4,5-Dichloro-2-octyl-isothiazolone (DCOIT) (link:https://www.bloomtechz.com/synthetic-chemical/organic-intermediates/4-5-dichloro-2-octyl-isothiazolone-cas-164359.html) belongs to the class of isothiazoline compounds with the chemical formula C11H19Cl2NOS and contains organic and inorganic components.
1. Structure:
The main structure of DCOIT consists of two parts: one is a benzene ring containing two chlorine atoms, and the other is an isothiazoline ring. They are linked together by a long octyl chain. This structure makes DCOIT have good properties in terms of sterilization and anticorrosion.
2. Functional groups:
There are several important functional groups in the structure of DCOIT:
- Chlorine atom (Cl): DCOIT contains two chlorine atoms, which endow DCOIT with strong bactericidal and antibacterial capabilities.
- Isothiazolone ring: This ring structure makes DCOIT antibacterial and enhances its killing effect on microorganisms.
- Octyl chain (octyl chain): The octyl chain makes DCOIT have good solubility and permeability, and can better exert its bactericidal and antiseptic effects.
3. Chemical properties:
- Stability: DCOIT is relatively stable under normal storage conditions. However, it can be affected by factors such as light, heat, oxidizing agents and acids, leading to degradation or loss of activity.
- Solubility: DCOIT has low solubility in water, but good solubility in organic solvents such as alcohols and ketones.
- pH stability: DCOIT exhibits good stability in neutral and weakly acidic conditions, but may degrade in alkaline conditions.
- Scope of activity: DCOIT has a broad-spectrum killing effect on various microorganisms such as fungi, bacteria and algae.
A commonly used method to synthesize DCOIT is to prepare 4,5-Dichloro-2-octyl-isothiazolone by chlorination of 5-chloroisothiazolin-3-one. The following is a possible synthetic route:
1. Starting from 5-chloroisothiazolin-3-one, octyl groups can be introduced by reacting under basic conditions with chlorinating reagents such as chloroalkanes such as 1-bromooctane. The reaction is usually carried out in an organic solvent such as dichloromethane or chloroform. Reaction temperature and reaction time may vary, and specific conditions can be optimized by trial and error.
2. After the reaction is complete, neutralize the alkaline substances in the reaction solution by adding a hydrolysis agent (such as water or alcohol), and extract the reaction mixture into an organic solvent.
3. The extracted organic phase can be purified by vacuum distillation or extraction to remove inorganic salts and unreacted raw materials.
4. Finally, the purified product is further refined by methods such as crystallization and recrystallization.
It should be noted that the above synthesis route is for reference only, and the specific synthesis conditions, reaction parameters and purification methods may vary due to actual operation requirements. Therefore, in practice, it is recommended to use professional chemical laboratories and equipment, and refer to relevant literature and patent information to obtain more accurate and detailed synthesis methods.
4,5-Dichloro-2-octyl-isothiazolone (DCOIT) is an important organic synthetic compound commonly used in antiseptic and antiseptic applications. The following is a method for synthesizing DCOIT in a laboratory, and the synthetic route is as follows:
Step 1: Synthesis of 5-chloroisothiazolin-3-one
First, 5-chloroisothiazolin-3-one needs to be synthesized as the precursor compound of DCOIT. The method of synthesizing 5-chloroisothiazolin-3-one is as follows:
step:
1. In a dry reaction vial, add 2-aminothiazole (1) (10 g, 0.1 mol) and PCl5 (25 g, 0.12 mol).
2. Seal the reaction vial and stir with a stirrer at room temperature for 24 hours.
3. After the reaction was completed, the reaction mixture was directly dissolved in CH3CN to obtain a cloudy solution.
4. Filter the cloudy solution, and concentrate the filtrate to dryness with a rotary evaporator.
5. Mix the dried product with an appropriate amount of water to crystallize 5-chloroisothiazolin-3-one.
6. Collect the crystalline product by filtration and washing, and dry it.
At this point, you have obtained 5-chloroisothiazolin-3-one as a reaction intermediate in the next step.
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Step 2: Synthesis of 4,5-Dichloro-2-octyl-isothiazolone (DCOIT)
Now, convert 5-chloroisothiazolin-3-one into DCOIT. Methods as below:
step:
1. In a dry reaction vial, add 5-chloroisothiazolin-3-one (2) (10 g, 0.07 mol), 1-bromooctane (3) (15 g, 0.08 mol) and Et3N (30 mL, 0.21 mol ).
2. The reaction mixture was stirred at room temperature for 24 hours.
3. After the reaction was complete, the reaction mixture was extracted with CH2Cl2.
4. Collect the organic phase and neutralize it with NaOH solution, then extract the CH2Cl2 phase.
5. Concentrate the organic phase to dryness using a rotary evaporator.
6. Mix the dried product with an appropriate amount of CHCl3, and purify DCOIT by crystallization.
7. Finally, the purified DCOIT product was collected by filtration and washed, and dried.
It is worth noting that the above steps only provide an example method for the laboratory synthesis of DCOIT. In practice, temperature, reaction time, and reagent ratios may need to be optimized. Additionally, it is important to handle organic reagents using proper safety measures and equipment to ensure safe and compliant laboratory operations. In addition, in order to obtain the most accurate and reliable synthesis scheme, please refer to the relevant chemical literature or patent information, and rely on the guidance and advice of chemical experts to ensure that your synthesis experiments can go smoothly.