N-(1,1-Dimethylethyl)-2-thiophenesulfonamide

The chemical structure of N- (1,1 -dimethylethyl) -2 -tert-butyl naphthalene is as follows:
The main chain of this compound is a naphthalene ring. The naphthalene ring is a polycyclic aromatic hydrocarbon structure composed of two fused benzene rings. It has a fixed atomic connection method and a conjugated system, which endows it with certain stability and unique chemical properties.
On the nitrogen (N) atom of the naphthalene ring, a (1,1 -dimethylethyl) group is connected. This group is also called tert-butyl. Its structure is one carbon atom connected to three methyl groups, and the whole presents a relatively compact spatial structure. At the same time, at position 2 of the naphthalene ring, another tert-butyl is connected. Due to its special spatial structure, tert-butyl has a significant impact on the spatial configuration, electron cloud distribution and chemical properties of the whole molecule. It has a large steric hindrance effect. In chemical reactions, it will hinder the proximity of reagents to certain positions of the naphthalene ring, thereby affecting the selectivity and rate of the reaction. In addition, the electron cloud induction effect of tert-butyl will change the electron cloud density distribution on the naphthalene ring, so that the electron cloud density of the carbon atoms connected to the tert-butyl group and its ortho and para-sites increases relatively, which affects the reactivity and check point of the compound such as electrophilic substitution. In conclusion, the chemical structure of N- (1,1-dimethylethyl) -2-tert-butylnaphthalene determines its unique physical and chemical properties.

In the first chapter of "Tiangong Kaiwu", many agricultural activities involved in rice production seem to be directly related to "1,1-dimethyl ethyl" and "2-tert-butyl p-cresol". However, the book details the whole process of rice production from seedling raising and transplanting to field management and harvest, and the methods used during this period are related to many aspects.
When raising seedlings, it is necessary to choose good seeds. The choice of good seeds is related to the harvest of rice. This is the basic way. "Grain seeds should not be mixed, and when a strong wind interacts with pollen, they will divide the boundaries." Only when the good seeds are pure can the quality of rice be maintained.
The method of transplanting rice seedlings is also exquisite. "Thirty days after the seedlings are born, they should be uprooted and divided into plants." It is necessary to transplant rice seedlings in a timely manner, and the time is accurate, which is related to the root growth of rice seedlings. Field management and irrigation are particularly important. "In mountain fields, those with water sources will wait until summer is over, and they will be planted in June." According to the water source and timely irrigation, the rice seedlings can thrive.
Fertilization method, "For those with cold pulp in the soil, it is appropriate to dip the ashes into the roots of the seedlings, and the lime will flood the seedlings." For different soil qualities, different fertilizers are applied to improve the soil and promote the growth of rice seedlings.
Deworming and pest control can also not be ignored, "the early rice will be cut down, and the soil will heat up with manure, and the seedlings will be very lush". Reasonable farming operations can prevent pests and ensure a bumper harvest. During harvest season, "where rice loses water in ten days, it will die, and a kind of upland rice will be invented.
The way of rice farming described in" Tiangong Kaiwu "covers improved seeds, transplanting seedlings, irrigation, fertilization, pest prevention, harvest and other links. It is the key to rice production. It seems to have no practical connection with the chemicals involved in the question. However, its agricultural way still has reference significance to this day.

Dimethyl ether, also known as methyl ether, has unique physical properties.
Looking at its form, under normal temperature and pressure, dimethyl ether appears as a colorless gas, but it is also easy to liquefy. When the appropriate pressure is applied or the temperature is reduced, it can be converted into a liquid form. This substance has a special odor. Although its taste is not pungent, it is unique.
When it comes to volatility, dimethyl ether is very volatile. Because of its low boiling point, only about 10.8 ° C, it is easy to convert from liquid to gaseous and escape into the air. This property makes it effective in many application scenarios, but it is also necessary to pay attention to its volatilization loss during storage and use.
In terms of solubility, dimethyl ether is slightly soluble in water. Its molecular structure makes its interaction with water molecules weak, so its solubility in water is limited. However, it can be miscible with many organic solvents such as ethanol, acetone, chloroform, etc. in any ratio. This property makes it widely used in the fields of organic synthesis and extraction. It can be used as an excellent solvent to promote various organic compounds to mix and react with each other.
In terms of density, dimethyl ether has a lower density than water, about 0.683 g/cm ³. If it is placed in the same container as water, it will float on the water surface. This physical property is quite practical in separation operations and related experiments.
In addition, the vapor density of dimethyl ether is greater than that of air, which is about 2.56 (air = 1). This means that during use or storage, if there is a leakage, the vapor will spread close to the ground, easily accumulate in low-lying places, and there are certain safety hazards, such as exposure to open flames or high heat energy causing combustion and explosion.

To prepare N- (1,1-dimethylethyl) -2-aminothiazoline, the synthesis method is as follows:
An appropriate starting material can be taken first, and thiazoline can be used as the base of the parent nucleus construction. In a suitable reaction system, a 2-amino group is introduced. This step can be carried out by means of a specific amino-containing reagent under suitable reaction conditions, such as at a specific temperature and in the presence of a catalyst, with thiazoline derivatives Substitution reaction occurs to connect the amino group to the second position of thiazoline.
Then, N - (1,1-dimethylethyl) group is introduced. Reagents containing 1,1-dimethyl ethyl can be selected, such as tert-butyl halide. Under basic conditions, bases can deprotonate the nitrogen atom of thiazoline derivatives, enhance their nucleophilicity, and then undergo nucleophilic substitution reaction with tert-butyl halide to achieve N- (1,1-dimethyl ethyl) connection.
During the reaction process, the reaction conditions of each step need to be precisely controlled. The temperature will affect the reaction rate and selectivity. Excessive temperature may cause side reactions to occur, and too low will delay the reaction. The choice of catalyst is also critical, which can effectively reduce the activation energy of the reaction and speed up the reaction process. The polarity of the reaction solvent also affects the progress of the reaction, and careful selection is required according to the specific reaction mechanism and raw material characteristics. After each step of the reaction is completed, high-purity intermediate products and final target products should be obtained by separation and purification methods such as extraction, distillation, and column chromatography to ensure the efficiency of the synthesis path and product quality.

If you want to use mercury (that is, mercury), you must pay attention to all things. Mercury is highly toxic, and the first protection is when it is used. In front of tight clothes, wear gloves and masks to prevent its gas from entering the body and avoid its contact with the skin.
Mercury is volatile, and when used in an open place, the gas speed will disperse in the air, increasing the risk of poisoning. Therefore, it should be used in a well-ventilated place, or a ventilator should be installed to reduce the concentration of mercury gas in the air. If mercury is used in a room, it must be carefully checked after finishing to ensure that no mercury is left behind.
Mercury storage is also exquisite, and it is advisable to place a closed device to prevent it from evaporating. If mercury is accidentally sprinkled, don't panic. Quickly take sulfur powder and cover it. Mercury and sulfur quickly melt to form non-toxic mercury sulfide, and then clear it.
In addition, mercury utensils must be carefully selected. Although glass is transparent and easy to detect, it is fragile and causes mercury leakage. Therefore, tough and airtight utensils are preferred.
When recording the use of mercury, be sure to be accurate, such as dosage, time of use, location and operator. This can help track the whereabouts of mercury, and in case of emergencies, such as leakage or poisoning, provide critical information and deal with it quickly.
In short, when using mercury, one must be cautious and follow all things to avoid risk and protect one's health and environment.