2-phenylpyridine-3-carbonitrile

"Tiangong Kaiwu" has a saying: "Ramie is originally from the south, but its quality is weak, so it should not be applied to the cold regions of the north. However, it has a wide range of uses and is of great benefit to people's livelihood."
The primary use of ramie is in textiles. Its fibers are slender and tough, silky and shiny, and strong, absorb moisture and dissipate heat quickly, making it the best raw material for textiles. The fabric woven with ramie is called summer cloth. Its texture is cool and breathable. When it is worn in hot summer, it feels refreshing and pleasant, so it is the first choice for the ancients to make clothes in summer. " Tiangong Kaiwu mentioned that "where ramie has no soil and does not grow, its cultivation is also deep ploughing, thick dung soil, governing the beds and planting, and irrigation at any time." The ramie produced is "made of ramie into strands, woven into cloth". Although the craftsmanship is complex, the quality of the cloth is excellent. It is not only widely popular in China, but also exported overseas. It is an important component of China's traditional textile industry.
Furthermore, ramie also has wonderful uses in papermaking. Its fibers are specially treated to produce high-quality paper. This paper is tough and can be preserved for a long time, making it suitable for writing and painting. Many precious ancient books, calligraphy and painting can be passed down to this day, and the paper made of ramie has contributed greatly. " "Tiangong Kaiwu" contains the method of papermaking, "cutting bamboo and floating ponds, boiling and boiling with fire, punching the mortar, swinging the material into the curtain, covering the curtain and pressing the paper, and drying through fire". Although ramie papermaking steps are complicated, it can produce excellent paper products and carry the inheritance of civilization.
In addition, ramie also plays an important role in the preparation of ropes. Because of its tough fibers, the ropes woven are wear-resistant and durable, and are often used to tie heavy objects, mooring ships, and building buildings. It is indispensable in ancient transportation, water conservancy projects, and construction.
In summary, although ramie originated in the south, it is widely used. Whether it is woven into cloth to cover the body, made paper to pass on texts, or braided ropes to assist in labor, it has a profound impact on the production and life of the ancients. It is a precious product between heaven and earth.

Lead is one of the hardware, its quality is heavy, and its color is blue and gray. At room temperature, lead is relatively stable, and it is not easy to react quickly with common things, so it can often exist in the world for a long time.
Lead has good ductility and can be beaten and extended into thin sheets or drawn into silk, which is convenient for craftsmen to shape and is used in the fabrication of many utensils. And the melting point of lead is not high, about 300 degrees. When heated with charcoal fire, it can be melted into a liquid and easy to cast into various shapes.
Lead has a high density. Compared with other things, lead is thicker and heavier in the same volume. This property makes it useful where it needs to gain weight. Furthermore, lead has good sound insulation and radiation protection properties. Although the ancients did not understand the principle of radiation protection, they often used its sound insulation effect in palace construction and other aspects to ensure indoor tranquility.
In addition, lead also has its drawbacks. It is toxic. If it is accidentally ingested or exposed for a long time, it will damage human health. Although the ancients did not fully understand the harm of lead poisoning, they occasionally noticed it. For example, those who have been engaged in the smelting of lead for a long time often suffer from diseases. And although lead is relatively stable in the atmosphere, it will react when it encounters acids and other substances, causing its surface to change and damage its original appearance. Although lead is insoluble in water, it will also affect the water body over time.

There are several ways to synthesize 2-naphthyl ethyl ketone.
One is the Fu-Ke acylation reaction. Naphthalene and acetyl chloride are used as raw materials to react under the action of Lewis acid catalysts such as anhydrous aluminum trichloride. In this process, Lewis acid first interacts with acetyl chloride to generate acyl positive ions, which attack the naphthalene ring as an electrophilic reagent and undergo electrophilic substitution. Acetyl groups are introduced at specific positions in the naphthalene ring to obtain 2-naphthyl acetone. This method has relatively mild reaction conditions and high yields. However, the reaction needs to be carried out in an anhydrous environment to avoid catalyst deactivation. < Br >
Second, it can be achieved by the reaction of naphthalene with acetic anhydride under the catalysis of similar Lewis acid. Acetic anhydride is more stable and relatively easy to operate than acetyl chloride. The reaction mechanism is similar to that of acetyl chloride as a raw material. Acetic anhydride forms an active intermediate under the action of a catalyst, and then reacts with the naphthalene ring to form the target product. However, this reaction rate may be slightly slower than that of acetyl chloride as a raw material.
Furthermore, 2-naphthalene acetone can be synthesized using organometallic reagents. For example, the corresponding organolithium reagent or Grignard reagent is prepared from naphthalene first, and then reacts with acetyl halide or acetate ester. Taking Grignard's reagent as an example, after the naphthalene is made into Grignard's reagent, it reacts with acetyl halide. The carbon negative ions in Grignard's reagent attack the carbonyl carbon of acetyl halide, and after hydrolysis, 2-naphthyl acetone is obtained. This method requires stricter reaction conditions, strict anhydrous and anaerobic, and high activity of organic metal reagents. Caution is required during preparation and use.
The above methods for synthesizing 2-naphthyl acetone have their own advantages and disadvantages. In practical applications, it is necessary to weigh and choose the most suitable method according to specific needs, such as raw material availability, reaction conditions, cost, and requirements for product purity.

In today's market, the price of mutton often varies from time to time, and it varies from place to place.
Looking at the abundance of the year, if the year is smooth, the grain is abundant, and the forage is sufficient, the sheep and livestock will be easy to raise, and the price may tend to be flat. However, when the year is short, the forage is scarce, and the sheep are difficult to raise, the price will rise.
It also depends on the distance, distance, and width of the region. The capital is rich in people, and there are many people who need mutton, but the sale is endless, and the price may be slightly flat and stable. As for the despicable land, although there is a lot of sheep production, it is difficult to transfer, or the price may be high or low. If you are in a traffic jam and fresh foreign goods come in, the price of mutton will be either high or low, depending on the local supply and demand.
And the supply and demand of the market will have a huge impact on the price of mutton. At this time of the season, such as in autumn and winter, the people like to eat mutton more to keep out the cold, and the demand will increase greatly, and the price will also rise accordingly. In spring and summer, there are a little few mutton eaters, and the supply exceeds the demand, and the price may drop.
And the operation of the merchant also affects the price. Good operators can reduce costs, set prices reasonably, or attract customers. If you are in a strange situation and drive up prices, the price will rise.
Roughly speaking, the price of mutton can range from tens of dollars a catty to hundreds of dollars a catty. However, this is not a fixed number, and times change, and the price is also changeable. People in the market who want to buy mutton can only get the appropriate price when they observe the market.

Nitrogen is the essence of life. It is an important component of protein bodies and nucleic acids, and is related to the growth and reproduction of all things. Nitrogen is cycled in nature, and its state in the soil is closely related to the growth of plants.
The conditions for nitrogen storage are the first to weigh the texture of the soil. For loam soil, it is aerated and permeable and retains water and fertilizer, which is suitable for nitrogen retention. Its particles are moderate and the pore ratio is appropriate. It can not only store nutrients, but also circulate air and help nitrogen conversion. Clay is sticky and heavy in texture. Although it has strong fertility retention, it has poor aeration, or causes slow nitrogen conversion. When it is anoxic, it is prone to denitrification and nitrogen escape. Sand soil has large pores and weak fertility retention, and nitrogen is easily lost with water.
The pH of the soil is also critical. Neutral to slightly acidic environments favor nitrogen retention and transformation. Peracid and alkali are unfavorable. When acidic, the activities of aluminum and iron in the soil increase, combining with nitrogen, reducing their effectiveness. When alkaline is high, ammonium nitrogen is easily volatilized into ammonia, causing nitrogen loss.
The role of microorganisms is indispensable. There are various microorganisms in the soil, such as nitrifying bacteria, denitrifying bacteria, etc. Nitrifying bacteria can convert ammonium nitrogen into nitrate nitrogen, which is easy for plants to absorb. Denitrifying bacteria can reduce nitrate nitrogen to nitrogen and escape into the atmosphere when there is a lack of oxygen. Appropriate temperature and humidity can promote the reproduction and activity of microorganisms, which is conducive to nitrogen conversion and storage. Usually, the temperature is 25 to 30 degrees Celsius, and the soil moisture is 60 to 80%.
In addition, the method and amount of fertilization also affect nitrogen storage. Reasonable fertilization, according to plant needs and soil fertility, timely, appropriate and appropriate application of nitrogen fertilizer can increase nitrogen utilization and storage. If excessive nitrogen fertilizer is applied, it will not only be wasted, but also cause soil compaction and water eutrophication.
It is necessary that nitrogen storage depends on factors such as soil texture, pH, microbial activity and fertilization. Coordinate all factors to ensure that the soil is rich in nitrogen, promote plant growth, and maintain ecological balance.