(+,-)-8,9-Difluoro-5-methyl-6,7-dihydro-1-OXO-1H,5H-benzo[I,J]quinoline-2-carboxylic acid

It is also an important question in the field of chemistry. The chemical name of the acid is 12-hydroxy-9-octadecenoic acid. Looking at its structure, it has the shape of a long-chain fatty acid. With a carboxyl group (-COOH) at one end, this is the mark of a carboxylic acid, which makes it acidic and can neutralize with bases.
The carbon-carbon double bond (C = C) in the chain, between the 9 and 10 carbons, this double bond gives it unsaturation and can participate in addition reactions, such as with hydrogen and halogens. Especially unique, there is a hydroxyl group (-OH) attached to the 12-position carbon, which adds its special chemical activity, which not only affects the polarity of the molecule, but also allows the acid to participate in esterification, dehydration and other reactions.
From the overall chemical structure, the coexistence of this hydroxyl group and double bond makes the acid complex and versatile. It plays an important role in many fields such as oil chemistry and drug synthesis. Due to the synergistic effect of various functional groups in the structure, the acid and its derivatives can be used as lubricants, plasticizers, pharmaceutical intermediates, etc., and are indeed a key compound in the chemical world.

"Tiangong Kaiwu" says: "Seven vinegars, with wine as a spice, placed in urns, exposed to the sun and night dew, over the years, wine and vinegar. Its physical properties, color or clear yellow, sour and strong taste, pungent taste, liquid at room temperature, soluble with water.
The color of husband vinegar, its color, common ones are clear yellow like amber, and there are dark brown near ink, all due to brewing methods and raw materials. Looking at its color, clear yellow ones are clear and translucent, dark brown ones are mellow and dignified, all have their own states.
As for its taste, acid is its origin, strong and piercing, the first taste, the sour feeling suddenly arises, straight through the mouth and nose, making people's body fluids surge. And it has a pungent taste, smell it, sour gas punches the nose, refreshing and pungent.
At room temperature, vinegar is a liquid, with a flowing texture, it will spill when poured, and it will be full when it enters the cup, amorphous and shaped with the vessel. In addition, vinegar can be miscible with water, no matter what proportion it is mixed, it can be fused into one, without the appearance of layering, just like fish and water blending, which is also its unique nature.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, and the book has detailed records on the uses of many substances. Today, the question of "What is the use of 2-boric acid?" is said in ancient Chinese:
Boric acid is widely used. In metallurgical techniques, it can be used as a melting agent. When casting metallurgical iron, boric acid is added to it, the molten liquid of metal is easier to flow, impurities are also easy to separate, and the cast utensils are more pure.
In the way of medicine, boric acid has the ability to disinfect and prevent corrosion. It can be made into a medicine to prevent evil poison from entering the body and help the wound heal. It can also be used as an eye medicine to clear the eyes and remove the shade, so that the eyes are clear and moist.
In the ceramic firing industry, boric acid can be used as a raw material for glaze medicine. Adding it to the glaze can reduce the melting point of the glaze, make the glaze smooth and bright, and increase its hardness and wear resistance. The resulting ceramics are beautiful and durable.
In the printing and dyeing industry, boric acid can be used as a mordant. The auxiliary dye is closely combined with the fabric. When dyeing, the color is easier to adhere and last, and it is not easy to fade. The dyed fabric is bright and firm.
It can be seen that the use of boric acid has its own merits in various industries, and it is an indispensable substance.

To prepare phthalic acid, there are three methods.
First, take （+， -） - 8,9-dihydro-5-methyl-6,7-dihydroxy-1-oxo-1H, 5H-phenyl [I, J] furan as raw materials, and obtain phthalic acid by light reaction. This reaction requires specific lighting conditions, and the operation needs to precisely control the duration and intensity of the light to obtain a higher yield.
Second, it can be converted from the corresponding benzene-containing ring compound through a multi-step reaction. First, a specific substitution of the benzene ring is carried out, and a suitable functional group is introduced, and then the functional group is converted into a carboxyl group through an oxidation reaction, thereby preparing phthalic acid. In this process, the substitution reaction requires the selection of appropriate reagents and reaction conditions to ensure the accurate substitution position; the oxidation step requires strict control of the amount of oxidant and reaction temperature to avoid excessive oxidation.
Third, starting from other aromatic compounds, it is synthesized through a series of functional group transformation and cyclization reactions. First, the starting compound is modified to construct a suitable carbon skeleton and functional group distribution, then cyclized to form a phenyl ring structure, and finally the carboxyl group is introduced through oxidation and other steps. This path requires careful design of the reaction sequence and conditions, and the reactions in each step are closely related. Any one-step deviation may affect the final product. < Br >
The methods for preparing o-benzoic acid have their own advantages and disadvantages. In practical application, the selection needs to be weighed according to many factors such as raw material availability, cost, yield and product purity.

"Tiangong Kaiwu" said: "（+， -） - 8,9-diene-5-methyl-6,7-dialdehyde-1-oxo-1H, 5H-indeno [I, J] pyrene-2-carboxylic acid What is the market prospect?"
This product has its uses in various fields such as chemical industry and medicine in this world. Chemists can use it as raw materials to make various fine chemicals, which can help improve the process and improve the efficiency. In medicine, it may become the basis for the research and development of new drugs, and find new opportunities for treating diseases and diseases.
Looking at its market prospects, opportunities and challenges coexist. Opportunity, today's technology is advancing, the demand is diverse, and the search for new materials and new drugs is endless. If the characteristics of this product are specific, it can solve the problems of the industry, and it is urgently needed by the market, it will be favored, the market will open up, and the industry will thrive.
Challenges should not be underestimated. First, the synthesis process is very complex, and the cost remains high. If you can't find a simple way to reduce the cost, it may be difficult to compete with similar competitors. Second, the impact of this product on the environment and the human body needs to be explored in detail. If there is potential harm, the road to compliance is difficult, and marketing activities are also blocked. Third, the market is changing, and competing products are emerging in an endless stream. It is necessary to have keen insight and innovate in order to take the lead.
In summary ，（+， -） - 8,9-diene-5-methyl-6,7-dialdehyde-1-oxo-1H, 5H-indeno [I, J] pyrene-2-carboxylic acid The market prospect depends on the ability of process optimization, security evaluation and market strain. If you do it well, you will be able to get a place in the market.