1 Bromo 3 Tert Butyl 5 Iodobenzene

Mercury, the common water, is a common gold element. Its chemical symbol is Hg, atomic number is 80. Mercury is liquid in normal conditions, and it is the only liquid gold. It has many special chemical properties.
The chemical properties of mercury are determined by phase, and it is not easy to generate most acids. However, it can generate reactions from oxidizing acids, such as sulfuric acid and nitric acid. Taking the reaction of nitric acid as an example, mercury is oxidized to form mercury nitrate, which is the same as nitric acid and nitrogen dioxide. The inverse equation is roughly: Hg + 4HNO () = Hg (NO) () () () () () () () () () () (+ 2NO) () () () () (+ 2H) O.
Mercury can be easily combined with chlorine, bromine, iodine and other elements to form mercury compounds. For example, mercury can be reacted with chlorine to form mercury chloride. The reaction can be generated under suitable conditions, and the reaction rate is fast.
Mercury can form some gold alloys, and this alloy is used as mercury. For example, mercury can form mercury. Mercury is often used as a precursor in some reactions because of its special chemical activity.
In air, mercury is generally not oxidized under normal conditions. However, under the addition of mercury, mercury can be oxidized to form mercury oxide. This reaction shows that the reaction activity of mercury under different conditions is poor.
There are many compounds of mercury, and their properties vary. For example, mercury chloride has a certain toxicity and oxidation; the properties of mercury sulfide are not determined, and the sand is usually in the form of mercury sulfide.
Therefore, the chemical properties of mercury are not special, and there are many inverse expressions in the chemical field, and they show different chemical activities under different conditions, and their compounds also have their own characteristics.

In order to prepare 1 + -sialin-3- (guanidine) -5-pyrimidine, the following methods can be used:
First, the nitrogen-containing heterocyclic ring is reacted with a specific halogenated hydrocarbon. First, take the appropriate nitrogen-containing heterocyclic ring, whose structure needs to be related to the pyrimidine, and place it in a suitable reaction vessel. Add an appropriate amount of organic solvent to fully dissolve the nitrogen-containing heterocyclic ring to form a homogeneous solution. Then, slowly add a specific halogenated hydrocarbon that has been accurately measured. The position and structure of the substituent of this halogenated hydrocarbon have a great influence on the reaction result. The temperature and dripping speed need to be strictly controlled during the dripping process to prevent side reactions from occurring. After the dropwise addition is completed, the temperature is raised to a certain temperature and the reaction is continuously stirred for a period of time. The reaction mechanism lies in the nucleophilic substitution reaction between the halogen atom of the halogenated hydrocarbon and the specific position on the nitrogen-containing heterocycle, and the basic structure of the pyrimidine is gradually constructed. After the reaction is completed, the target product can be obtained through a series of operations such as separation and purification.
Second, the cyclization reaction is used. Select a specific organic compound whose molecular structure needs to have a functional group that can undergo cyclization reaction under specific conditions. This compound is placed in the reaction system together with an appropriate amount of catalyst, and a suitable reaction solvent is added. By adjusting the reaction temperature, pressure and other conditions, the cyclization reaction occurs in the In this process, the chemical bonds within the molecule are rearranged, broken and formed, and the cyclic structure of pyrimidine is gradually constructed. Catalysts play a key role in this reaction, which can reduce the activation energy of the reaction, speed up the reaction rate, and improve the yield of the product. After the reaction is completed, extraction, distillation, crystallization and other methods are used to separate and purify to obtain pure 1 + -saliva-3- (guanidine) -5-pyrimidine.
Third, a multi-step reaction strategy is adopted. First, an intermediate with a partial target structure is prepared through a series of reactions. This process involves a variety of organic reaction types, such as addition, elimination, and substitution. After precise separation and identification of the intermediate, the intermediate is used as the raw material to gradually build the structure of the remaining part through further reactions. Each step of the reaction requires strict control of the reaction conditions to ensure the selectivity and yield of the reaction. Although the multi-step reaction process is complicated, it can more accurately construct the complex structure of the target product. Finally, after meticulous purification treatment, high-purity target compounds can be obtained.

"Tiangong Kaiwu" says: saltpeter, sulfur and charcoal, which are the three essential substances of gunpowder. Charcoal, flammable; saltpeter, when heated, releases oxygen, and has strong combustion-supporting power; sulfur, active, also increases the power of gunpowder.
In organic synthesis, charcoal has a wide range of uses. First, it can be used as a reducing agent, in many reactions, to take oxygen from other substances and reduce it. Second, charcoal can be used as a catalyst carrier, supporting active components, and assisting in the progress of the reaction. Furthermore, activated carbon has strong adsorption properties and can be used to separate and purify organic products.
Saltpeter, scientific name potassium nitrate, is often used as an oxidizing agent in organic synthesis. It can oxidize specific functional groups to obtain the desired product. For example, oxidizable alcohols are aldoxides or ketones. And because it can provide nitrate ions, it is a key reagent for the introduction of nitro groups in some nitration reactions.
Sulfur is also indispensable in organic synthesis. It can be used in vulcanization reactions to cross-link polymer compounds such as rubber and enhance their properties. In addition, in the synthesis of some sulfur-containing compounds, sulfur is an important sulfur source. Through specific reactions, sulfur atoms are introduced into the structure of organic molecules.
Realgar, its main component is arsenic disulfide. In the field of organic synthesis, the application is relatively rare. Occasionally seen in some special reactions involving the introduction of arsenic, but due to its toxicity, it needs to be used with extreme caution.
Charcoal, saltpeter, sulfur have their own uses in organic synthesis, and although realgar is not used much, it should not be underestimated. It is necessary to choose carefully according to the purpose and conditions of the reaction to achieve the goal of synthesis.

Boron is a strange thing between heaven and earth, with a warm and changeable nature. Its color is often plain, or like the cleanliness of a thin cloud, or the softness of a light mist. The quality is slightly brittle, but under high temperatures, it can show different toughness.
The chemical activity of boron is quite unique. When it comes to strong acids, although it does not react as violently as others, it can be subtly changed, integrated into it, and its properties can be changed. When it comes to strong alkalis, it can also deal with it, or generate novel compounds. The process is like a delicate dance, intermolecular interactions, and the interpretation of wonderful chemical chapters.
And boron is useful in all kinds of industrial techniques. In the art of metallurgy, adding a little boron can make the metal texture tough and light, like the sharpening of the sword, sharpening the edge more than in the past, but without losing the flexibility, suitable for the forging of many equipment, whether it is a flying tool, or a sea tool, all rely on its strength and durability.
In the art of ceramics, boron can make the porcelain as delicate as fat, the color is warm and moist like jade, and it also increases its heat resistance. It makes the porcelain glow with extraordinary beauty in the high temperature kiln fire, not afraid of sudden cold and heat, and lasts for thousands of years without damage, just like the guardian of the years.
Furthermore, boron is also indispensable in the way of electronics. It can help make delicate semiconductors, make electrons flow like a stream, accurate and fast, and give all kinds of electronic artifacts a smart soul. Whether it is a small communication artifact or a complex computing machine, it has excellent functions due to the participation of boron, leading the world into the magical world of science and technology.
Arsenic, this thing is highly toxic, fierce and fierce. The color is as white as frost and snow. At first glance, it looks like harmless crystal powder, but in fact it hides lethal killing intent.
Its taste seems light at first, but after entering the body, the toxicity is immediately apparent. Arsenic can disturb the normal transportation of human organs, make qi and blood inverse, and block meridians. The organs are invaded, like the beams of a building being eaten by insects, and gradually fall. Poisoned people often feel severe pain in their stomachs, like knives twisting cones, and then vomiting and diarrhea, their bodies are as weak as candles in the wind, and the fire of life is shaking and dying.
In nature, arsenic is often born in the land of minerals, and it coexists with all kinds of minerals. Its nature is cold, like a messenger of the underworld, and what it touches gradually loses its vitality. Although it is extremely poisonous, in medicine, if used in a small amount of medicine, it can also play a wonderful effect, which can cure some serious diseases and diseases, just like a wonderful way to fight poison with poison, showing the two sides of things. However, in such usage, those who need medicine are exquisite in skills and have both courage. If there is a slight mistake, it will lead to a catastrophe. Therefore, people in the world are more in awe of arsenic and dare not slack off a little.

Good questioner, when you ask about the storage requirements of cabin ships, you must examine all the things in detail before you can get them in detail. And listen to me come one by one for you.
The storage of cabin ships is the first to be stable. The things placed in the cabin must be properly placed to prevent the things from tilting and rolling when the ship is turbulent, causing the hull to be unbalanced and endangering the safety of the ship. Therefore, all the stored things should be fixed or stacked in sequence to ensure security.
Furthermore, moisture prevention is extremely important. If the moisture in the cabin is too heavy, many things are prone to moisture and rot. Therefore, the bulkhead needs to be tight to prevent seawater from infiltrating; and moisture-proof objects, such as lime, can be placed to absorb moisture and protect the accumulated materials from drying.
Ventilation should not be ignored. If the air in the cabin does not circulate, it is easy to cause odor to breed, and it will also accelerate mildew. Therefore, it is necessary to set up ventilation openings, or open the hatch cover according to the weather to make the air flow smoothly and keep the cabin clean.
Fire prevention is the top priority. There may be flammable objects stored in the cabin, so fire prevention measures are essential. Fireworks are strictly prohibited, and fire extinguishers need to be prepared. In case, they can be put out quickly.
In addition, classification and storage are also key. Different things are classified into their own categories, which is convenient for finding and managing. Such as food and sundries, do not mix; flammable and ordinary things should be placed separately.
Also pay attention to the weight distribution. The accumulated things should be evenly distributed in the cabin, and one side of the hull should not be too heavy, causing unstable navigation.
Overall, the storage of the cabin ship, stability, moisture resistance, ventilation, fire prevention, classification and even weight are all essential and indispensable. All things are taken into account to ensure that the stored things are in good condition and the ship travels smoothly.