3-pyridinecarboxaldehyde

3 - The main use of poison is to kill people with poison. According to the description in "Tiangong Kaiwu", the poisonous person has a huge poison in his feathers, so he drains wine, and the wine becomes extremely poisonous, and he will die immediately after drinking it.
In ancient times, poison was often a means of power struggles and conspiracies. In the court, those who were intriguing, fighting for power, or wanting to get rid of dissidents, thought of using poison to harm. Because the poison occurs quickly and its whereabouts are difficult to detect, it is favored by those with ulterior motives.
In the world of rivers and lakes, when there is a dispute over vengeance, there are also people who secretly use poison to hurt people. Its poison is so strong that it makes people change their appearance when they hear it, and it can often cause death in an invisible way.
However, the poison of the poison, although it is a weapon of murder, is also spurned by the right path. Using poison to harm people, not what a benevolent gentleman does, is actually a sinister and cunning act that goes against ethics. Therefore, although the poison has this poisonous power, it is ultimately unacceptable to the justice of the world, and it only ends up in the name of a tool of evil, and it is smelly in history. Although its use can cause death in an instant, it also highlights the sinister nature of the human heart and the ethics of the world.

3- What are the physical properties of the armor? I can answer this question in the form of an ancient text after imitating the "Heavenly Works".

The armor, the name, also the name, also the water, etc. Its physical properties, the first is its shape. The armor is in the shape of a beard, and there are armor on the back and abdomen. The carapace is slightly arched, with a soft shape, and the color is blue and gray, or brown. It often depends on the environment of the breath. There are many spots on it, which can help it to be covered with sand and stones in the water. The abdominal armor is smooth, light in color, often white or light.
Second time, it is the ground. The carapace is hard, but it is hard and has a character. This hard armor can be worn and reach the outside. Its flesh is tender, rich in protein and so on. The legs of the beetle are thick and short, and the toes are webbed, so it is easy to move in the water, and it can also crawl on the bank and mud. The beetle can be stretched and moved, and the body can be moved into the beetle, limbs and tail to protect itself.
Re-evaluate its nature of life. The beetle likes fresh water such as rivers, lakes, ponds, etc., where the water is clear and the water is lush, often in the sediment at the bottom of the water, or on the back of the bank reef and wood. The beetle is transformed by the external environment, so it has the nature of hibernation in winter, and it enters the bottom of the water and mud, and comes out in spring.
The breathing of the beetle has the characteristics of the beetle. In water, in addition to breathing, it can also use the microvessels of the skin and the cloaca wall to perform cross-fertilization; to the ground, it can breathe with the lungs. Its senses are sensitive, the eyes are small, the force is good, and it can observe the surroundings; its performance is not weak, and it can perceive micro-vibration.
Of course, A has a place in natural life due to its physical properties. It is not only important for water, but also for people's favorite food. It has a certain value and is naturally important for people's livelihood.

The three kinds of nitrogen, its properties are special. Nitrogen, the color and odor of the gas, is often determined, and it exists in the air, accounting for 70% of it.
Its chemical properties, because its molecules are divided into three kinds of nitrogen and nitrogen, this energy is high, and it is not easy to cause cracking. Therefore, under normal conditions, other substances will react. If it is burning, nitrogen is not a combustion aid, nor is it flammable. It can isolate oxygen, reduce the rate of combustion, and ensure a safe environment.
However, under specific conditions, nitrogen can also develop its activity. High, high or catalytic, nitrogen can be used to reverse, and raw ammonia. This is very important, and ammonia can be used in chemical fertilizers, which is beneficial. And ammonia can be synthesized in one step to form multiple nitrogen-containing compounds, such as nitric acid. Nitric acid is an important chemical raw material, which can be used for frying, dyes, and so on.
Nitrogen can also be reacted to form nitrides. Some gold nitrides have special properties, such as boron nitride, which has high hardness and can be used as abrasives; and has good performance, which is widely used in sub-fields.
In addition, nitrogen oxides are also important reactants. High efficiency, nitrogen and oxygen reactance, to produce nitric oxide, etc. Nitric oxide is quickly oxidized in the air to form nitrogen dioxide. Both of these are major pollutants, which can cause acid rain, photochemical emissions, etc. However, the amount of nitric oxide also has important physiological functions in biological organisms, and can be used for blood vessel relaxation.

There are many methods for the synthesis of ethyl 3-valerynate, each with its own advantages.
First, it can be prepared by the reaction of sodium propionyne with haloate based on propionyne. In this way, propionyne is first interacted with sodium metal or sodium amide to form sodium propionyne. This step needs to be carried out in an anhydrous and inert gas protective atmosphere to prevent the sodium propionylate from decomposing in contact with water or air. Next, sodium propionyne reacts with haloates, such as ethyl bromoacetate, in an appropriate solvent (such as tetrahydrofuran) to obtain ethyl 3-valerynate. This path is simple and the raw materials are easy to obtain. However, the activity of sodium propionyne is quite high, and the operation needs to be cautious to ensure safety. < Br >
Second, it is prepared by the addition reaction of acetylene and ethyl acrylate. First, acetylene is added to ethyl acrylate in the presence of appropriate catalysts (such as copper salts, etc.) and ligands. The reaction conditions are mild, the atomic economy is relatively high, and there is no need to prepare intermediates with extremely high activity. However, the choice of catalyst and the control of reaction conditions are quite critical, otherwise side reactions will easily occur, affecting the purity and yield of the product.
Third, 1,3-dihalopropane and diethyl malonate are used as raw materials and synthesized through multi-step reactions. First, 1,3-dihalopropane and diethyl malonate undergo a substitution reaction under the action of basic reagents such as sodium alcohol to build a carbon chain skeleton. After hydrolysis, decarboxylation and other steps, the target product 3-ethyl valerynate can be obtained. This method is slightly complicated, but the raw materials are common and inexpensive, and the requirements for reaction equipment are relatively low, making it suitable for large-scale preparation.
All this synthesis method has its own advantages and disadvantages. In practical application, it is necessary to weigh the choice according to the availability of raw materials, cost, equipment conditions and product requirements to achieve the best synthesis effect.

The most important thing to do is to pay attention to it.
The most important thing to hide is to pay attention to the land. The earth seeks to be dry, to be clear and to shelter the rain. If there is a problem with the tide, it will be easy to perish. If it is not clear, it will be difficult to avoid the rain. If it is not clear, it will not be easy to perish. If it is not clear, it will be difficult to avoid the rain, and it will be difficult to meet the rain. And the level of the earth cannot be ignored. The uneven land will be placed in the three layers, or there will be a risk of overturning.
Furthermore, the degree of hiding is also important. If it is too cold, it will be too brittle, and it will be too cold. Therefore, it is advisable to keep the equipment in place, so that the three walls can be safe in them, and there will be no need to receive it.

As long as it is difficult, the package should be packed first. Wrap the three walls with the materials of the warehouse, to prevent them from bumping and shaking on the way. And the package should be packed, so that it is easy to move, so that the driver can save effort and travel.

The tools of the warehouse are also carefully designed. According to the size, weight, and quantity of the three walls, it is appropriate to use a boat, a ship, or other equipment. If the tools are not used, or the damage is caused, there are even three.
Those who do it will definitely be used. Follow the road of the road, avoid urgent transportation and emergency stops, in case the three walls are affected by the force. The road of encountering saky roads, especially, is complete.
In addition, it is advisable to have a supervisor in the process of transportation. If there is a problem, you can quickly set it up so that the three can reach their destination safely. In this way, the hidden things must be properly hidden, and the three tasks can be completed without delay.