pyridine, 4-chloro-3-nitro-, hydrochloride (1:1)

4-Mercapto-3-carboxyphenylpyruvate (1:1) is an organic compound with specific chemical properties. This compound contains a sulfhydryl group (-SH) and a carboxyl group (-COOH), which give it unique chemical activity.
The sulfhydryl group has high activity and is prone to oxidation reactions, which can form disulfide bonds. Under suitable oxidation conditions, the sulfhydryl groups of two 4-mercapto-3-carboxyphenylpyruvate molecules can be oxidized to form disulfide bonds. This process is crucial for the stability of protein structures in organisms and some enzyme catalysis mechanisms. In addition, sulfhydryl groups can coordinate with metal ions, which can be used for the detection or separation of heavy metal ions. Due to its strong affinity for some metal ions, stable complexes can be formed.
The carboxyl group is acidic, and hydrogen ions can be dissociated in aqueous solution, making the compound acidic. This property makes it able to neutralize with bases to form corresponding carboxylic salts and water. Moreover, the carboxyl group can participate in the esterification reaction and react with alcohols under acid catalysis to form ester compounds, which is a common method for constructing ester bonds in organic synthesis.
The structure of the benzene ring in 4-mercapto-3-carboxyphenylpyruvate acid (1:1) makes it stable and conjugated. The conjugate system of the benzene ring can affect the electronic distribution and spectral properties of the compound, and have an effect on its optical and electrical properties. And the benzene ring can undergo electrophilic substitution reaction, introduce other functional groups, and expand the chemical properties and application range of the compound.

4-Bromo-3-fluorobenzoylbenzoic acid (1:1) is a compound that has attracted much attention in the field of organic synthesis. It has many common uses and can be used as a key intermediate in the field of medicinal chemistry to help create a variety of drugs with specific pharmacological activities. For example, when developing targeted drugs for specific diseases, its unique molecular structure may be combined with specific targets of diseased cells, thus demonstrating good therapeutic effects.
In the field of materials science, it also has outstanding performance. Can participate in the preparation of materials with special optical and electrical properties. For example, in the synthesis of organic Light Emitting Diode (OLED) materials, the introduction of this compound structure may improve the luminous efficiency and stability of the material, thereby enhancing the performance of OLED devices.
Furthermore, in the field of pesticide chemistry, there is also a place. Or it can be chemically modified to produce pesticides that have high efficacy in killing specific pests, and because of the particularity of its structure, it may reduce the impact on the environment, in line with the current concept of green chemistry.
This compound has the potential to be widely used in different fields due to the unique properties of bromine, fluorine and other atoms in its structure. It is an indispensable and important raw material for the development of organic synthesis and related industries.

To prepare 4-bromo-3-nitrobenzoic acid (1:1), the synthesis method is as follows:
First, benzoic acid is used as the starting material, and its carboxyl group is the meta-localization group, which can be used to introduce nitro groups. The benzoic acid is placed in an appropriate amount of mixed acid (a mixture of concentrated sulfuric acid and concentrated nitric acid), and the nitration reaction is carried out at an appropriate temperature. In this reaction, concentrated sulfuric acid catalyzes and dehydrates, and concentrated nitric acid is the nitrifying agent. After careful temperature control and reaction process monitoring, the intersites of carboxyl groups on the benzoic acid benzene ring can be introduced into nitro groups to generate 3-nitrobenzoic acid. < Br > Then, for 3-nitrobenzoic acid, because both nitro and carboxyl groups are meta-localization groups, and the combined action of the two reduces the electron cloud density of the benzene ring, making the subsequent electrophilic substitution reaction more difficult. Therefore, it is necessary to choose brominating reagents with higher activity, such as the catalytic system composed of bromine and iron tribromide. Under suitable reaction conditions, bromine atoms are introduced into the benzene ring of 3-nitrobenzoic acid. Ferric tribromide reacts with bromine to form bromine cations, which attack the 3-nitrobenzoic acid benzene ring as an electrophilic reagent. Due to the co-localization effect of carboxyl and nitro groups, bromine atoms are mainly substituted at the ortho-position of carboxyl and nitro groups (one of which is the target 4-position) to obtain 4-bromo-3-nitrobenzoic acid. The whole process requires precise control of the reaction conditions, such as temperature, reagent dosage, reaction time, etc., to achieve the product ratio of 1:1.

4-Hydroxy-3-methoxyphenylacetic acid (1:1) There are several matters to be taken into account when storing and transporting.
First, this compound is quite sensitive to environmental factors. In terms of temperature, it should be stored in a cool place to avoid high temperature. Due to high temperature or changes in its properties, it may even cause chemical reactions to cause deterioration. For example, if there is a high temperature in summer, if there is no proper temperature control policy, it may damage its quality. Humidity should also be paid attention to. It should be placed in a dry place to prevent moisture from attacking. Humid environment may cause it to deliquescent, which will affect purity and stability.
Second, when transporting, the packaging must be tight. Appropriate packaging materials should be used to ensure good sealing to prevent leakage. If it leaks, it will not only deface other goods, but also cause safety hazards due to the characteristics of the compound. And vibration during transportation should also be considered, and shock absorption measures should be taken to prevent it from damaging the package due to vibration and collision and causing leakage.
Third, the choice of storage place is also critical. It should be kept away from fire sources, oxidants, etc. This compound has specific chemical properties, and it may cause fire or explosion in case of open flame, oxidant, etc. Therefore, the storage place must be well ventilated to reduce the risk of harmful gas accumulation.
Fourth, during the entire storage and transportation process, relevant personnel should be familiar with the characteristics of the compound and emergency disposal methods. In the event of an accident such as a leak or fire, we can respond promptly and appropriately to minimize the harm.

The market price of 4-deuterium-3-fluorobenzoylbenzoic acid (1:1) is difficult to sum up. The price of this compound often varies due to many factors.
The difficulty of obtaining its raw materials is one of the key factors. If the raw materials are rare or difficult to extract, the cost will rise, and the price will also rise. For example, the acquisition of deuterium and fluorine, if resources are scarce, and complicated processes are required to refine, the cost will increase greatly, which will affect the price of this compound.
The complexity of the preparation process also affects its price. If the preparation process requires exquisite equipment, strict conditions, and complicated steps, the required manpower, material resources, and financial resources are huge, and the price should be expensive. If the maintenance of specific reaction conditions and the use of high-precision instruments all increase costs.
The state of supply and demand in the market is also an important influence. If the market demand for this compound is strong and the supply is limited, according to economic common sense, the price will increase. On the contrary, if there is little demand and excess supply, the price will inevitably decline.
In addition, the scale and efficiency of the manufacturer are also related to the price. Large factories may be able to reduce costs by virtue of economies of scale, and their prices may be more competitive; while small factories may be relatively high due to scale restrictions.
Overall, the market price of 4-deuterium-3-fluorobenzoylbenzoic acid (1:1) can range from a few hundred yuan per gram to thousands of yuan per gram, or even higher, depending on the specific circumstances of the above factors.