Pyridine, 4-methoxy-2,3-dimethyl- (9CI)

This compound is called "spiritual sand".
Spiritual sand is the most important thing in the Dan family. "Tiangong Kaiwu" states: "Mercury and even the essence of yin have the nature of calmness. If you get ordinary fire to exercise, you will soar and become spiritual; if you get popular fumigation, you will drill tendons into the bones, and the sun will eat the brain. Its nature is afraid of leather, so it penetrates through the leather. If cinnabar is the end, and it is studied with mercury, it will be intertwined into sand, which is called spiritual sand." This name is derived from the symmetry of cinnabar and mercury.
Cinnabar, originally dansha, is red in color, slightly cold in nature, non-toxic, dominates the five internal organs and diseases of the body, nourishes the spirit, calms the soul, nourishes qi and eyesight, kills the essence and charms evil ghosts, and has been served for a long time. Mercury, also known as mercury, is a liquid metal, cold in nature, poisonous, can kill insects, eliminate scabies, abort, remove heat, and kill gold, silver, copper, and tin poison. The sympathies between the two are combined into spiritual sand, which has the properties of both, and the toxicity is slightly reduced.
The use of spiritual sand, ancient people used it to refine alchemy for longevity. However, its toxicity still exists, and it cannot be taken rashly. Later physicians also used it as medicine, and took its effect of calming the mind to treat heart palpitations and insomnia. However, it is necessary to use it with caution, apply the medicine according to the symptoms, and measure it appropriately to prevent poisoning.

The physical properties of this compound are as follows:
Its color is either solid, liquid, or liquid, or liquid, which depends on the creation of its molecules and the molecular force. If the molecular force is weak, such as the presence of molecules, particles, etc., it is often solid; if the molecular force is slightly weaker, it may be liquid; and the molecular force is weak, so it is difficult.
Its melting boiling is one of the important physical properties. For small molecules and the molecular force is weak, the melting boiling is low. For example, some of the, because of its weak Fande Wall force, so the melting is low. On the contrary, compounds containing alcohol, such as alcohols, carboxylic acids, etc., have a high melting and boiling phase. Due to the high energy required to break down molecules, the solubility of
should not be ignored. According to the principle of "similar phase solubility", the soluble compounds are easily soluble in water, and the non-soluble compounds are easily soluble in non-soluble. For example, food (chemical compounds, chemical compounds) are soluble in water (chemical soluble), while oils (non-chemical compounds) are soluble in gasoline (non-chemical soluble). In terms of density, the density of different compounds varies. Generally speaking, the density of solid and liquid compounds is higher than that of liquid compounds. And in liquid compounds, the density of phase molecules is often higher when the amount of molecules is large. However, there are also special cases, such as the mixing of water and ethanol. Due to the interaction of molecules, the density of the two compounds is different.
In addition, the compound may have a specific refractive index, which can be used to determine the degree of refraction of the compound. Light passes through the compound, and its degree of refraction depends on the properties of the compound. And the properties of the compound are also important. Physical properties are also important. Subcompounds are often effective in melt or aqueous solution, but multi-compound compounds are not effective unless they are produced under specific conditions.

This compound is complex in nature, let me tell you about it. This compound has unique physical and chemical properties.
It is at room temperature, or in a solid state, with a hard texture, like gold and stone, with a calm color, or a dark color, with a metallic luster, and cold tentacles, like cold jade. When it is roasted by fire, to a specific high temperature, it is like ice and snow when it meets the warm sun, and gradually melts into a flowing state, hot and sticky like magma.
As for its chemical properties, it is particularly lively. When it encounters strong acid, it is like a flood dragon entering the water, instantly churning and reacting, hissing, like thunder and anger, releasing pungent gas, which permeates the air and chokes the eyes and noses. If placed in a strong alkali environment, it does not show weakness, and it confronts it fiercely, causing wonderful chemical changes and generating different substances.
And the compound will quietly embrace oxygen in the air, slowly oxidizing, the surface is covered with tulle, the color is gradually changed, from bright to dark, like something eroded by time. In case of water, it also has different performance, or it fuses with water, slowly undergoes hydrolysis reaction, generates new ions and molecules, and changes the surrounding chemical environment. With the help of specific catalysts, it can participate in a variety of complex organic reactions, just like a highly skilled dancer, dancing on the stage of chemistry, interweaving and fusing with other substances, generating many unexpected new compounds. The changes are amazing and breathtaking.

This compound has a wide range of uses and is important in various fields.
In the field of medicine, the compound is the basis for making good medicines. Doctors use various compounds to make medicines for various diseases according to precise formulas and processes. For example, antipyretic and analgesic agents use specific compound ingredients to relieve pain, reduce body temperature, and reduce the pain of patients. There are anti-infection drugs. With the unique nature of the compound, they inhibit and kill bacteria and protect human health.
In agriculture, compound substances are also indispensable. Fertilizers, containing nitrogen, phosphorus, potassium and other elements, are applied to the field to fertilize the soil, promote crop growth and increase its yield. Pesticides are also the products of chemical compounds, which can remove pests, prevent diseases, and ensure the prosperity of crops, so that all people can enjoy abundant food.
In the industrial field, chemical compounds are widely used. In the chemical industry, basic chemical materials are used to produce plastics, rubber, fibers and other materials through complex reactions. Plastics are light and durable, and are used in all aspects of life, such as appliances, packaging, etc.; rubber has good elasticity and wear resistance, which is required for tires, seals, etc.; fibers can be woven into clothing fabrics to meet people's clothing needs. In the field of energy, chemical compounds participate in battery manufacturing, and various compounds in lithium-ion batteries cooperate to store and release electrical energy, supply energy for mobile devices and electric vehicles, and promote the development of science and technology.
In daily homes, chemical compounds can also be seen everywhere. In cleaning products, detergents, disinfectants, etc. are the results of chemical synthesis. Detergents can remove stains and make clothes clean; disinfectants can kill germs and ensure the hygiene of the home environment. In addition, coatings are also chemical products, applied to walls and furniture, with dual functions of decoration and protection.
Compounds play a key role in medicine, agriculture, industry, household and many other aspects, greatly affecting people's lives and social progress.

There are many synthetic methods of a chemical compound, and they are selected to be described.
One is the method of addition reaction. Such as alkyne, with unsaturated bonds, it can be added with various reagents. Taking ethylene as an example, when encountering carbon tetrachloride solution of bromine, one bond in the ethylene double bond breaks, and the bromine atom is added to the two carbon atoms to form 1,2-dibromoethane. This reaction condition is smooth and the yield is quite high. It is often an important path for the synthesis of halogenated hydrocarbons. And under an appropriate catalyst, ethylene can also be added with water to obtain ethanol, which is one of the methods for industrial alcohol production.
The second is the method of substitution reaction. For example, the halogenated hydrocarbon reacts with sodium alcohol, and the halogen atom is replaced by an alkoxy group to form an ether compound. Taking chloroethane and sodium ethanol as an example, the two react to form ether and sodium chloride. Or the substitution of aromatic hydrocarbons, benzene reacts with bromine under the catalysis of iron, and bromine atoms replace the hydrogen on the benzene ring to obtain bromobenzene. This is a common method for synthesizing aromatic halogens.
The third is the method of redox reaction. The aldehyde can be oxidized to a carboxylic acid. Taking acetaldehyde as an example, under the action of an appropriate oxidizing agent such as Torun reagent or Feilin reagent, the aldehyde group is oxidized to a carboxyl group to obtain acetic acid. Conversely, the carboxylic acid can be reduced to an alcohol by reduction means, such as glycol.
The fourth is the method of condensation reaction. Such as the hydroxyl-aldehyde condensation of aldol and ketone, two molecules of acetaldehyde under the action of dilute base, the addition of α-hydrogen of one molecule of acetaldehyde and the carbonyl of another molecule of acetaldehyde to obtain 3-hydroxybutyraldehyde, which is heated and dehydrated to form 2-butylenaldehyde. This reaction can grow the carbon chain and is of great significance in organic synthesis. Another example is the esterification reaction, which is also a condensation reaction. Alcohol and carboxylic acid are catalyzed by concentrated sulfuric acid to remove one molecule of water to form esters. For example, ethanol reacts with acetic acid to obtain ethyl acetate, which is a common preparation method for fragrances and organic synthesis intermediates.