2-Cyclopropylimidazole

"Tiangong Kaiwu" contains camphor, also known as Shao'er, which originated in Shaozhou and Zhangzhou. Its main uses are three:
First, it is used in medicine. Camphor is warm, fragrant, and has the functions of clearing the orifices, promoting stagnation, removing filth and turbidity, killing insects and relieving itching, reducing swelling and pain. In ancient times, it was often used as medicine to treat heart and abdominal distension and pain, athlete's foot, sores and scabies and other diseases. In case of acute cases of swelling and abdominal pain, vomiting, diarrhea and dizziness, it can be taken at the end of camphor research to open the orifices and wake up the mind; applied externally, it can stop skin itching, reduce swelling and relieve pain.
Second, it is used for antisepsis. Because of its special smell, it can repel insects and prevent mildew. In ancient books, camphor is placed in clothing and books, which can keep it hidden for a long time. In ancient libraries and clothing warehouses, camphor was often used to repel insects and moths, and protect precious classics and beautiful clothes.
Third, it is used to make spices. Camphor has a fragrant smell, which can add aroma. When perfuming, a little is often added to increase the level and durability of the fragrance. In ancient times, when the rich family incense and make sachets, camphor is often used as a raw material to make its aroma rich and can remove filth and deodorize.
In summary, camphor has important uses in medicine, antiseptic, incense and other fields, and is an indispensable material in ancient times.

Mercury, commonly known as mercury, is a liquid metal with many unique physical properties.
Mercury is silvery white in color and dazzling in light. It is a unique liquid among common metals. It flows freely at room temperature, like a smart silver flow. It is cold to the touch and feels strange. Its density is quite high, 13.59 grams/cubic centimeter, which is heavier than ordinary metals. When it is poured on top of other things, it can quickly slide and converge.
Mercury has an extremely low melting point of only -38.87 ° C, so it is liquid at room temperature; its boiling point is 356.6 ° C. This property makes mercury change its state sharply when the temperature changes.
Furthermore, mercury has good electrical conductivity, although it is inferior to good conductors such as copper and silver, but in liquid substances, its electrical conductivity is outstanding.
Mercury has a high surface tension. If dropped on a flat object, it will automatically gather into round and moist mercury beads, just like silver pearls, and it is not easy to disperse. When touched, it will also roll.
In addition, mercury is volatile and will slowly evaporate into mercury vapor at room temperature and pressure. This needs to be treated with caution because its vapor is toxic and too much inhalation is harmful to human health. Mercury has important uses in metallurgy, chemical industry, medicine and other fields. However, due to its unique physical properties, it must be used with great care to prevent mercury leakage from causing harm.

The chemical properties of cyclopentyl methyl ether are quite stable.
In the molecular structure of cyclopentyl methyl ether, the cyclopentyl group has a certain steric resistance, and the methoxy group is connected to the cyclopentyl group to form a relatively stable chemical structure. Its carbon-carbon bond and carbon-oxygen bond energies are within a certain range, making this compound less prone to bond cracking and rearrangement under normal conditions.
In common temperature and pressure environments, cyclopentyl methyl ether is not easy to decompose spontaneously. Even if it encounters mild oxidation or reduction conditions, it is difficult to be easily oxidized or reduced due to its stable structure. And under extreme conditions such as non-strong acid and strong base, cyclopentyl methyl ether can maintain the integrity of its molecular structure.
And because of its relatively stable chemical properties, it is widely used in many fields such as organic synthesis. It can be used as an excellent organic solvent in many chemical reaction systems, which can effectively dissolve the reactants without interfering with the reaction process due to its own chemical instability. It can ensure that the reaction is carried out in a relatively stable environment, thereby helping to improve the selectivity and yield of the reaction. In the preparation of various fine chemicals, cyclopentyl methyl ether is often selected as the reaction medium. After many practical verifications, the stability of its chemical properties provides a reliable guarantee for the synthesis work.

Although there is no exact record of the synthesis method of cyclohexylamine in "Tiangong Kaiwu", it can be speculated from the ancient chemical process ideas and the preparation of related substances.
In ancient methods, for the synthesis of organic amines, it is mostly obtained by chemical reaction of natural raw materials. Cyclohexylamine can be imagined to start from natural substances containing cycloalkane structure. Vegetable oils and fats are saponified, cracked, or structural fragments containing cycloalkanes can be obtained. If some oils are treated at high temperature, intermediate products similar to cyclohexane structure may be produced.
For the introduction of amine groups, although there are no modern advanced amination methods in ancient times, natural nitrogen-containing substances can be used. For example, nitrogen-containing components in animals and plants can be obtained by protein hydrolysis. By reacting amino acids with cycloalkane-containing intermediates, it may be possible to realize the Under appropriate conditions, the amino group in amino acids undergoes a substitution reaction with cycloalkane derivatives, or cyclohexyl amines can be generated.
In addition, urea, a natural nitrogen-containing compound, also had some understanding and application in ancient times. If urea can be combined with suitable cycloalkane raw materials and reacted under specific conditions, it may be one of the pathways for the synthesis of cyclohexyl amines. For example, in the presence of high temperature and catalyst, urea decomposes ammonia, and ammonia reacts with cycloalkane derivatives, theoretically cyclohexyl amines can be obtained. Although there is no modern concept of catalysts in ancient times, natural ores, plant ash and other substances may play a similar catalytic role.
can also be considered from the perspective of microorganisms. There are many types of microorganisms in nature, and some microorganisms have special metabolic capabilities. Or microorganisms with the ability to convert cyclohexylamine-containing raw materials into cyclohexylamine can be screened and synthesized by microbial fermentation process. Although the specific mechanism of microorganisms was not clear in ancient times, through long-term practice observation, or knowing that some fermentation phenomena can be used for material transformation, the synthesis of cyclohexylamine was indirectly realized.

It is difficult to generalize the price of cyclopentyl acetylene in today's market. Its price often varies due to various reasons, such as the quality, the quantity, the supply situation, or the difficulty of making it.
Generally speaking, if the quality, purity and quantity are abundant, the price may be slightly flat in the state of equilibrium between demand and supply. However, the production of cyclopentyl acetylene, or the complicated method, requires exquisite art. If so, its price will be high. And it is a raw material for transformation, which is useful in all domains. If there is a demand for prosperity and a lack of supply, the price should also rise.
There are also various merchants, whose prices are different due to their business policies and transportation costs. The price of cyclopentyl acetylene sold by small merchants may be higher or lower due to the benefits of scale.
According to today's market conditions, the price of cyclopentyl acetylene ranges from tens to hundreds of dollars per gram. If you buy in quantity, the price may be slightly reduced; if you buy a small amount, the price may be higher. And its price is not constant, and it changes with the market. It rises and falls from time to time, and it is difficult to have a fixed number. Therefore, if you want to know its exact price, you should carefully observe the state of the market and consult all merchants to compare it, so that you can get a near-real price.