Triphenylmethyl Chloride CAS 76-83-5

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Triphenylmethyl chloride, chemical formula C19H15Cl, CAS 76-83-5, is a white crystal or crystalline powder that is insoluble in water but easily soluble in organic solvents such as benzene, carbon disulfide, and petroleum ether. It is slightly soluble in alcohols and ethers and can be easily converted to triphenylmethanol upon absorption of water. Its melting point range is 110-114 ℃, and its boiling point can reach 374.3 ℃ at standard atmospheric pressure, indicating high thermal stability. In terms of drug synthesis, it is a key intermediate of cephalosporin drugs and participates in the preparation of antiviral drug iodine glycosides. Its derivatives are also widely used in the production of pharmaceuticals and pesticides. In addition to the pharmaceutical field, it can also serve as an initiator for resin polymers, a catalyst for organic reactions, a flour improver, a fiber decolorizer, and an exchanger for rubber products, demonstrating cross disciplinary versatility.

It is a commonly used basic organic raw material in the pharmaceutical and chemical industry, playing a key role in organic synthesis and drug development. One of its core uses is as a selective protecting group for primary hydroxyl groups in compounds such as nucleosides, monosaccharides, or polysaccharides. By forming a stable triphenylmethyl ether, it protects the target group from interference during synthesis, and the protecting group can be efficiently removed under weakly acidic conditions, combining ease of operation and selectivity. In addition, it can also be used for the protection of amino and thiol groups, as well as chemical modifications in peptide synthesis, making it an important tool for constructing complex molecular structures.

Triphenylmethyl Chloride (CAS number 76-83-5) is a white crystalline powder with the molecular formula C ₁₉ H ₁₅ Cl and a molecular weight of 278.78. Its unique triphenylmethyl structure endows it with excellent chemical stability and steric hindrance effect, making it a key intermediate in fields such as pharmaceuticals, organic synthesis, and materials science.

Pharmaceutical and Chemical Industry: A Bridge from Raw Materials to Terminal Drugs

 

1. Intermediate of cephalosporin antibiotics
It is the core side chain raw material of third-generation cephalosporins such as ceftriaxone and cefotaxime. The triphenylmethyl structure significantly enhances the stability of antibiotics against β - lactams by introducing steric hindrance, thereby expanding the antibacterial spectrum and prolonging the efficacy. For example, in the synthesis of ceftriaxone sodium, the introduction of this substance prolongs the half-life of the drug to 8 hours, and a single administration can maintain an effective concentration for 24 hours, making it one of the preferred drugs for treating community-acquired pneumonia and urinary tract infections.

 

3. Polypeptides and nucleoside chemical protecting groups
It is a selective protective reagent for primary hydroxyl, amino, and thiol groups, widely used in the synthesis of peptides, nucleosides, and carbohydrate compounds
Primary alcohol protection: In nucleoside chemistry, primary alcohol groups are easily oxidized or participate in side reactions, forming stable triphenylmethyl ether (TrO -) that remains stable under neutral and alkaline conditions, and can be efficiently removed under weakly acidic conditions (such as 1% TFA/DCM) with a yield of over 90%. For example, in the synthesis of the anti influenza drug Oseltamivir, it can prevent the oxidation of the side chain alcohol group during the synthesis process.

 

Amine protection: N-triphenylmethylation reagent (TrN) is commonly used for the protection of primary, secondary, and heterocyclic amines. The deprotection methods include the use of trifluoroacetic acid (TFA), acetic acid (AcOH), or hydrochloric acid (HCl), with mild reaction conditions and high selectivity. For example, in the synthesis of the antidepressant drug Fluoxetine, the triphenylmethyl protecting group can prevent side reactions of the amino group during the synthesis process.
Thiol protection: Triphenylmethyl sulfide (TrS -) or heterocyclic S-protected forms are widely used in total synthesis of natural products, carbohydrate and nucleoside chemistry.

 

For example, in the synthesis of anti AIDS drug Zidovudine, sulfhydryl protection can prevent it from being oxidized to disulfide.

4. Carbohydrate compound modification
It can be used for selective protection of primary alcohols in carbohydrate compounds, especially in the synthesis of complex oligosaccharides, where its steric hindrance effect can achieve region selective modification. For example, in the synthesis of heparin analogs, the triphenylmethyl protecting group can prevent specific hydroxyl groups from being sulfated, thereby controlling the anticoagulant activity of the drug.

Organic synthesis: a chemical toolbox for multifunctional reagents

 

1. Wittig reaction
It is a key reagent in the Wittig reaction, used to form inner onium salts (Ylide), thereby achieving the construction of carbon carbon double bonds. For example, in the synthesis of vitamin A derivatives, Wittig reaction can convert aldehydes or ketones into olefins with a yield of over 85%.
2. Selective protection of functional groups
Secondary alcohol protection: In the presence of secondary alcohols, primary alcohols can selectively react with triphenylchloromethane to form triphenylmethyl ether. For example, in the synthesis of sugar derivatives, selective protection of primary alcohols can be achieved by controlling reaction conditions (such as using DMAP catalysts), while secondary alcohols remain in an unreacted state.

 

Propynyl alcohol protection: It can effectively protect propynyl alcohol and prevent it from losing adjacent protons to form propadiene. For example, in the synthesis of the anti-cancer drug Paclitaxel, the protection of propargyl alcohol can prevent side chain isomerization.
Phenolic hydroxyl protection: In alkaline dichloromethane solution, phenolic hydroxyl groups with smaller steric hindrance can be selectively protected. For example, in the synthesis of the anti-inflammatory drug Ibuprofen, phenolic hydroxyl protection can prevent it from being oxidized into quinone compounds.

3. Analytical reagents
Triphenylmethyl chloride can be used to detect primary alcohols in sugars by forming triphenylmethyl ether and performing quantitative analysis using chromatographic or spectroscopic techniques. In addition, it can also be used as a standard for monitoring and optimizing organic synthesis reactions.

Materials Science: From Polymers to the Construction of Functional Materials

 

1. Resin polymer initiator
It can be used as an initiator for free radical polymerization reactions in the synthesis of polymer materials such as polystyrene and polymethyl methacrylate (PMMA). It has high triggering efficiency and can control the molecular weight distribution of polymers by adjusting reaction conditions. For example, in the synthesis of optical grade PMMA, initiators can achieve a molecular weight distribution index (PDI) below 1.2, meeting the requirements of high-end optical devices.

 

2. Organic reaction catalysts
Can be used as a Lewis acid catalyst to promote esterification, etherification, condensation and other reactions. For example, in the synthesis of the spice vanillin, the yield of its catalytic esterification reaction can reach over 95%, and the reaction conditions are mild (can be carried out at room temperature).

3. Functional material modification
Flour improver: Its derivatives can bind with proteins in flour, improve the rheological properties of dough, and enhance the volume and texture of bread. For example, adding 0.1% triphenylmethylation reagent in bread making can increase the volume of bread by 15% and make the texture softer.

 

Fiber decolorizer: It can undergo complexation reaction with pigment molecules in fibers to achieve decolorization effect. For example, in the cotton fiber bleaching process, its decolorization efficiency is 30% higher than traditional sodium hypochlorite, and it causes less damage to the fibers.
Rubber product exchange agent: Its derivatives can be used for exchange reactions in rubber vulcanization processes, improving vulcanization efficiency and enhancing rubber mechanical properties. For example, in tire manufacturing, adding 0.5% can increase rubber tensile strength by 20% and wear resistance by 15%.

Agriculture and Food: The Extension from Pesticides to Additives

 

1. Pesticide intermediates
Can be used as an intermediate for synthesizing herbicides, fungicides, and other pesticides. For example, its derivative Triphenylphosphine is a key raw material for the synthesis of herbicide glyphosate, which is efficiently synthesized through catalytic reactions.

2. Food additives
Although triphenylchloromethane itself cannot be directly used in food, its derivatives (such as triphenylmethylated starch) can be used as coatings for food packaging materials to enhance barrier properties. For example, in potato chip packaging, a triphenylmethylated starch coating can reduce oxygen permeability by 50% and extend shelf life.

Because triphenylmethyl chloride has a wide range of uses in organic chemical and pharmaceutical synthesis, a lot of research has been carried out on its synthesis at home and abroad. At present, the main methods for synthesizing triphenylmethane chloride are as follows:

C.R. Hauser et al. (Organic Syntheses, Coll.31955) reported the method of synthesis of triphenylmethane chloride from benzene and carbon tetrachloride by Friedel-Crafts reaction under the catalysis of aluminum trichloride. Add 2kg of benzene and 800g of carbon tetrachloride into a 5L three-necked flask with mechanical stirring, add 600g of aluminum trichloride in batches under the ice bath, after adding aluminum trichloride, continue the reaction for 2h, add the reaction solution into 1L of benzene and 2L6N of hydrochloric acid solution for hydrolysis, and then obtain 940g of triphenylmethane chloride through layering, concentration and recrystallization, with a yield of 75%. This method is a classic synthesis method of triphenylmethane chloride, but it has the disadvantages of large amount of three wastes and low yield.

C.R. Hauser et al. (Organic Syntheses, Coll. 31955) reported that triphenyl methyl chloride was produced by the reaction of triphenyl methanol with acetyl chloride. In a 1L round bottom flask with reflux condenser tube, add 250g of triphenyl methanol and 80ml of benzene, heat, and add 150ml of acetyl chloride in batches. After adding acetyl chloride, reflux for 30min, cool with ice bath, add 150ml of petroleum ether, filter, and dry to obtain 224g of triphenylmethane chloride, with a yield of 83%. This method has the disadvantage of high raw material cost.

Japanese patent JP63 ‑ 57540 reported a method of adding hydrogen chloride to the crude product of triphenyl methyl chloride to remove the impurity triphenyl methanol. Add 139.2g of crude triphenylmethane chloride and 164g of carbon tetrachloride into the reaction flask, heat it to 55 ℃, inject hydrogen chloride at the flow rate of 0.72Nl/h, after 3h, stop injecting hydrogen chloride, cool it to 5 ℃, precipitate and crystallize to obtain 103.2g of triphenylmethane chloride, with purity of 99.8%.

Another method for preparing triphenylmethyl chloride:

1. Dry thiophene-free benzene and carbon tetrachloride are mixed and cooled to 0-5 ℃, aluminum trichloride is added, and a large amount of hydrogen chloride gas is released during stirring reaction. The reactant is added to the precooled mixture of benzene and hydrochloric acid and hydrolyzed at 25 ℃. After the reaction, separate the benzene layer. Heat and evaporate benzene, cool to 40 ℃, add a little acetyl chloride, and heat and reflux for a moment. Cool, filter the mother liquor, wash the filter cake with petroleum ether and benzene once respectively, and dry it to obtain triphenylmethane chloride.

2. Add anhydrous aluminum trichloride to benzene without water and thiophene, mix well, add dry carbon tetrachloride in batches while stirring at 30~40 ℃, and then continue stirring until the reaction is no longer exothermic, the steam is kept at 70~80 ℃, and the mixture is returned until the hydrogen chloride escapes smoothly. Add 6mol/L of hydrochloric acid to benzene without water and thiophene, mix evenly, stir quickly, add the above mixture several times, and carry out hydrolysis reaction, control the hydrolysis temperature below 40 ℃. The benzene layer is separated, the water layer is diluted with ice water, and then extracted with benzene several times. The extraction solution is combined, dried with anhydrous calcium chloride, decolored with activated carbon, filtered and cooled to crystallize. Dissolve the crystal in the mixed solvent of benzene petroleum ether with a little chloroacetyl, and recrystallize to obtain purified triphenyl methyl chloride.

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