1,4-Dioxaspiro[4.5]Decane-2-Methanol

"Heavenly Works" is a masterpiece of science and technology written by Song Yuxing in the Ming Dynasty. It is a work of multi-engineering technology and material use. Today, "the use of acetylene" is described in ancient Chinese. Acetylene is also an important raw material. Its sexual activity and purpose. First, in the matter of smelting, acetylene can be the source of power. Because of its combustion, it can put a huge amount of gold, which can make the metal melt quickly, so it is often welded and cut. With acetylene flame, gold is like wosher, which can be shaped according to human wishes, repaired equipment, or built new equipment. Second, in the field of chemical industry, acetylene is also an important raw material. It can be used in many ways and can be used in reverse. Such as synthetic rubber, plastics, etc., this material has a wide range of uses in the world, ranging from ship equipment to daily utensils. Acetylene is indispensable in its synthesis process. Third, in terms of lighting, acetylene used to be used as a light source in the past. In specific utensils, acetylene emits bright light, which is now replaced by multiple lighting devices. However, in the past, the light of acetylene used to illuminate the dark night, providing convenience to people's lives and work. Of course, acetylene is used for micro-things, but its use is wide. It is also an important material in many fields such as engineering and chemical industry. It is also an indispensable material for the world.

"Tiangong Kaiwu" is an ancient scientific and technological masterpiece of our country. Today, the "physical properties of ethane" are described in the format of ancient Chinese proverbs as follows: Ethane is a colorless and odorless gas at room temperature and pressure. Its density is slightly lighter than that of air, about 0.55 times that of air. Because its density is less than that of air, if ethane escapes in the atmosphere, it will slowly float up. The boiling point of ethane is -88.6 ° C, which is very low. This property makes ethane very easy to vaporize at room temperature, and it is easy to turn into a liquid state if the ambient temperature drops slightly. Its melting point is about -183.3 ° C. When the temperature drops to that, ethane will solidify into a solid state. Ethane is slightly soluble in water, but it can dissolve with many organic solvents, such as ethanol, ether, etc. This difference in solubility is due to the difference in the molecular structure of ethane and the interaction between water molecules and organic solvent molecules. Ethane is relatively stable in chemical properties, and it is not easy to react with common substances under normal conditions. However, in specific environments, such as high temperature, high pressure or the presence of catalysts, ethane can also exhibit active chemical properties and participate in various chemical reactions. In summary, ethane has physical properties such as colorless and odorless, light density, low boiling point, and slight solubility in water, which lay the foundation for its many applications in the chemical industry.

The properties of ethane are quite interesting to observe, and it should be discussed in detail today. Ethane is a genus of alkanes, and its molecular formula is\ (C_ {2} H_ {6}\). Under normal conditions, ethane is gaseous, colorless and has a weak hydrocarbon odor. Its boiling point is about -88.6 ° C and its melting point is about -183.3 ° C. These physical properties make it difficult for ethane to remain in the liquid or solid state at room temperature and pressure. In terms of its chemical properties, ethane has typical alkane properties. First, it has considerable stability. Under normal conditions, ethane is difficult to react with strong acids, strong bases and strong oxidants. Due to the high energy of the carbon-carbon single bond (\ (C-C\)) and carbon-hydrogen bond (\ (C-H\)) of ethane, the structure is stable. However, under certain conditions, ethane can also exhibit an active state. If ignited in sufficient oxygen, ethane can burn violently, generating carbon dioxide and water, while releasing a large amount of heat energy. The reaction equation is:\ (2C_ {2} H_ {6} + 7O_ {2}\ stackrel {ignited }{=\!=\!=} 4CO_ {2} + 6H_ {2} O\), which is the basis for the application of ethane as a fuel. Furthermore, ethane can undergo a substitution reaction. When ethane and chlorine meet under light conditions, chlorine atoms can gradually replace hydrogen atoms in ethane molecules to generate chloroethane, dichloroethane and other chlorinated hydrocarbons. This reaction process is complex, and each step is a free radical reaction mechanism. For example, the first step of the reaction is:\ (C_ {2} H_ {6} + Cl_ {2}\ stackrel {light }{=\!=\!=} C_ {2} H_ {5} Cl + HCl\). In summary, the chemical properties of ethane not only contain stability, but also can participate in combustion and substitution reactions under specific circumstances. This unique property makes it important and widely used in both the chemical industry and the energy industry.

Acetyl caffeine, and heroin, are drugs. The law involves many methods and methods, but it shows its harm, and describes the illegal laws of the past, which are a warning and cannot be followed. First, start with caffeine. Take the acid of caffeine and dissolve it in a certain amount, such as ether. And then, add acetic anhydride, and add it with sulfuric acid catalysis. Under specific conditions and conditions, it is made to react biochemically. It is the interaction between the base of caffeine and the ethyl group of acetic anhydride, and then forms acetyl caffeine. After the reaction, wash it with a solution of carbonated acid, remove the caffeine, and then steam it, crystals, etc., to obtain the crystal of acetyl caffeine. Second, there are also those based on tablets. First, the tablets are extracted from lime water and other methods to extract coarse caffeine. However, according to the above-mentioned method of caffeine and acetyl caffeine, add acetic anhydride and sulfuric acid, and reverse caffeine and extract caffeine, you can also get acetyl caffeine. However, this method is all evil. Acetyl caffeine is very toxic, and it is poisonous to the body, the spirit, the family, and the order of the society. In today's world, every law is prohibited, and it is a serious crime to use it. We understand its harm, and avoid it, so that we can achieve peace and health in the world together.

"On the Safety of Nitrite" Nitrite is always present in fireworks and pickled things. Its liveliness is lively, and it is used in the field of diet and various chemical industries. Improper use of it will cause serious harm, which is related to the safety of life, and cannot be ignored. First, the amount of nitrite must be accurate. In pickled foods, if you add too much, it can be anti-corrosive and enhance color, but it enters the body and is easy to transfer nitrosamine, which is a strong carcinogen. Therefore, in the home of cooking, when pickling, the amount should be recorded in the ordinances, and it should not be different. The "Food Sutra" says: "The adjustment of things, the amount is necessary, and the investment of nitrite should not exceed the moment." This is also called. Second, the storage of nitrite is suitable for a cool and dry place, and it must be separated from other things. Its nature is strong, and if it coexists with flammable and strongly oxidized substances, it will be hot and hit, and it will cause explosion. In the past, there were workshops that did not follow this rule, causing people to die from fire, and the situation is unspeakable. Those who are warehoused should remember the lesson of "keep nitrite, avoid heat and avoid complexity". Third, those who use nitrite must understand the law. In the field of industry, those who operate must wear protective gear, such as gloves, masks, etc., to prevent it from touching the body, entering the eyes, and inhaling the lungs. And when using the later utensils, be careful to wash the places carefully, and do not let the residual nitrite stain other things. The "Work Code" says: "Use nitrate in business, and protection should be taken first, and the aftermath should not be taken lightly." Although nitrite is available in various karma, its safety is a matter of life and death. Users and depositors should abide by the rules to ensure safety. Do not regret for a lifetime because of a temporary convenience.