second polymorph is called alpha-iso-cinnamic acid with the compound precipitated from ligroin being the monoclinic crystal. It is colorless to white prismatic crystals with the mp being 58 ℃ and the boiling point being 265 ℃. It is soluble in ethanol, acetic acid, chloroform and acetone and easily soluble in ether. The third polymorph is called beta-iso-cinnamic acid; it appears as monoclinic colorless to white prismatic crystals with the mp being 68 ℃. It is soluble in alcohol, ether, acetic acid, chloroform and acetone. Trans-isomer precipitated from dilute ethanol belongs to the monoclinic crystal and appears as white to pale yellow prismatic crystals with the relative density being 1.2475 (4 ℃), melting point being 133 ℃ and the boiling point being 300 ℃. It is very slightly soluble in water (25 ℃: 0.1; 98 ℃: 0.588), soluble in ethanol (25 ℃: 23), chloroform (15 ℃: 5.9), easily soluble in benzene, ether, acetone, acetic acid and carbon disulfide. When being distilled at 140 ℃, it undergoes decarboxylation to become styrene (Styrax BP). Upon oxidation, it generates benzoic acid. Both the cis-and trans-isomers have flower honey aroma with sweet and spicy flavor. Rat-Oral LD50: 2500 mg/kg.
Role and purpose
Cinnamic acid is an important kind of organic synthetic raw material. It is mainly used for the synthesis of methyl cinnamate, ethyl cinnamate and cinnamic acid benzyl ester. It is widely used in the perfume industry and the pharmaceutical industry. In medicine, it has been ever used as an insect repellent.
Cinnamic acid was used as spices for the preparation of cherry, apricot, honey and cinnamon aromas and flavors; it can also be used as the starting material of cinnamic acid ester. The GB2760-1996 of our country provided that cinnamic acid is allowable edible spices; in addition, it can also be used as the raw material of photosensitive resin poly vinyl cinnamic acid series; it can also be used as the raw material for the synthesis of methyl, ethyl and benzyl esters. These esters, being used as fragrances, can be applied to cosmetics and soap, it can also be used as a local anesthetic, hemostatic agents and pharmaceuticals (lactic acid Prenylamine and baclofen, etc.) raw materials; cinnamic acid may also be used as plant growth regulators and raw materials of pesticides; anti-corrosion agents of fruit and vegetables; raw material of ultraviolet agent and photosensitive resin for cosmetic sunscreen. Cinnamic acid may also be used as the standard for organic trace analysis and determination of double bond, determination of uranium and vanadium and thorium separation.
Uses
Different sources of media describe the Uses of 621-82-9 differently. You can refer to the following data:
1. Cinnamic acid is an important intermediate in the preparation of its esters, which are used as fragrances, for pharmaceuticals, and for the enzymatic production of l-phenylalanine, the starting material for peptide sweeteners. Sodium cinnamate is a known corrosion inhibitor. Cinnamic acid is also used as a brightener in cyanide-free zinc electroplating baths, a corrosion inhibitor during removal of scale from zinc and in aerosol cans, a low-toxicity heat stabilizer for poly(vinyl chloride) , a cross-linking agent for dimethyl terephthalate – ethylene glycol copolymer and polyurethanes, a fireproofing agent for polycaprolactam, in laundry-resistant polyurethane adhesives for polyester fibers, and for improvement of the storage stability of drying-oil-modified alkyd resin coatings.
2. fragrance & flavoring agent, antidiabetic
3. cinnamic acid has sunscreen capabilities. Some manufacturers use it to replace PABA because of its lower allergic and phototoxic reaction incidence. Cinnamic acid is found in cinnamon leaves and cocoa leaves, and is an essential oil of certain mushrooms. It may cause allergic skin rashes.
4. Cinnamic Acid is a flavoring agent that consists of crystalline scales,
white in color, with an odor resembling honey and flowers. it is
slightly soluble in water, soluble in alcohol, chloroform, acetic acid,
acetone, benzene, and most oils, and alkali salts soluble in water.
it is obtained by chemical synthesis. it is also termed 3-phenylpro-
penoic acid.
Preparation
Different sources of media describe the Preparation of 621-82-9 differently. You can refer to the following data:
1. Cinnamic acid is also produced by Knoevenagel condensation of benzaldehyde with malonic acid in the presence of weakly basic catalysts, such as ammonia and amines.
Reflux together 10ml of benzaldehyde with 10gm of malonic acid and 40ml of 8% ethanolic ammonia solution placed in a 100ml round bottom flask fitted with a reflux condensor on water bath till a clear solution is obtained (about 8-10hours). Set the assembly for downward distillation and distill off the excess alcohol. Continue heating the residual oily portion until the evolution of carbon dioxide ceases. Dissolve the residue in 20ml water, cool and add dilute hydrochloric acid till acidic. Collect the precipitated unsaturated acid on buchner funnel，wash with cold water. Recrystallise from hot water and collect crystals of cinnamic acid, m.p 132°C.
Synthesis of cinnamic acid from benzaldehyde
2. Two isomers, trans- and cis- exist; the trans-isomer is of interest for use in flavoring; in addition to the extraction from
natural sources (storax), it can be prepared as follows: (1) from benzaldehyde, anhydrous sodium acetate and acetic anhydride in the
presence of pyridine (Perkin reaction); (2) from benzaldehyde and ethyl acetate (Claisen condensation); (3) from benzaldehyde and
acetylene chloride; (4) by oxidation of benzylidene acetone with sodium hypochlorite.
Content Analysis
Accurately weigh 500 mg of sample which have been previously dried for 3 hours in drier filled with silica gel; add 0.1mol/L hydrogen.
Toxicity
GRAS (FEMA).
The acute oral LD50 in rats is 2.5 g/kg, and the acute dermal LD50 in rabbits exceeds 5 g/kg. Cinnamic acid applied neat to intact or abraded rabbit skin for 24 h was slightly irritating;a4% solution in petrolatum produced no sensitization in man.
Limited use
FEMA (mg/kg): Soft drinks 31; Cold drink 40; Confectionery 30; Bakery 36; Gum 10.
Take moderate as the limit (FDA§172.515, 2000).
Production method
Commercial synthesis of cinnamic acid almost always results in the trans isomer.
The Perkin reaction is the oldest known method of producing cinnamic acid commercially. In this reaction benzaldehyde [100-52-7] is condensed with acetic anhydride in the presence of sodium acetate as catalyst.
Benzal chloride reacts with alkali acetate in an alkaline medium to give a high yield of cinnamic acid. Cinnamic acid can be obtained by this reaction in the presence of amines such as pyridine in more than 80 % yield.
It can also be prepared through: mixing the benzoylacetone, sodium carbonate and bleach, generating sodium cinnamic acid, followed by processing with sulfate.
Description
Cinnamic acid is a white crystalline organic acid, which is slightly soluble in water. It is obtained from oil of cinnamon, or from balsams such as storax. It is also found in shea butter and is the best indication of its environmental history and post-extraction conditions. It can also be made synthetically. Cinnamic acid is used in flavors, synthetic indigo, and certain pharmaceuticals, though its primary use is in the manufacturing of the methyl, ethyl, and benzyl esters for the perfume industry. Cinnamic acid has a honey- like odor; it and its more volatile ethyl ester (ethyl cinnamate) are flavor components in the essential oil of cinnamon, in which related cinnamaldehyde is the major constituent. Cinnamic acid is also part of the biosynthetic shikimate and phenyl propanoid pathways. Its biosynthesis is performed by action of the enzyme phenylalanine ammonia - lyase (PAL) on phenylalanine. Cinnamic acid is freely soluble in benzene, diethyl ether, acetone, and it is insoluble in hexane. Cinnamic acid is also a kind of self-inhibitor produced by fungal spore to prevent germination.
Occurrence
The trans- form has been found among the constituents of the essential oils of basil, Chinese cinnamon,
Melaleuca bracteata, Alpinia galanga. It is reported found in Peru balsam, Asian and American storax and cocoa leaves. Also
reported found in strawberry fruit, beer, cognac, starfruit (Averrhoa carambola L) and loquat. The cis- form is present in the oil of
Alpinia malacensis.
Definition
ChEBI: A monocarboxylic acid that consists of acrylic acid bearing a phenyl substituent at the 3-position. It is found in Cinnamomum cassia.
Synthesis Reference(s)
Journal of the American Chemical Society, 75, p. 1068, 1953 DOI: 10.1021/ja01101a016The Journal of Organic Chemistry, 59, p. 710, 1994 DOI: 10.1021/jo00083a006
Safety Profile
Poison by intravenous
and intraperitoneal routes. Moderately toxic
by ingestion. A skin irritant. Combustible
liquid. When heated to decomposition it
emits acrid smoke and fumes.
Synthesis
Rainer Ludwig Claisen (1851–1930), German chemist, described for the first time in 1890 the synthesis of cinnamates by reacting aromatic aldehydes with esters. The reaction is known as the Claisen condensation.
Check Digit Verification of cas no
The CAS Registry Mumber 621-82-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,2 and 1 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 621-82:
(5*6)+(4*2)+(3*1)+(2*8)+(1*2)=59
59 % 10 = 9
So 621-82-9 is a valid CAS Registry Number.
InChI:InChI=1/C9H8O2/c10-9(11)7-6-8-4-2-1-3-5-8/h1-7H,(H,10,11)/b7-6-
621-82-9Relevant articles and documents
Spatially orthogonal chemical functionalization of a hierarchical pore network for catalytic cascade reactions
Parlett, Christopher M.A.,Isaacs, Mark A.,Beaumont, Simon K.,Bingham, Laura M.,Hondow, Nicole S.,Wilson, Karen,Lee, Adam F.
, p. 178 - 182 (2016)
The chemical functionality within porous architectures dictates their performance as heterogeneous catalysts; however, synthetic routes to control the spatial distribution of individual functions within porous solids are limited. Here we report the fabrication of spatially orthogonal bifunctional porous catalysts, through the stepwise template removal and chemical functionalization of an interconnected silica framework. Selective removal of polystyrene nanosphere templates from a lyotropic liquid crystal-templated silica sol-gel matrix, followed by extraction of the liquid crystal template, affords a hierarchical macroporous-mesoporous architecture. Decoupling of the individual template extractions allows independent functionalization of macropore and mesopore networks on the basis of chemical and/or size specificity. Spatial compartmentalization of, and directed molecular transport between, chemical functionalities affords control over the reaction sequence in catalytic cascades; herein illustrated by the Pd/Pt-catalysed oxidation of cinnamyl alcohol to cinnamic acid. We anticipate that our methodology will prompt further design of multifunctional materials comprising spatially compartmentalized functions.
Synthesis and characterization of two new molten acid salts: Safe and greener alternatives to sulfuric acid for the hydrolytic conversion of 1,1,1,3-tetrachloro-3-phenylpropane to cinnamic acid
Gorjian, Hayedeh,Johan, Mohd Rafie,Khaligh, Nader Ghaffari,Zaharani, Lia
, (2021)
Available online Two new acid salts were synthesized, and their chemical structures were characterized by various spectra data analyses. Although 1H NMR did not show acid proton of [HSO4]?, the FTIR spectra of molten acid salts act as key support to approve of their chemical structures. The structure elucidation of the molten acid salts demonstrated the existence of 4,4?-trimethylene-N,N?-dipiperidinium dication with sulfate and hydrogen sulfate anion(s). Thus, sulfuric acid can act as a diprotic or monoprotic Br?nsted acid when it is treated by a secondary amine regarding the initial mole ratio of sulfuric acid and amine. Also, the catalytic activity of these molten acid salts was investigated for the hydrolytic conversion of (1,3,3,3-tetrachloropropyl)benzene to cinnamic acid. The desired product was obtained in 88 ± 2.0% yield under optimal conditions. The molten acid salts were high recyclable and their chemical structure and catalytic efficiency showed no significant change even after the 5th run. Furthermore, TMDP-SA (1:1) showed a much weaker corrosive property compared with TMDP-SA (1:2) and SA (98%), and the surface of stainless steel was intact even after 24 h. This fact and the acidity of two molten acid salts also confirm the proposed chemical structures.
Robust Fe3O4/SiO2-Pt/Au/Pd magnetic nanocatalysts with multifunctional hyperbranched polyglycerol amplifiers
Zhou, Li,Gao, Chao,Xu, Weijian
, p. 11217 - 11225 (2010)
Here we report a facile approach to prepare multicarboxylic hyperbranched polyglycerol (HPG)-grafted SiO2-coated iron oxide (Fe 3O4/SiO2) magnetic hybrid support. This support combined the both features of Fe3O4 and HPG, facile magnetic separation, and favorable molecular structure with numerous functional groups. With the use of the grafted-HPGs as templates, various noble metal nanocatalysts such as Pt, Au, and Pd were directly grown on the surfaces of magnetic support with ultrasmall and nearly monodisperse sizes (e.g., the average sizes of Pt, Au, and Pd are 4.8 ± 0.5, 6.0 ± 0.6, and 4.0 ± 0.4 nm, respectively) and high coverage densities. Because of the amplification effect of HPG, high loading capacities of the nanocatalysts, around 0.296, 0.243, and 0.268 mmol/g for Pt, Au, and Pd, respectively, were achieved. Representative catalytic reactions including reduction of 4-nitrophenol, alcohol oxidation, and Heck reaction demonstrated the high catalytic activity of the noble metal nanocatalysts. Because of the stabilization of HPG templates, the nanocatalysts can be readily recycled by a magnet and reused for the next reactions with high efficiencies. The robust multifunctional magnetic hybrids will find important applications in catalysis and other fields such as drug delivery and bioseparations.
Post-synthesis functionalization of MIL-101 using diethylenetriamine: A study on adsorption and catalysis
Kim, Se-Na,Yang, Seung-Tae,Kim, Jun,Park, Ji-Eun,Ahn, Wha-Seung
, p. 4142 - 4147 (2012)
An effective metal organic framework (MOF) catalyst (DETA-MIL-101) was prepared by grafting an electron-rich triamine functional group to the open metal sites in MIL-101. The samples were characterized via XRD, FT-IR, and N2 adsorption-desorption measurements, and their N content was measured using EA. The CO2 and H2O adsorption-desorption properties were measured and compared with those of non-functionalized MIL-101. Their catalytic performances in the Knoevenagel condensation between benzaldehyde and malononitrile were examined, and the catalyst stabilities were confirmed using recycling and hot filtering experiments. Finally, the Pd 2+ ions (0.5, 1.0, and 3.0 wt%) were immobilized onto the amine species that were grafted to the MIL-101 using PdCl2 and were tested for Heck reactions of the acrylic acid and iodobenzene in N,N-dimethylacetamide as a solvent with triethylamine additives as a function of time. The catalyst stability was re-established via recycling and hot filtering experiments.
ARYLATION OF OLEFINS BY PHENYL DERIVATIVES OF NONTRANSITION METALS IN PRESENCE OF PLATINUM(IV) AND GOLD(III) COMPLEXES
Nizova, G. V.,Shul'pin, G. B.
, p. 2211 (1981)
-
Coordinative Role of Alkali Cations in Organic Reactions.V. The Perkin Reaction
Poonia, Narinder S.,Sen, Swagata,Porwal, Prafulla K.,Jayakumar, A.
, p. 3338 - 3343 (1980)
The Perkin condensation of benzaldehyde (PhCHO) and acetic anhydride (Ac2O) in the presence of an alkali acetate (M+OAc-) involves extensive participation of M+ and take place best with K+OAc-.Employing an excess of meticulousy dehydrated K+OAc-, a record high yield of cinnamic acid (ca.75percent) can be obtained in a 60 min reaction.The product of the reaction before hydrolysis is not PhCH=CHCOOCOCH3 as usually believed but potassium cinnamate plus K+(OAc,HOAc)-.Conductometric solution stability studies on M+-ligand (M+=Na+ and K+; Ligand=PhCHO, o-NO2C6H4CHO,o-HOC6H4CHO) systems in 2-propanol show that stabilty sequences for PhCHO and o-NO2C6H4CHO are NaOAc+OAc- in 2-propanol.
Discovery of 6-Oxo-4-phenyl-hexanoic acid derivatives as RORγt inverse agonists showing favorable ADME profile
Nakajima, Ryota,Oono, Hiroyuki,Kumazawa, Keiko,Ida, Tomohide,Hirata, Jun,White, Ryan D.,Min, Xiaoshan,Guzman-Perez, Angel,Wang, Zhulun,Symons, Antony,Singh, Sanjay K.,Mothe, Srinivasa Reddy,Belyakov, Sergei,Chakrabarti, Anjan,Shuto, Satoshi
, (2021/02/09)
The retinoic acid receptor-related orphan nuclear receptor gamma t (RORγt), which is a promising therapeutic target for immune diseases, is a major transcription factor of genes related to psoriasis pathogenesis, such as interleukin (IL)-17A, IL-22, and IL-23R. Inspired by the co-crystal structure of RORγt, a 6-oxo-4-phenyl-hexanoic acid derivative 6a was designed, synthesized, and identified as a ligand of RORγt. The structure–activity relationship (SAR) studies in 6a, which focus on the improvement of its membrane permeability profile by introducing chlorine atoms, led to finding 12a, which has a potent RORγt inhibitory activity and a favorable pharmacokinetic profile.
Cleavage of Carboxylic Esters by Aluminum and Iodine
Sang, Dayong,Yue, Huaxin,Fu, Yang,Tian, Juan
, p. 4254 - 4261 (2021/03/09)
A one-pot procedure for deprotecting carboxylic esters under nonhydrolytic conditions is described. Typical alkyl carboxylates are readily deblocked to the carboxylic acids by the action of aluminum powder and iodine in anhydrous acetonitrile. Cleavage of lactones affords the corresponding ω-iodoalkylcarboxylic acids. Aryl acetylates undergo deacetylation with the participation of the neighboring group. This method enables the selective cleavage of alkyl carboxylic esters in the presence of aryl esters.
MOF-Zn-NHC as an efficient N-heterocyclic carbene catalyst for aerobic oxidation of aldehydes to their corresponding carboxylic acids: Via a cooperative geminal anomeric based oxidation
Babaee, Saeed,Zarei, Mahmoud,Zolfigol, Mohammad Ali
, p. 36230 - 36236 (2021/12/02)
As an efficient heterogenous N-heterocyclic carbene (NHC) catalyst, MOF-Zn-NHC was used in the aerobic oxidation of aryl aldehydes to their corresponding carbocyclic acids via an anomeric based oxidation. Features such as mild reaction conditions and no need for a co-catalyst or oxidative reagent can be considered as the major advantages of the presented method in this study. This journal is
