4 Iodo 2 Methylanisole

In "Tiangong Kaiwu", it is recorded that the main uses of sesame seeds and tea crops are quite extensive.
Sesame seeds, its use is first to extract oil. Sesame oil has a rich aroma and has excellent performance in the field of diet and cooking, whether it is to add unique flavor when cooking vegetables or to improve the taste of cold dishes. At the same time, sesame seeds also have effects in the field of medicine. The ancients believed that they have a certain nourishing effect on the body, can regulate qi and blood, and enhance physical fitness. In addition, sesame seeds are often used to make various kinds of cakes and snacks, such as common sesame cakes, sesame paste, etc., which not only enriches the variety of food, but also brings delicious enjoyment to people.
Sesame crops have the same variety of uses. First, they can be used as an important source of food. Beans are rich in protein, which can provide sufficient energy and nutrients for the human body, and are key substances for maintaining life activities. Second, they can be used to make soy products, such as tofu, bean skin, soy milk, etc. Tofu has a tender taste, various cooking methods, and can be fried, fried, and stewed; soy milk is rich in nutrients and is a favorite drink by the people. Third, beans also play a role in fertilizing soil in agricultural production. The rhizobium at the root of beans can fix nitrogen, increase the nitrogen content in the soil, improve soil fertility, and create good conditions for the growth of subsequent crops.
In short, sesame seeds and beans play an indispensable and important role in diet, medicine, agriculture, and many other aspects, providing important support for the production and life of the ancient people.

Lead and mercury are the glory of hardware, the finest of heaven and earth. Lead is the righteous qi of the north, its quality is heavy, its color is black and it has gold in it, and its nature is heavy and it is good to fall. Mercury is the liquid of the south, its nature is light and flying, its color is white and agile, and it is good to change.
The shape of lead is dignified and thick, and it has the ability to fall. It is like the carrier of kun soil, which is stable and not floating. Its color is black, which should be in the water virtue of the north, and contains the qi of true yang, like a hidden dragon in the abyss. Refined with fire, it can be turned into liquid. Although it has undergone intense fire, it will not lose its quality, but the essence condenses the gas, and it will not be destroyed.
Mercury is not the same. Its weight is light, like the erratic cloud and fog, and its sexual pleasure rises and changes rapidly. The color is white as snow, pure and flawless, just like the dry sky and clear the air. When heated, it evaporates and dissipates in the void, but it can also be integrated with other things and transform into an invisible form.
Compared with the two, lead is stable, and it is maintained in the middle. Its qi is thick and powerful, which can be the foundation of the cauldron and carry all kinds of changes. Mercury is agile, flying and uninhibited, and its qi is clear and good, which can lead to the nature of medicine and travel through the meridians. The combination of lead and mercury, such as the symmetry of yin and yang, the combination of rigidity and softness, can produce wonderful transformation. Lead, with its thickness and lightness in mercury production, prevents mercury from flying away; mercury, with its agility, prompts the stagnation of lead, so that lead can change according to the opportunity.
Therefore, the physical properties of lead and mercury, lead is heavy and heavy, and mercury is light and floating; lead black and mercury white, lead condensation mercury powder. The two have their own characteristics. If they can be well reconciled, they will have extraordinary effects in the way of alchemy and pharmacy, which can be used for health and longevity.

Lead and mercury are commonly used in ancient alchemy. Lead is heavy in nature, blue and gray in color, soft and malleable. In the art of alchemy, it is often used as a basic material. Mercury, commonly known as mercury, is liquid at room temperature, silver-white in color, flowing like beads, and is highly volatile.
Lead is stable and heavy, and in the process of alchemy, it is often regarded as an element to stabilize the structure of alchemy pills. Its chemical properties are relatively stable, and it is not easy to react quickly with many ordinary substances. When heated by fire, it can gradually change, or combine with other substances to change its characteristics. However, many lead compounds are toxic and must be used with caution.
Mercury is flexible and active, and has a strong volatility. In alchemy, it is easy to form amalgam with other metals, and this characteristic is valued by alchemists. Mercury is easy to sublimate when heated, and can change from liquid to gaseous state, and then condense into liquid state. This change in the eyes of alchemists contains the wonders of creation. However, mercury and most of its compounds are also toxic, and if not disposed of properly, it is easy to cause poisoning.
Ancient alchemists used lead and mercury as the basis to explore the medicine of longevity and the method of turning stone into gold. Although its cognition and operation are many unscientific, it has also left a unique mark in the process of chemical exploration. His observation and utilization of the chemical properties of lead and mercury provide some experience and thinking for the development of chemistry in later generations. From today's perspective, the toxicity of lead and mercury is well known to the world, and its application is limited. Looking back, we can see the dedication and efforts of the ancients to explore the mysteries of natural substances.

To prepare methyl ether, there are two methods.
One is the reaction of sodium alcohol and halogenated hydrocarbons. Take ethanol and react with sodium metal to obtain sodium ethanol. The reaction is as follows: $2C_ {2} H_ {5} OH + 2Na\ longrightarrow 2C_ {2} H_ {5} ONa + H_ {2}\ uparrow $. Then, take halogenated ethane, such as bromoethane, and co-heat with the obtained sodium ethanol to obtain methyl ethyl ether. The reaction formula is: $C_ {2} H_ {5} ONa + C_ {2} H_ {5} Br\ longrightarrow C_ {2} H_ {5} OC_ {2} H_ {5} + NaBr $. This reaction is a nucleophilic substitution reaction. The alkoxy negative ion in sodium ethanol acts as a nucleophilic reagent to attack the carbon atom connected to the halogen in halogenated ethane, and the halogen ion leaves to form an ether.
The second is the intermolecular dehydration reaction of alcohol catalyzed by concentrated sulfuric acid. Mix an appropriate amount of ethanol with concentrated sulfuric acid and heat it to a specific temperature. Concentrated sulfuric acid acts as a catalyst to cause the hydroxyl group of one molecule of ethanol to combine with the hydrogen atom of another molecule of ethanol to form water and dehydrate, thereby forming methyl ethyl ether. The reaction formula is: $2C_ {2} H_ {5} OH\ xrightarrow [140 ^ {\ circ} C] {concentrated sulfuric acid} C_ {2} H_ {5} OC_ {2} H_ {5} + H_ {2} O $. It is necessary to pay attention to the control of temperature. If the temperature is too high, ethanol is prone to intramolecular dehydration to produce ethylene.
Both methods can produce methyl ether. In practical applications, the appropriate method should be selected according to factors such as the availability of raw materials, cost and reaction conditions.

The method of preparation is related to the efficacy of medicine, especially the first and second medicines. When storing and transporting, many taboos should be avoided and must not be ignored.
A medicine is mild in nature, but it is easy to lose its nature when it is dry. When storing, it is advisable to choose a cool place to avoid the scorching sun. And it needs to be moisture-proof, and the moisture will soak it, and the medicinal power will gradually disappear. The place should be well ventilated, so that the medicinal qi can flow smoothly, so as not to cause depression and closed and change. When applying, do not mix with hot and dry things to prevent its nature from being disturbed by heat. The packaging must also be tight, so as not to contact with the foul gas and damage its authenticity.
B medicine is cold, moist and dry. Hidden in a humid place, you can place it on the side of the water tank to borrow water vapor to nourish its properties. But it should not be too humid and cause mildew and rot. If transported, it must be prevented from freezing in winter. If it is extremely cold, the quality of the medicine will easily crack and the power of the medicine will dissipate. In summer, it is better to take it in an ice cellar or a cool car. When using it, avoid warm and dry agents to prevent cold and heat from being excited and lose the original effect.
Both are stored, transported and applied according to their physical properties. Medicine is a tool that saves people, and the physical properties are not lost, so the effect can be complete. If there is a slight mistake, or if it misses the pathogenesis of people and diseases, doctors and medicine should act cautiously and pay attention to the details of the transportation, one by one, so as to live up to the kindness of the doctor and concoct the essence.