5-bromobenzo[b]thiophene-2-carbonitrile

Ethyl sulphur is also a genus of mercaptan. It is active in nature and shows various characteristics in chemical things.
First, it has the nature of foul smell. Ethyl sulphur gas is pungent and unpleasant, and it spreads far, although it is easy to be felt in trace amounts. This odor, due to its unique molecular structure, can stimulate the olfactory receptors of the human nose, so it is often used as a warning gas. If it is added to gas, once the gas leaks, people can feel it with its stench.
Second, it is flammable. Ethyl sulphur can react violently with oxygen in the air, burning when exposed to open flames or hot topics. The chemical equation of its combustion is:\ (2C_ {2} H_ {5} SH + 9O_ {2}\ stackrel {ignited }{=\!=\!=} 4CO_ {2} + 2SO_ {2} + 6H_ {2} O\). When burning, the flame is light blue, but because of its combustion produces harmful gases such as sulfur dioxide, the combustion products will cause pollution to the air.
Third, it is reducing. The valence of sulfur in ethyl sulfur is not the highest valence state, so it is reducing. It can react with oxidizing substances. If it encounters concentrated sulfuric acid, a redox reaction occurs. Ethyl sulfur is oxidized, and the valence of sulfur is increased. Concentrated sulfuric acid is reduced, and the valence of sulfur is reduced. < Br >
Fourth, a substitution reaction can occur. In the ethyl-sulfur molecule, the hydrogen atom connected to sulfur has certain activity and can be replaced by other atoms or atomic groups. For example, under appropriate conditions, halogen atoms can replace hydrogen atoms connected to sulfur in ethyl-sulfur molecules to form halogenated ethyl-sulfur.
Fifth, can form complexes with metal ions. Sulfur atoms in ethyl-sulfur contain lone pairs of electrons, which can coordinate with some metal ions to form stable complexes. This property has important applications in the separation, purification and analytical chemistry of certain metal ions.

The flintlock of the sun is also a tool for making fire in the sun. In ancient times, the flintlock of the sun was made of gold, and it was like a mirror. Its method is to choose good gold, and it is refined so that there are no impurities. The craftsman uses ingenuity to grind it to make light, like the brilliance of the bright moon. When in use, put the sun under the sun, focus on the light, and need a moment to make fire. This is the method of making fire with the sun flintlock, and it is also a common technique.
There are also those who make fire by drilling wood. Choose dry wood, cut one end of it to be sharp, and drill it into the groove of other wood. The hands turn quickly and unremittingly, because of friction to generate heat, after a long time, the sparks will come out, and then get fire. Although this ancient method was laborious, it was commonly used by the ancient people, relying on cooked food, heating, and subdued beasts.
Furthermore, strike fire with stones. Those who seek hard stones, such as flint, strike iron tools. When the two collide, sparks burst out, and fall on flammable things, such as moxa velvet, hay, etc. With a little blowing, the fire will burn. This is also a simple method, often used by travelers.
As for the method of making fire with phosphorus, I have also heard of it. Phosphorus is flammable by nature. The ancients or applied phosphorus to wood chips, which burned when exposed to oxygen. However, phosphorus is not easy to obtain, and its strong nature makes it not widely used.
All kinds of fire-making methods are gathered by the wisdom of the ancients. The sun is exquisite, the drilling wood is simple, the stone is convenient, and the phosphorus is special. Each has its own strengths, and it is used according to the situation. It has great merit in the progress of human civilization.

In the realm of sacrifice, the ancients worshiped the gods, and the sacrificial ceremonies were solemn and solemn. The sun can gather the light of the sun to make fire. This is the method of making fire in the sun.
In the realm of sacrifice, the ancients worshiped the gods, and the sacrificial ceremonies were solemn and solemn. The sun can gather the light of the sun to make fire. This fire is pure and sacred. It is used for sacrificing incense, burning prayers, etc., to show reverence and piety for the gods, and to pray for the arrival of well-being, good weather, and peace and stability of the country and the people. "Zhou Li Qiuguan Si Xuan's Family" contains: "Si Xuan's family, in the palm of the husband, then take the open fire in the sun, so as to learn from the bright water in the moon, so that the bright candles and clear water can be sacrificed together." It can be seen that it is important in sacrifice.
Furthermore, in the realm of medical health care, it also has applications. Ancient healers knew that the nature of the yang flintlock to make fire is pure yang. Moxibustion with the fire taken by the yang flintlock treats diseases, and its warm power penetrates the meridians. When a person is affected by wind cold and dampness, qi and blood are blocked, and joints are painful, moxibustion with this fire can warm the meridians, dissipate cold and dehumidify, and help the patient restore health. "Compendium of Materia Medica" says: "The yang flintlock is also a fire mirror. Cast of copper, its face is concave, and it is hot to the sun. Moxibustion is especially suitable for diseases."
In addition, in the daily use of fire, the yang flintlock also plays a role. In the past, making fire with flint or drilling wood required skill or time-consuming and laborious. The sun flintel is slightly simpler to operate. On sunny days, it holds the sun flintel to the sun and adjusts the angle to focus the light on flammable objects, which can get fire in an instant, providing convenience for daily activities such as cooking and lighting. During the march, or working in the field, the sun flintel is especially practical for emergency fire.

Vegetables are natural in nature and have all kinds of physical characteristics. Their shapes and colors are different, long or round, green or red, and their shapes and colors are all carved by heaven. Look at their leaves, or as wide as the palm, to support rain and dew; or as slender as a belt, swaying in the wind. This is their external image, showing their intuitive appearance.
As for the texture, or crisp and refreshing, the entrance feels fresh, and if you bite it lightly, the juice will overflow, just like a spring flowing between the teeth; or flexible and tendinous, you need to chew slowly to taste their unique taste, such as the charm of precipitation over the years.
Furthermore, the smell of A vegetable is also different. There are those who are elegant and fresh, just like the stamens that first bloom in the spring breeze, emitting a natural fragrance, which is refreshing to smell; there are also those who have a strong smell, such as spicy fragrance and pungent, but under the thin smell, there is a unique fragrance, which is unique.
The nature of vegetables has their own belonging between cold, heat and cold. Those who are cold and cold in nature can clear away heat and reduce fire. In the summer, they are like a cooling agent to relieve dryness and heat; those who are warm in nature can warm and dissipate cold, and in the cold season, they can give warmth to the body like the warm sun.
Its specific gravity is also different, or lighter than water, can float on it, like a light boat, leisurely in the blue waves; or heavier than water, sinking at the bottom of the water, like a stable person, hidden deep. These are all different physical characteristics, which are nourished by the creation of heaven and earth, water and soil. All kinds of characteristics constitute the unique physical properties of A and vegetables, which are treasures of diet health and daily use, and are also wonders endowed by heaven.

Looking at the world today, the outlook for the A-vegetable market can be described as complex and changeable, like a changing celestial phenomenon, it is difficult to put it in a word.
Nowadays, people's livelihood is placing more and more emphasis on the health of the diet. A-vegetable is rich in nutrients and delicious, and it has gradually entered the recipes of everyone. It is a choice for health care. This is a bright side of its future. And among the markets, the food culture is prosperous, and all kinds of delicacies need to be matched with ingredients. A-vegetable is indispensable in the field of cooking because of its wide range of adaptations. Therefore, the demand is quite considerable, and the potential for market expansion still exists.
However, there are also many hidden worries. First, the matter of farming mulberry often depends on the weather. Droughts, floods, frost and hail disasters can damage the harvest of A-vegetable, causing unstable market supply. Once there is a shortage of supply, prices will be like a runaway horse, with unpredictable ups and downs, which is greatly unfavorable to the smooth operation of the market. Second, the competition in business is fierce, and similar vegetables compete in the market. It is not easy to stand out. All kinds of new and good varieties of vegetables are also constantly coming out. If A vegetable cannot be introduced and the quality is improved, it may be abandoned by the market. Third, the world's good is changing with each passing day. Food trends are changing rapidly. If A vegetable cannot conform to the trend and meet the new taste preferences of the public, it will also face difficulties.
Furthermore, business operators need to consider costs. The cost of agricultural fertilizer, manpower, and transportation is rising steadily. If it cannot be properly weighed and the cost is reasonably controlled, the road to profit will be bumpy. In today's market, information flows like electricity, and consumers have higher requirements for the origin and quality of nail and vegetables. If suppliers cannot clearly disclose and win the trust of others, business opportunities will also be lost.
The market prospect of nail and vegetable, opportunities and challenges coexist. To seek a long-term perspective, we need to understand the right time and the right place, make good use of technology to ensure harvest and improve quality, follow the trend to meet the needs of the public, and be careful to operate to control costs and build reputation. In this way, we are expected to stand on the bow in the tide of the market and sail towards the bright world.