Pure Oxymetazoline CAS 1491-59-4

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Pure oxymetazoline, CAS 1491-59-4, The molecular formula C16H24N2O is a benzene compound that appears as colorless or pale yellow crystals and has a sweet taste. Stable at room temperature, soluble in water, alcohols, and some organic solvents. It is an important organic chemical with multiple applications. Hydroxymetazoline is an alpha agonist with excellent peripheral vasoconstrictive effects. It induces constriction of nasal mucosal blood vessels through direct activation of vascular alpha-1 receptors, thereby reducing congestion and edema caused by inflammation. Hydroxymetazoline takes effect quickly, usually within a few minutes, and lasts for several hours, effectively relieving nasal congestion. In addition, it has an antihistamine effect, which can inhibit the release of allergens and inflammatory substances such as histamine, and suppress the growth of spoilage bacteria in the nasal and throat mucosa, exhibiting strong antibacterial and anti-inflammatory effects.

Pure oxymetazoline, as a representative drug of alpha adrenergic receptor agonists, directly stimulates the alpha adrenergic receptors in vascular smooth muscle to induce peripheral vascular constriction, becoming a widely used drug in the fields of otolaryngology and ophthalmology. Its core use revolves around the pathological and physiological characteristics of the nasal mucosa and eyes, with the function of quickly relieving symptoms and assisting in treatment.

The core position of nasal disease treatment

 

1.  Acute rhinitis and cold related nasal congestion
Hydroxymetazoline is the preferred topical medication for acute viral rhinitis (cold). By constricting the blood vessels of the nasal mucosa, nasal turbinate swelling can be significantly reduced within 5-10 minutes, and symptoms such as nasal congestion and runny nose can be alleviated. Clinical research shows that after a single use of 0.05% concentration spray, nasal ventilation can be increased by 60% -80%, lasting for 8-12 hours. For pediatric patients aged 6 and above, it is recommended to apply 1-2 sprays through the unilateral nasal cavity twice a day to effectively avoid systemic side effects.

 

2. Combination therapy for allergic rhinitis
In the treatment of allergic rhinitis, hydroxymetazoline works through a dual mechanism: firstly, it directly contracts blood vessels to reduce mucosal edema; Secondly, it inhibits the release of inflammatory mediators such as histamine, reducing symptoms such as sneezing and nasal itching. The triple therapy of "hydroxymetazoline+antihistamines+nasal steroids" is commonly used in clinical practice, which significantly improves symptom control rate. For example, for patients with seasonal allergic rhinitis, the use of hydroxymethylazoline in the morning can quickly relieve the nasal congestion at night, cooperate with loratadine to control the systemic allergic reaction, and use mometasone furoate nasal spray at night to prevent the recurrence of mucosal inflammation.

 

3. Precise treatment of special types of rhinitis
Hypertrophic rhinitis: Long term mucosal hypertrophy leads to persistent nasal congestion, and hydroxymetazoline can temporarily reduce the size of the inferior turbinate to alleviate symptoms, but caution should be exercised about the risk of drug-induced rhinitis.
Vasomotor rhinitis: For those who are sensitive to temperature and humidity changes, hydroxymetazoline can quickly block vasodilation reactions, and it is recommended to use it as needed.
Pregnancy induced rhinitis: Pregnant women are prone to nasal congestion due to changes in hormone levels. Hydroxymetazoline has a higher safety profile for short-term use (≤ 3 days) after mid pregnancy, but strict monitoring of blood pressure is necessary.

 

4. Adjuvant treatment for chronic rhinosinusitis
Chronic sinusitis patients often experience poor drainage due to swelling of the sinus mucosa. Hydroxymetazoline can constrict the blood vessels around the sinus opening, improving ventilation and drainage. Research has shown that using hydroxymetazoline three days before surgery can reduce sinus surgery bleeding by 30% -40%, and postoperative combined use can reduce the incidence of sinus adhesions. For patients with combined nasal polyps, short-term use of hydroxymetazoline can reduce the volume of polyps and create conditions for surgical resection.

Expansion and standardization of ophthalmic applications

 

1. Symptomatic treatment of allergic conjunctivitis
Hydroxymetazoline eye drops (0.025% -0.05%) relieve symptoms such as redness and itching within 15 minutes by constricting conjunctival blood vessels. Its advantage lies in its faster onset than antihistamines, especially suitable for acute attacks. Clinical recommendations include 2-3 times a day, with a course of treatment not exceeding 7 days, to avoid causing rebound congestion.

2. Adjuvant treatment for non infectious conjunctivitis
Hydroxymetazoline can quickly improve the appearance of conjunctival congestion caused by smoke, contact lens wear, eye fatigue, etc., but infectious causes need to be ruled out.

 

For example, before using hydroxymetazoline in patients with conjunctivitis after swimming, conjunctival sac flushing should be performed first to prevent the drug from masking the signs of bacterial infection.

3. Preoperative preparation for ophthalmic surgery
Before cataract, glaucoma and other surgeries, hydroxymetazoline eye drops can constrict the blood vessels around the pupil, reducing the risk of intraoperative bleeding. Research has shown that using a 0.05% solution 30 minutes before surgery can reduce conjunctival congestion index by 50% and improve surgical field clarity by 30%.

The auxiliary value in surgery and examination

 

1. Intraoperative management of nasal endoscopic surgery
Local application of hydroxymetazoline cotton pads can significantly shrink the nasal turbinate mucosa, allowing for more complete exposure of the surgical field. For example, in the correction of nasal septum deviation surgery, placing cotton pads soaked in 0.05% solution in the bilateral middle nasal passages 10 minutes before surgery can reduce intraoperative bleeding from an average of 80ml to 30ml and shorten surgical time by 20%.

2. Optimization of CT/MRI Examination of Sinuses
For patients with sinusitis, the use of hydroxymetazoline before examination can shrink the mucosa, reduce soft tissue shadows in the sinus cavity, and improve the detection rate of lesions.

 

It is recommended to inject 2 sprays into the unilateral nasal cavity 30 minutes before the examination, which can increase the maxillary sinus translucency by 40%.

3. Assessment of adenoid hypertrophy in children
Before taking nasopharyngeal lateral radiographs, the use of hydroxymetazoline can reduce the volume of adenoids and more accurately assess their degree of occupancy. Research has shown that the adenoid nasopharyngeal ratio (A/N value) decreases by an average of 0.15 after medication, which helps distinguish between physiological hypertrophy and pathological obstruction.

Clinical applications in special scenarios

 

1. Prevention of aviation sinusitis
During high-altitude flight, changes in cabin pressure can easily cause congestion of the sinus mucosa. Using hydroxymetazoline 30 minutes before takeoff can prevent sinus pain, especially for frequent flyers. It is recommended to spray one nozzle into one side of the nasal cavity and repeat every 6 hours during the flight.

2. Emergency management of nosebleeds
Local compression of hydroxymetazoline cotton pads can quickly constrict blood vessels around the bleeding point, and when combined with silver nitrate cauterization or Vaseline gauze filling, the success rate of hemostasis can reach 90%.

 

For bleeding in the Li's area, it is recommended to use 4cm × 1cm cotton pads soaked in 0.05% solution, which can be compressed for 5 minutes to take effect.

3. Detoxification of drug overdose
Accidentally taking oral preparations of hydroxymetazoline (such as nasal drops in children) may lead to severe hypotension and bradycardia. The treatment requires immediate intravenous injection of phentolamine (an alpha receptor antagonist), with an initial dose of 0.1-0.5mg/kg, and the infusion rate adjusted according to blood pressure.

There are two main methods for the preparation of Pure Oxymetazoline.

1. By acid catalysis of fructose

Fructose is heated and reacted under acidic conditions to hydrolyze to carboxyaldehyde, and then further dehydrated condensation reaction to get Oxymetazoline. Fructose (fructose) is a monosaccharide that can be hydrolyzed to carboxyaldehydes when heated under acidic conditions, and then further dehydrated and condensed to obtain Oxymetazoline. The following is the chemical equation and synthetic procedure for the acid-catalyzed reaction of fructose to form Oxymetazoline.

Hydrolysis reaction of fructose:

C6H12O6 (fructose) + H2O (water) → C6H12O6 (carboxyaldehyde)

Dehydration condensation reaction:

[2C6H12O6\text{(C6H12O6)}\rightarrowC12H24O12{(C16H24N2O)}+H2O]

Synthesis Process:

First, fructose is reacted with heating under acidic conditions and hydrolysis occurs to produce carboxyaldehyde.

Then, two molecules of carboxyaldehyde undergo a dehydration condensation reaction to form Oxymetazoline . In this process, the hydroxyl and methyl groups in the carboxyaldehyde molecule combine to form the Oxymetazoline ring structure.

The final product is Oxymetazoline, which contains a five-membered oxygen ring and a hydroxyl group.

The acid-catalyzed and dehydration-condensation reactions involved in this synthesis are common types of reactions in organic synthesis by which compounds with specific structures and properties can be synthesized. In the laboratory, controlling factors such as reaction conditions, reaction temperature and time are important for both yield and product selection.

2. Oxidation in solvent

Oxymetazoline is obtained by contacting a solution containing fructose with oxygen under selective oxidation conditions.

The specific chemical equation for the oxidation of fructose in a solvent to produce Oxymetazoline is as follows:

C6H12O6 (fructose) + O2 (oxygen) → C12H24O12 (C16H24N2O) + H2O

Synthesis Process:

A solution containing fructose is brought into contact with oxygen, which is introduced as an oxidizing agent. Under conditions of selective oxidation, fructose undergoes an oxidation reaction to form hydroxymetazoline. Selective oxidation usually requires specific catalysts or reaction conditions to ensure high purity and yield of the resulting product.

The reaction process may be accompanied by the production of water, so the product needs to be subjected to appropriate extraction and purification steps at the end of the reaction to obtain a pure oxymetazoline.

This reaction process needs to be carried out under appropriate experimental conditions, including the selection of suitable catalysts, solvents and reaction temperatures to ensure efficient and highly selective oxidation of fructose to hydroxymetazoline.

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