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Hexamine is the scientific name for the heterocyclic organic molecule C6H12N4. Methenamine, hexamine, and urotropin are other names for hexamethylenetetramine, a heterocyclic organic molecule with the formula (CH2)6N4.
- This white crystalline substance is very soluble in polar organic solvents and water.
- Its cage-like structure is comparable to that of adamantane.
- It is helpful in the production of other organic molecules, such as additives for rubber, plastics, and medications. At 280 °C, it sublimes in a vacuum.
- The most typical application of it is to treat urinary tract infections since it functions as an anti-infective drug.
- The slow release of formaldehyde (CH2O) caused by hydrolysis at an acidic pH of 0.2 molars is what gives it its anti-infective properties.
- Methenamine is a hygroscopic, odourless, colourless, glossy crystal or white crystalline powder.
Key Terms: Hexamine, Methenamine, Hexamine, Urotropin, Organic Substances, Hexamethylenetetramine, Amines
What is Hexamine?
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Hexamine, with the chemical formula C6H12N4, is a heterocyclic organic substance. It is also known as methenamine, urotropin, and hexamethylenetetramine.
- The most frequently used component to treat urinary tract infections is hexamine, which functions as an anti-infective agent.
- In 1859, Alexander Butlerov discovered hexamine powder.
- It is made industrially by combining ammonia with formaldehyde, and the reaction can take place in either a gas phase or a solution.
- The molecule has a symmetric tetrahedral cage-like structure, like adamantane, where the four "corners" are nitrogen atoms and the "edges" are methylene bridges.
- Hexamine's anti-infective properties result from the hydrolysis process, which releases formaldehyde (CH2O) slowly at a pH of 0.2 molars.
- Methenamine is a white hygroscopic crystalline powder or a colourless, odourless, and glossy crystal.
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Synthesis of Hexamine
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Aleksandr Butlerov discovered hexamine powder in 1859. Ammonia and formaldehyde are combined to create them in industrial settings. Both a gas phase and a solution can be used to conduct this reaction.
- The molecule resembles adamantane in that it has a symmetric tetrahedral cage-like structure, where the four "corners" are nitrogen atoms and the "edges" are methylene bridges.
- Although their molecular shape defines a cage, unlike larger cryptand or crown ether structures, none of the vacant space is accessible at the interior for tying more molecules or atoms.
- The molecule exhibits the same behaviours as an amine base through protonation and N-alkylation (for example, Quaternium-15).
Properties of Hexamine
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Some characteristics of the hexamine are:
- Hexamine has the chemical formula C6H12N4 in its name.
- Hexamine has a density of 1.33 g/cm3.
- C6H12N4 has a molecular weight of 140.186 g/mol.
- Hexamine's boiling point can be expressed as "Sublimes,"
- Hexamine's melting point might be specified as 280°C,
- This substance smells fishy (Ammonia).
In brief, it can be listed as:
| Type | Classification |
|---|---|
| Hexamine chemical formula | C6H12N4 |
| Molecular Weight of Hexamine | 140.186 g/mol |
| Density of C6H12N4 | 1.33 g/cm3 |
| Melting point of Hexamine (C6H12N4) | 280 °C |
| Boiling point of C6H12N4 | Sublimes |
Hexamine Structure
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The structure of Hexamine is shown below:
Hexamine Structure
Hexamine Uses
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Some of the many uses of Hexamine include:
- Used in the manufacture of phenolic resins that are powdered or liquid uses hexamine.
- Used in brake and clutch linings as binders.
- Used as a spray or cream to relieve concurrent odour and excessive perspiration.
- Used as a component of Grocott's methenamine silver stain.
- Used as a solid fuel source.
- Used as a food preservation agent.
- A key component in the production of RDX.
- To stop rubber from becoming vulcanised.
- Used to prevent corrosion in steel.
Application of Hexamine
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When the mandelic acid salt decomposes at an acidic pH, it produces ammonia and formaldehyde, which are bactericidal and the mandelic acid adds to this effect. This salt is used to treat urinary tract infections.
- Hexamine is thought to be appropriate for long-term preventive therapy for urinary tract infections.
- Since the mandelic acid salt (a generic form of methenamine mandelate, USP) is used to treat urinary tract infections, it breaks down at an acidic pH to produce ammonia, which formaldehyde adds to for bactericidal effects. Typically, co-administration of ammonium chloride or vitamin C ensures urine acidity (otherwise an ascorbic acid).
- Hexamine is successfully used to cure concurrent odour and excessive sweating together with the medical citation in the form of sprays and lotions.
Hexamine Tablets
Some other medical purpose uses of hexamine include:
Solid Fuel
To heat camp food or military supplies, hobbyists, campers, aid workers, and military organisations employ the hexamine fuel tablets component in combination with 1,3,5-trioxane.
It has a high energy density of 30.0 megajoules per kilogramme (MJ/kg), burns without producing smoke, does not leave behind ashes, and emits hazardous gases.
To test the flammability of rugs and carpets, fire-protection laboratories employ the 0.149 g standardised hexamine tablets as a clean, repeatable fire source.
Food Additive
Additionally, hexamine can be added to food as a preservative (with the INS number 239). It is authorised for use in the EU for this purpose and is listed under E number E239. Other nations, including the USA, Australia, Russia, and New Zealand, have not authorised it.
Reagent in Organic Chemistry
A useful reagent for organic synthesis is a hexamine compound. It can be utilised in the Sommelet reaction, the Delepine reaction, and the Duff reaction, all of which involve the formylation of arenes (by converting benzyl halides to aldehydes).
Explosives
Hexamine serves as the building block for the creation of RDX, C-4, Octogen, hexamine piper chlorate, hexamine dinitrate, and HMTD.
Health Hazards Associated with Hexamine
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Mucous membranes, eye irritation, upper respiratory skin, and tract irritation are a few signs of health hazards caused by Hexamine. Breathing difficulties and coughing may result from inhaling this substance. Rashes, redness, discomfort, and burns result from contact with the skin.
It also causes pain, redness, and blurred vision when it comes into contact with the eyes. Hexamine produces discomfort and upsets the digestive and urinary tracts when it is swallowed. Hexamethylenetetramine compounds can be hazardous when ingested, inhaled, or absorbed via the skin. Additionally, it irritates the upper respiratory system, skin, mucous membranes, and eyes.
Things to Remember
- The chemical formula for hexamine is C6H12N4, and it is a heterocyclic organic substance.
- Hexamine is also known as methenamine, hexamethylenetetramine, and urotropin.
- The most often used substance to treat urinary tract infections is hexamine, which has anti-infective properties.
- Hexamine is used to make dinitrosopentamethylene-tetramine, a blowing agent for rubber, which is one of its main applications.
- It is used in the production of a wide range of products, including solid fuel tablets, textiles, plywood, paints, foundry resins, plastics, paints, and textiles.
- Unstabilized hexamine is used in the production of explosives, the chemical detection of metals, and the preservation of hides.
Read Also:
| Chapter-Related Links | ||
|---|---|---|
| Phosphine | Hydrogen Chloride | Bonding in Metal Carbonyls |
| Aqua Regia | Organometallic Compounds | Dioxygen |
Sample Questions
Ques. What is Hexamine? (2 marks)
Ans: Hexamine, with the chemical formula C6H12N4, is a heterocyclic organic substance. It is also known as methenamine, urotropin, and hexamethylenetetramine.
Ques. By whom and how was hexamine discovered? (2 marks)
Ans: Aleksandr Butlerov discovered hexamine powder in 1859. Ammonia and formaldehyde are combined to create them in industrial settings. Both a gas phase and a solution can be used to conduct this reaction.
Ques. Where is hexamine generally found? (2 marks)
Ans: Antibiotics, solid fuel tablets for cooking while camping or trekking, rubber/textile adhesives, paints, lacquers, photography products, and deodorant and hair product manufacturing all contain this chemical.
Ques. What is the common side effect of hexamine? (2 marks)
Ans: Hexamine may cause a skin allergy. If an allergy develops, very low future exposure can cause itching and a skin rash. exposure can cause asthma attacks with shortness of breath, wheezing, coughing, and/or chest tightness.
Ques: Which hexamine product is used in titrations? (2 marks)
Ans: Before the substitution reaction of Cu(2)XO(2-) with EDTA, hexamine must dissociate from Cu(23)XOL(2-). Hexamine, therefore, slows down the rate of XO's colour change in the copper-EDTA titration at concentrations more than 10(-3)M.
Ques: Who uses hexamine tablets? (2 marks)
Ans: Campers, soldiers, and aid organisations all utilise tablets for cooking. They are frequently utilised with field ration packs' disposable metal stoves. Typically, a batch procedure is used to evaporate a mixture of an aqueous solution of formaldehyde and ammonia to produce this product.
Ques: What are the general properties of hexamine? (3 marks)
Ans: The general properties of hexamine
- The name hexamine contains the molecular formula C6H12N4.
- The density of hexamine is 1.33 g/cm3.
- The molecular weight of C6H12N4 is 140.186 g/mol.
- The boiling point of hexamine can be written as "Sublimes,"
- Hexamine has a melting point of 280 degrees Celsius, and it has a foul odour (Ammonia).
Ques: What are the health problems related to hexamine? (3 marks)
Ans: A few symptoms include inflammation of the mucous membranes, eyes, upper respiratory tract, and skin. Inhaling this chemical may cause coughing and breathing problems. As a result of its interaction with the skin, rashes, redness, pain, and burns occur. On the other hand, when it comes into contact with the eyes, it results in pain, redness, and blurred vision. When hexamine is ingested, it causes discomfort and disturbs the urinary and digestive systems. Compounds containing hexamethylenetetramine can be dangerous when swallowed, breathed, or absorbed via the skin. Additionally, it irritates the eyes, skin, mucous membranes, and upper respiratory system.
Ques: Draw the structural formula of hexamine. (2 marks)
Ans: The structural formula of hexamine is
Structural Formula of Hexamine
Ques: What are the medical uses of hexamine? (5 marks)
Ans: The medical uses of hexamine are as follows:
- At an acidic pH, the mandelic acid salt breaks down to make ammonia and formaldehyde, both of which are bactericidal and which the mandelic acid contributes to this action. To treat urinary tract infections, use this salt. Due to this drug's drawbacks, particularly the chemically-induced hemorrhagic cystitis that can happen in the event of an overdose, it was briefly restricted in the late 1990s.
- Hexamine is regarded as suitable for long-term prophylactic treatment for urinary tract infections. Hexamine shouldn't be used if you have chronic kidney problems. Hexamine is used as a treatment for concomitant odour and excessive sweating.
- Since the mandelic acid salt (a generic form of methenamine mandelate, USP) is used to treat urinary tract infections, it breaks down at an acidic pH to produce ammonia, which formaldehyde adds to for bactericidal effects. Typically, co-administration of ammonium chloride or vitamin C ensures urine acidity (otherwise an ascorbic acid).
- The late 1990s saw a temporary decrease in the use of this substance due to its side effects, particularly the chemically-induced hemorrhagic cystitis that can occur when an overdose occurs. However, due to the incidence of antibiotic resistance to medications that are more often used, its use has currently been reapproved. Because the germs do not become resistant to formaldehyde, this medication is particularly well suited for long-term preventative therapy for urinary tract infections. Additionally, if you have chronic kidney illness, you shouldn't use
- Hexamine is successfully used to cure concurrent odour and excessive sweating together with the medical citation in the form of sprays and lotions.
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