2-pyridinecarbonitrile, 5-fluoro-

The chemical properties of 2-% pentene-1-ol, 5-bromo-are as follows:
This substance contains carbon-carbon double bonds with hydroxyl and bromine atoms. The carbon-carbon double bond gives it the characteristics of addition reaction. It can be added with halogen elementals, such as bromine water, to fade the bromine water. During the reaction, bromine atoms are added to the carbon atoms at both ends of the double bond. It can be added with hydrogen under catalyst and heating conditions to form saturated alcohols, and this reaction changes the unsaturated structure of molecules.
Hydroxyl groups are active. It can react with active metals, such as sodium, to replace hydrogen and generate sodium alcohol, which reflects the activity of hydroxy hydrogen. Under concentrated sulfuric acid and heating conditions, an elimination reaction can occur. The hydroxyl group binds to the hydrogen atom on the adjacent carbon to form a water dehydration to form an unsaturated compound containing double bonds. This is one of the methods for preparing olefins. Esterification reactions can also occur. When catalyzed by concentrated sulfuric acid and heated by carboxylic acid, the hydroxyl group dehydrates and condensates with the carboxyl group to form esters and water. This reaction is used in organic synthesis to prepare ester compounds.
Bromine atoms also participate in many reactions. When heated in an aqueous sodium hydroxide solution, bromine atoms can be replaced by hydroxyl groups, and a substitution reaction occurs to form alcohols. This process changes the types of functional groups. In a sodium hydroxide alcohol solution and under heating conditions, an elimination reaction occurs. Bromine atoms combine with hydrogen atoms on the adjacent carbon to dehydrate, and at the same time form carbon-carbon double bonds, increasing molecular unsaturation. In conclusion, 2-% pentene-1-ol and 5-bromo-have rich chemical properties due to their various functional groups, and are widely used in organic synthesis and chemical industry. They can prepare different organic compounds through various reactions to construct complex organic molecular structures.

2-% to its direction, 5-5% of the people who often use the Tao, how general is the world. And the growth of plants, the direction of the world, is due to the light, and the plants need to grow. Where light comes, it can help photosynthesis, and the world can grow. Therefore, the world extends in many directions, wanting to obtain light and abundance, this nature is also.
As long as it is 5-5, its usual use of the Tao is the first to send. The pipe of the plant can be divided into water, and it can be divided from the root to the bottom. Water is the foundation of the life of the world, and the plants can live, and it can lead it, so that the branches and flowers can be spread. The water is the base of the life of the plant, and the plants can be brought to life. The water is absorbed by the root, or the photosynthesis is formed, and it is also used to supply the needs of each part.
Furthermore, there is the ability to support. The plant wants to stand in the heaven and earth, and its bones are broken. Plant,, can make the branches stretch and not wither. If it is weak, the branches are stiff, how can it be exposed to the light?
Also,
This is the direction of the world, and it is born by seeking light; 5-the use of the world, sending, supporting, replacing, and growing plants, all of which are essential. The wonders of life in this world cannot be ignored.

There are various methods for preparing di- dimethane methyl ether and penta-hydroxyl compounds.
One of the methods for the synthesis of di- di- dimethane ether and penta-hydroxyl can be obtained by etherification of the corresponding alcohols. First take a suitable alcohol and add a catalytic agent, such as sulfuric acid, to make it co-heat with etherification reagents such as halomethane. The halogen of halomethane is active, and when it encounters the hydroxyl group of the alcohol, the two interact in phase, dehalogenate hydrogen to form an ether bond, and then obtain di- dimethane. In this process, it is very important to control the temperature. If the temperature is too high or side reactions are caused, such as dehydration of alcohols to form alkenes.
As for the synthesis of pentacarbonyl, it can be started from aldol and ketone. The carbonyl of aldol and ketone is electrophilic. When encountering reagents with active hydrogen, such as Grignard reagents, the two are added to obtain alkoxides first, and then acidified to obtain hydroxyl groups. To obtain the structure of pentacarbonyl, an appropriate multi-carbonyl compound can be selected and reacted with Grignard reagents in sequence. Each molecule of Grignard reagents is added, and a hydroxyl group is increased. After several operations, the purpose can be achieved. However, attention should be paid to the dosage and reaction sequence of Grignard reagents in the reaction, otherwise it is easy to cause side reactions, such as ketones interacting with excessive Grignard reagents, or generating tertiary alcohols.
There is another method for the synthesis of dimethyl ether, which can be reacted with halogenated methane by phenols under basic conditions. Hydrogen of phenolic hydroxyl groups is acidic, and when it encounters bases, it forms phenolates. The oxygen anion of phenolic salts has strong nucleophilicity and can attack the carbon atom of halogenated methane to form ether bonds. This reaction condition is relatively mild, so it is necessary to choose a suitable base and solvent to promote the reaction. The synthesis of penta-hydroxyl can also be converted by oxidation or reduction of sugar substances. Sugars contain polyhydroxyl groups. After specific oxidation or reduction steps, the position and number of hydroxyl groups can be adjusted, or the compound of penta-hydroxyl can be obtained. And sugars have a wide range of sources and are affordable, making them a good choice for synthesis. However, carbohydrate reactions are complex and require fine regulation of reaction conditions to obtain the desired product.

I look at your question, and ask about the price range of 20% mutton and 50% river fresh in the market. The prices of the two are also different depending on the season, origin and quality.
Let's talk about mutton first. If 20% mutton is of ordinary quality, it may cost between 35 and 50 yuan per catty in the market. If the grass is fat in autumn and the mutton is fat, the price may be slightly reduced; and in the cold winter and twelfth lunar month, the demand increases sharply, and the price may increase slightly. And the origin is different, and the price is also different. Sheep in Saibei may be slightly higher than that in the mainland because of the lush aquatic plants and delicious meat.
As for 50% river fresh, there are many categories and the price varies. Common crucian carp and carp cost between 15 and 30 yuan per catty. If it is shrimp and crabs, the price will be higher. For example, the crab in the season, ointment full of yellow fertilizer, may reach 80 or even more than 100 yuan per catty. The price of shrimp varies depending on size and variety. Ordinary small shrimp cost about 40 yuan per catty, while sea shrimp cost more than 100 yuan per catty. And the price of the products produced by rivers, lakes and seas is also different. The fresh water in the lake may be slightly cheaper than the things in the river, but it also changes with time.
The price in the city is like a changing situation, often affected by the weather, geographical location, and supply and demand. Therefore, if you want to know the exact price, you need to go to the market in person and inquire in detail.

If you want to make dihydroxyl glycerin, you need to understand the method, and I would like to describe it as follows:
First, the choice of raw materials is very important. The production of glycerin often starts with oil. The oil is hidden in animal and plant bodies, and its nature is pure and high quality is better. If you choose vegetable oil, you need to choose fresh ones, which are free from rot and filth, so as to keep the purity of the product. If you use animal fat, you must also take clean and fresh ones, remove their impurities, and make the raw materials pure, which is the basis for making good glycerin.
Second, the reaction environment should be carefully observed. The reaction of glycerin production is often in the kettle, using alkali as a medium to promote the hydrolysis of oil and fat. The amount of alkali cannot be exceeded or lacking. If there is too much, the reaction will be too intense, which will damage the quality of glycerol; if there is too little, it will be difficult to hydrolyze completely, resulting in a low yield. During the reaction, temperature is also critical. If the temperature is high, it will be fast, but if it is too high, it will easily cause side reactions, making glycerin impure; if the temperature is low, it will be slow, time-consuming and laborious. Therefore, the temperature must be controlled to make the reaction go smoothly.
Furthermore, the art of separation should not be underestimated. After the reaction is completed, glycerin coexists with other things, and a method of separation must be applied to obtain a pure product. The method of distillation is often used to divide glycerin and residue by using the difference in boiling points. When distilling, the air pressure should also be paid attention to. The regular boiling point of the air pressure is accurate, and the glycerin can be separated smoothly; if the And the distillation vessel must be clean and dry to prevent impurities from mixing in and contaminating the quality of glycerol.
In addition, the process of refining is indispensable. The first glycerin, or containing slightly impurities, needs to be refined again. You can use adsorption methods to absorb its variegated odor with activated carbon; you can also use ion exchange techniques to remove its ionic impurities, so that the glycerin is pure and pure, and meets the required standards.
The glycerin of dihydroxyl production, from the selection of raw materials, to the control of reactions, the application of separation, and the completion of refining, all steps need to be cautious, and attention should be paid to all ends to obtain high-quality glycerol.