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Coumarin synthesis refers to the chemical reaction where the phenols react with beta-keto esters in the presence of a condensing agent. The research began in 1820 when Vogel isolated coumarin from tonka beans for the first time. The preparation of coumarin synthesis involves treating sodium salt with acetic anhydride. Various methods and procedures for synthesizing coumarin derivatives have been devised from diverse chemicals such as aldehydes, phenols, ketones, and carboxylic acids.
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Key Terms: Coumarin synthesis, Coumarin, Glucose-6-phosphatase, Keto group, Perkin reaction
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What is Coumarin?
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Coumarin, also known as 1-benzopyran-2-one, is a chemical compound with the molecular formula C?H?O?. It is a chemical molecule found in many plants that belong to the benzopyrone family of organic compounds (and maybe termed lactone). A benzene molecule with two neighboring hydrogen atoms substituted by a chain(CH)=(CH)(C=O)O, producing a second six-membered heterocycle that shares two carbons with the benzene ring, can be represented. Coumarin may be found in high amounts in a variety of plants, including the tonka bean.
Coumarin is a colorless crystalline solid with a pleasant odor similar to vanilla and a bitter taste, according to its physical qualities. Animals avoid the chemical because of its bitter taste, even if it has a pleasing odor. Coumarin is present in a wide range of plants, where it assists in the chemical defense against predators. Warfarin, a similar substance that reduces the development of blood clots and deep vein thrombosis, is utilized because it inhibits the production of vitamin K.
Synthesis of Coumarin
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Coumarin is a naturally occurring volatile active chemical that may be found in a variety of plants. Coumarin can also be found in edible plants like strawberries and cherries. Cassia cinnamon, Ceylon cinnamon, deer tongue, mullein, and several cherry blossom tree species of the genus Prunus are among additional plants that contain significant levels of coumarin.
It is a white crystal with a melting point of roughly 340K at room temperature. Coumarin can be made by a variety of reactions. The Perkin reaction, which involves salicylaldehyde and acetic anhydride, is a popular way to make coumarin. Another process that produces coumarin and its derivatives is the Pechmann condensation.
Coumarin is made by reacting acetic anhydride with the sodium salt of ortho-hydroxybenzaldehyde. Other techniques for the synthesis of pyrone-ring moieties in coumarins established by Pechmann Claisen, Knoevenagal, Reformatsky reaction, and Wittig are included.
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Coumarin Reactions
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There are several name reactions that aid in the formation and synthesis of coumarin. For the synthesis of coumarin, the aforementioned reaction is similar to the Perkins Reaction. The condensation of an aldehyde with a carboxylic acid anhydride in the presence of a weak base, such as the sodium salt of the acid, results in unsaturated carboxylic acids. Perkin described the synthesis of coumarin by heating the sodium salt of salicylaldehyde with acetic anhydride for the first time in 1868. Aromatic aldehydes are affected by the reaction. It's very useful for making substituted cinnamic acids.
Coumarin Synthesis Mechanism
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- Coumarins exhibit fascinating visual features in addition to their biological functions.
- Due to their intrinsic physicochemical and photophysical properties, such as resonance stability, water solubility, and relative simplicity of synthesis.
- Coumarin derivatives have been studied extensively for electrical and photonic applications such as charge-transfer complexes, laser dyes, fluorescent whiteners, solar energy collectors, and non-linear optical materials, among others.
Coumarins are the most well-known laser dyes in the "blue-green" area, and their fluorescence varies dramatically depending on the electronic properties and regiochemical locations of their substituents.
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Things To Remember
- Coumarin is a colorless crystal, flakes, or powder with a nice vanilla odor and a harsh pungent burning flavor.
- The chemical name for coumarin is a hydroxycinnamic acid. Many plants produce this pleasant-smelling chemical, which is released as they wilt. By competing with Vitamin K, it has anticoagulant properties.
- Coumarin is a chromenone with a keto group in the second position.
- It functions as a luminous dye, a plant metabolite, and a human metabolite, among other things.
- Coumarin and several of its metabolites have been demonstrated to inhibit glucose-6-phosphatase in the liver and in microsomal preparations of the liver.
- Coumarin was Previously used as a flavoring and fragrance in foods and medicines. Soaps, tobacco, and rubber goods, Also are used as a deodorizing and odor enhancing ingredients.
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Sample Questions
Ques. What are the Various Uses of Coumarin? (3 marks)
Ans. The various uses of coumarin include -
- Coumarin dyes are utilized as a gain medium in blue-green organic dye lasers. Coumarins 480, 490, and 504 are examples of coumarin laser dyes. Coumarin tetramethyl laser dyes have a wide tuning range and are also employed as a sensitizer in older photovoltaic systems.
- Coumarin is a rodenticide precursor that is frequently utilized in the pharmaceutical business to make a variety of synthetic anticoagulant medicines.
- Medicine- A coumarin also called warfarin, with the trade name Coumadin, is a prescription anticoagulant that prevents blood clots from forming and is used to treat deep vein thrombosis and pulmonary embolism. It prevents blood clots from forming as a result of atrial fibrillation, thrombotic stroke, and transient ischemic episodes.
Ques. What are the Natural Occurrences of Coumarin? Give a Brief Description of the Biological Function of Coumarin. (3 marks)
Ans. Coumarin is found in vanilla grass, sweet woodruff, sweet grass, and sweet-clover, all of which are dubbed "sweet" because of the compound's sweet (pleasant) odor. Coumarin can also be detected in Justicia pectoralis extracts.
Biological Function- Coumarin possesses appetite-suppressing characteristics that assist animals avoid consuming plants that contain coumarin extracts. Coumarin is present in a wide range of plants, where it assists in the chemical defense against predators. Because vitamin K production is inhibited, a similar substance known as warfarin is used to prevent blood clots, pulmonary embolism, and deep vein thrombosis.
Ques. Which aldehyde is used to prepare coumarin? (2 marks)
Ans. Simple or modified salicylaldehydes (4-hydroxy, 5-Bromo) and methylene compounds (dimethyl malonate, ethyl cyanoacetate, ethyl 3-oxo-3-phenylpropionate) were employed to make coumarin derivatives (Scheme 1). The yields were high (61–96%), and DES served as a solvent as well as a catalyst.
Ques. Where can coumarin be found? (2 marks)
Ans. It may be found in a variety of plant sources, including vegetables, spices, fruits, and medicinal plants, and it can be found in all sections of the plant, including the fruits, roots, stems, and leaves. Coumarin is present in high proportions in certain varieties of cinnamon, which is one of the most common sources of human exposure.
Ques. Is coumarin a cigarette? (2 marks)
Ans. Coumarin, which was initially isolated from Tonka tree beans in 1820, has long been utilized as a cigarette addiction by the tobacco industry. The tobacco industry considers coumarin, which has a flavor similar to "new-mown-hay," to be an important addition that considerably improves the taste.
Ques. How is coumarin formed? (2 marks)
Ans. Coumarin is made by reacting acetic anhydride with the sodium salt of ortho-hydroxybenzaldehyde. Other techniques for the synthesis of pyrone-ring moieties in coumarins established by Pechmann Claisen, Knoevenagal, Reformatsky reaction, and Wittig are included.
Ques. Can you eat coumarin? (2 marks)
Ans. Cinnamon sticks can be eaten. The majority of people, however, do not swallow the stick in its hole. They rip bits off and gnaw on them. Chewing on a cinnamon stick in moderation might be helpful to your health. Coumarin has a daily limit of 0.05 mg per pound (0.1 mg per kg) of body weight. This is the maximum amount of coumarin you may consume in one day without experiencing negative effects ( 3 ). For a 178-pound adult, this translates to up to 8 milligrammes of coumarin each day (81 kilograms).
Ques. Is Coumarin flavonoid? (2 marks)
Ans. Coumarins and flavonoids are heterocyclic compounds that have been linked to a variety of health benefits, including lowering the risk of cancer, diabetes, cardiovascular disease, and cognitive decline. Coumarins are phenolic compounds made of bonded benzene and pyrrole rings. There are at least 1300 distinct coumarins known. Coumarins have anticoagulant, anti-inflammatory, and vasodilator properties. The most common is warfarin, which is used as an oral coagulant and rodenticide.
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