3-pyridinemethanol

In the era mentioned in "Tiangong Kaiwu", silk reeling by silkworms was an extremely important business. Mulberry tree cultivation, especially female mulberry, was important. Its main use involves many aspects.
The first to promote silk production. The mulberry leaves of the female mulberry tree are high-quality food for silkworms. Only by eating the leaves of the female mulberry can it grow healthily and spin silk cocoons smoothly. High-quality mulberry leaves can raise silk cocoons. Silk was of great significance to the social economy and people's livelihood at that time. At the economic level, silk fabrics were important commodities. They were sold to foreign countries through the Silk Road, earning a lot of wealth for the country and being a key material for foreign trade. Silk weaving was also widely carried out among the people, and many families depended on it for a living, forming a huge industry and promoting economic operation.
Furthermore, the female mulberry also has a place in the field of traditional medicine. Its leaves, fruits, skin, etc. can be used as medicine. Mulberry leaves have the effect of evacuating wind heat, clearing the lungs and moisturizing dryness, clearing the liver and eyesight, and can treat wind-heat colds, lung heat and dry cough. Mulberry, that is, mulberry, can nourish yin and blood, generate fluid and moisturize dryness, and is beneficial to liver and kidney yin deficiency, vertigo and tinnitus, etc. Mulberry skin can relieve lung asthma, improve water and reduce swelling, and is used for pulmonary heat asthma and cough, edema and swelling, etc.
In addition, the female mulberry wood is solid and fine-grained, which can be used to make various utensils. For example, to create exquisite furniture, its texture is excellent, durable and beautiful; it can also be used to make small handicrafts, which can be carved by craftsmen into exquisite objects and add elegance to life.
The female mulberry played a key role in the fields of agriculture, economy, medicine and handicraft at that time, and made outstanding contributions to social stability and development.

3- The physical reason of his armor is like that of the old saying.

He likes his armor and is afraid of cold, and is mostly nurtured in warm rooms. It is soft and slippery, its color is white like snow, and it is small in size, and it is shaped like a creeping baby. It is soft and slippery, and its color is white like snow. It is small in size, and it is shaped like a creeping baby. It can be used to refer to it, to feel its tenderness, to move it, to creep it, and to flex and extend it in an orderly manner.
It eats mulberry and is raw, and the taste of mulberry is what it is addicted to. Eat mulberry, chewing the mouthparts, rustling and sand. The division of mulberry, its digestion, and its own energy to help it grow.
It can be turned into silk, it can be turned into silk, it is thin and thin, and it feels slippery, and the color is smooth, and it can be used for a long time without breaking.
It can be turned into silk, it can be turned into silk, it is thin and thin, and it feels slippery, and it can be used for a long time.
It can be used for a long time, and it can be used for a long time.
It can be used for a long time.
It can be used for a long time. With the hand, it can feel hard and hard, and it can be used for a long time.
Wait for the moth to break out, the moth is powdered, the wingspan is 6 inches, and the color is 6 inches or white. The moth is weak and weak, and its ability to move is not good, so it mostly lingers nearby. However, the importance of its reproduction, the male and female are intertwined, and the eggs are replaced by eggs. The eggs are as small as a millet, and the color is light, and the first time is small. It is still hard and hard, and the hope of breeding new life is in it. This is the reason for its physical reason.

3-Alkyl methyl ether is a class of organic compounds. Its chemical properties have various characteristics, as detailed below:
First, physical, normal temperature state, 3-Alkyl methyl ether is mostly liquid, but it also varies depending on the structure and size of the molecule. Its boiling point is related to the relative molecular weight and intermolecular forces. If the molecular weight is large and the force is strong, the boiling point will be high; otherwise, it will be low. And the solubility of such compounds in water is limited. Because its molecules are non-polar to a certain extent, they interact weakly with the polar molecules of water, but in organic solvents such as ethanol and ether, the solubility is quite good, because of the "similar miscibility" principle.
As for the chemical properties, the ether bond (C-O-C) is the key structure in the 3-alkyl-methyl ether. Although the ether bond is relatively stable, it can also react under certain conditions. First, when encountering strong acids such as hydroiodic acid (HI), the ether bond can be broken. Iodine ions in hydroiodic acid have strong nucleophilicity and attack the carbon atoms of the ether bond, causing the ether bond to break, resulting in the formation of corresponding iodoalkanes and alcohols. If there is excess hydroiodic acid, the alcohol can further react to iodoalkanes. Second, 3-alkyl-methyl ether can participate in free radical reactions. In the presence of light or peroxide, the alkyl moiety can form free radicals, thereby triggering a series of free radical substitution or addition reactions. Third, due to the presence of alkoxy groups, it can produce a certain electronic effect on the hydrogen on the carbon connected to it, which affects the reactivity of other parts of the molecule.
The chemical properties of 3-alkyl and its methyl ether include not only the characteristics of relatively stable ether bonds, but also the reactivity that can be actively exhibited under specific conditions. It has important application value in many fields such as organic synthesis.

3-Pentanone, also known as methyl propyl ketone, has many synthesis methods, which are described in detail below.
First, n-butyric acid and ethanol are used as raw materials, and esterification reactions occur under the action of catalysts to form ethyl butyrate. After ethyl butyrate is reduced and condensed under the action of reducing agents such as sodium metal, 3-pentanone can be obtained. In this process, n-butyric acid and ethanol are esterified under the catalysis of concentrated sulfuric acid and heating conditions to form ethyl butyrate and water; ethyl butyrate is reduced and condensed in the environment of sodium metal and excess ethanol, and the two-molecule ethyl butyrate intercarbonyl reacts with α-hydrogen to eventually generate 3-pentanone and sodium ethanol.
Second, with 1-pentene as the starting material, the addition reaction occurs with water under the action of acid catalyst to generate 2-pentanol. 2-pentanol is oxidized to 3-pentanone under the action of a suitable oxidant such as potassium dichromate acid solution. When 1-pentene is added to water, following the Markov rule, hydrogen atoms are added to the double-bonded carbon atoms containing more hydrogen; 2-pentanol is oxidized by potassium dichromate acid solution, and the hydroxyl group is oxidized to carbonyl to obtain 3-pentanone. < Br >
Third, using diethyl malonate and bromoethane as raw materials, the methylene of diethyl malonate and bromoethane underwent a substitution reaction under the action of sodium ethanol. After hydrolysis and decarboxylation, 3-pentanone can be obtained. Among them, sodium ethanol captures the methylene hydrogen atom of diethyl malonate to form a carbon negative ion, which attacks bromoethane for substitution; subsequent hydrolysis changes the ester group to a carboxyl group, and heating decarboxylates to generate 3-pentanone.
Fourth, ethyl acetoacetate and bromoethane are used as raw materials, similar to the above-mentioned diethyl malonate method. Under the action of sodium ethyl alcohol, ethylene acetoacetate is substituted with bromoethane, and then hydrolyzed and decarboxylated to form 3-pentanone. Methylene in ethyl acetoacetate is affected by two carbonyl groups, and the hydrogen atom is acidic to a certain extent. After sodium ethyl alcohol captures hydrogen, it forms a carbon negative ion and reacts with bromoethane; after hydrolysis and decarboxylation, the target product is 3-pentanone.

Hidden and transported, in the matter of masonry, are all important and must be paid attention to.
Tibetans, the first priority is to place their own land. It is advisable to choose a high and dry place to avoid a humid place. If it is humid, water vapor will easily invade, and the stone will be perishable, causing it to lose its strength. And the hidden place should be sheltered from the wind, and the wind will erode for a long time, and the culture of the stone will also be damaged. The place where the stone is hidden needs to be stable, and there should be no danger of collapse, otherwise the stone will be destroyed in one fell swoop and all previous efforts will be lost.
Furthermore, when storing stones, the arrangement should also be exquisite. It should not be piled up in a messy manner, and it should be arranged in an orderly manner according to the size, shape, and texture of the stones. In this way, one is easy to use
As for transporting stones, you must first measure their weight. Heavy stones are difficult to carry, so you must prepare suitable equipment. If the tool is not suitable and strong, there is a risk of falling, hurting people and damaging the stone. And the road of transporting stones should be smooth without obstacles. If the road is rough and the stone is bumpy on the way, it is easy to crack and damage its quality.
When transporting stones, the protection should not be ignored. Pad with soft objects to avoid direct friction between the stone and the object being carried. When encountering a turning point, you should especially be careful to walk slowly to prevent the stone from falling out of balance.
And, whether it is hiding or transporting, you need to check the sky. When it is hot, the stone body expands, and it is easy to break when it is transported; when it is cold, the stone nature becomes brittle and easily damaged. Therefore, it is advisable to choose a mild time to do it, so as to preserve the integrity of the stone.
All these are important in the storage and transportation of the stone. Those who act should pay attention carefully, so that they can get all the work and not leave behind.