6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine dihydrochloride

6,7-Dioxo-5H-furano [3,4-b] furano and its dicarboxylic acid anhydride, is a kind of organic compound. The physical properties of this compound are as follows:
Looking at its appearance, under room temperature and pressure, or in the form of a white to light yellow crystalline powder, the shape may be smooth to the touch if it is delicate frost and snow.
When it comes to the melting point, it usually falls within a specific temperature range. This temperature is the critical temperature for the substance to melt from solid to liquid state, just like the moment when ice and snow melt, which is crucial for its identification and purity judgment. < Br >
In terms of boiling point, under specific pressure conditions, it has a corresponding boiling point value, which reflects the energy and conditions required for the substance to change from liquid to gaseous state, and is also a key characterization of its physical properties.
In terms of solubility, it may exhibit certain solubility in common organic solvents. In some organic solvents such as ethanol and acetone, there may be different degrees of dissolution, just like salt dissolves in water, or easily dissolves to form a uniform solution, or slightly dissolves and only partially dissolves. This property is closely related to the molecular structure and the properties of the solvent. < Br >
Density is also one of its important physical properties. Under a certain temperature and pressure, it has a specific density value. This value is like the weight of a substance, which can help to distinguish and understand the physical differences between it and other substances.
These physical properties are of great significance in many fields such as chemical industry, materials science, and drug research and development. In chemical synthesis, according to its melting point, boiling point, and other properties, reaction conditions can be optimized and product purity can be improved. In drug development, solubility and other properties are related to the absorption and efficacy of drugs. Just like building a tall building needs to be carefully designed according to the characteristics of the cornerstone, which is indispensable for the development of various fields.

To prepare 6-2,7-diketone-5H-furano [3,4-b] furano-dicarboxylic acid anhydride, the following paths can be considered.
First, take a suitable furan derivative, use a specific oxidant such as mild high-valent metal salts, in a suitable solvent, at a suitable temperature, make it oxidize, so that the substituent at a specific position on the furan ring is converted into a carbonyl group to construct a diketone structure. This process requires precise control of the reaction conditions. Due to the strength of the oxidant, the reaction temperature and time, the selectivity and yield of the reaction will be significantly affected.
Second, construct a furano-ring structure. Unsaturated esters containing appropriate substituents or compounds containing active double bonds and triple bonds can be selected, and furan derivatives containing diketone structures obtained in the early stage can be cyclized to form furano [3,4-b] furan structures under acid or base catalysis. The key to this step lies in the selection of catalysts and the regulation of the pH of the reaction system. If there is a slight deviation, other by-products may be formed.
Third, anhydride formation reaction. The obtained furano [3,4-b] furan dicarboxylic acid intermediate is heated and dehydrated in the presence of dehydrating agents such as acetic anhydride or phosphorus pentoxide to promote the conversion of carboxylic acids to acid anhydrides. In this process, attention should be paid to the reaction temperature and the amount of dehydrating agent. If the temperature is too high or the dehydrating agent is excessive, or it may cause an overreaction and destroy the target structure.
Each step of the reaction needs to be carefully treated, the reaction conditions should be carefully regulated, and the intermediate products should be properly separated and purified to obtain 6-2,7-diketone-5H-furano [3,4-b] furan and its dicarboxylic anhydride in a high yield.

6,7-Dioxide-5H-indolo [3,4-b] indolo-dicarboxylic anhydride, which is used in many fields such as medicine and materials.
In the field of medicine, it can be used as an intermediate for drug synthesis. Because the compound has a specific chemical structure and activity, it can be chemically modified to obtain derivatives with specific pharmacological activity. For example, in the development of anti-tumor drugs, by modifying its structure, drugs that can precisely act on specific targets of tumor cells can be prepared, and by interfering with the proliferation and invasion of tumor cells, the purpose of treating tumors can be achieved.
In the field of materials, 6,7-dioxide-5H-indolo [3,4-b] indolo-indolo-dicarboxylic anhydride can participate in the preparation of functional materials. Because its structure can endow materials with unique optoelectronic properties, in the field of organic optoelectronic materials, it may be used to manufacture organic Light Emitting Diodes (OLEDs), organic solar cells and other devices. After rational molecular design and material processing, it may improve the photoelectric conversion efficiency and stability of devices, providing assistance for the development of new energy and display technologies.
Furthermore, in the field of dyes, this compound may be developed into a new type of dye due to the chromophore in its structure. It may have good dyeing properties and color fastness, and can be used in textile, printing and dyeing industries to impart rich colors to fabrics and other materials.

What you are asking about is the market price of 6,7-dioxy-5H-furano [3,4-b] furano-dicarboxylic anhydride. However, these things are not covered in "Tiangong Kaiwu". The person who covered "Tiangong Kaiwu" was written by Song Yingxing in the Ming Dynasty. He recorded all kinds of processes and technologies, product sources, etc., which are often used in the industrial and agricultural industries of people's livelihood. For such fine chemicals, it was difficult to describe them before science and technology at that time.
Today, if you want to know the market price of this 6,7-dioxy-5H-furano [3,4-b] furano-dicarboxylic anhydride, it is appropriate to ask for it in the current chemical market. Market prices often vary due to factors such as quality, supply and demand, proximity to the place of origin, and difficulty in preparation. Or you can consult chemical raw material suppliers, who are familiar with the market and can tell you a more accurate price; you can also find relevant price information on chemical trading platforms and information websites, and comprehensively compare them to get the approximate price range. It is a pity that I cannot give you the exact price with the ancient method. I hope to follow today's approach to explore and get something.

The storage conditions of 6,7-dioxy-5H-furano [3,4-b] furano-dicarboxylic anhydride are related to the proper storage of this material, so as to maintain its stability and purity.
According to the discussion of "Tiangong Kaiwu", it is appropriate to store various materials in a normal and heavy environment. For 6,7-dioxy-5H-furano [3,4-b] furano-dicarboxylic anhydride, the first dry. Moisture is easy to cause its hydrolysis or other changes, so it should be placed in a dry place, avoiding wet places such as tidal places and watersides.
The second is low temperature. This compound is easy to decompose or cause structural variation when heated, so it should be stored in a cool and low temperature place. If there is a cool cellar, an ice chamber, etc., it is better to control its temperature to a suitable degree. However, it should not be too cold to prevent it from freezing and cracking or changing its crystal form.
In addition, it is also necessary to avoid light. Light can often cause photochemical reactions, which can damage its structure and properties. When stored in a dark container or wrapped object, keep it away from direct sunlight and strong light sources.
In addition, this object may be at risk of phase transformation with other substances, so it needs to be stored separately and cannot be co-located with reactive substances to prevent hybridization and damage to its quality. In this way, the quality of 6,7-dioxo-5H-furano [3,4-b] furan and its dicarboxylic anhydride can be preserved by keeping dry, low temperature, protected from light, and separate storage for later use.