The main use of 3-4-litter grass, according to the "Tiangong", its use is.
First of all, the grass is soft on the ground, and it can be used for all kinds of plants. In summer, the common people often stay here, which is refreshing and pleasant, and its materials are convenient and low cost, so it is popular.
In addition, it can be used for manufacturing. These two herbs are excellent materials. Soaking, steaming, cooking and other processes, such as chemical processing, and then made. Its performance is not as good as the name claims, but it can be used in daily life, packaging, etc., and it is also suitable for use, and the people's manufacturing technology is large.
In addition, in the family life, there are also other wonderful uses. It can be used as livestock feed, which is not refined, but it can fill the belly of livestock and help them overcome the shortage of forage. In winter, it can be turned into a grass handle, which is used for cooking vegetables, to resist cold, and to protect vegetables from damage.
And because of its low fuel consumption and acceptable firepower, it can also be used as firewood. In places where there is a lack of firewood, the people pile it up for cooking and heating, and in the bitter months, it is convenient for the people. In short, 3-4-4-4-4 grass plays an important role in all aspects of people's lives and is indispensable to the people.

The physical properties of the 3-jiang-4-haicao stone are special. It is thick and heavy, the color is thin, the reason is natural, and the stone is thick and ancient.
This stone sinks in water but does not float, but its density is large, and it can also be solid in water, as if the earth is deep. Its hardness can resist the grinding of ordinary times, and it is easy to add axes to the body. This is its nature.
Furthermore, it is invaded by rain, washed by the moon, and occasionally has pits on the surface, but it also adds its mulberry flavor. Under the light, the light reflected by the stone body is soft, not like the dazzling of a pearl, and it has a high density.
The nature of its appearance is not very clear, it is grasped, the first feeling is not clear, and it has been in harmony for a long time. It is not as cold and piercing as gold or rising rapidly. And its sound is special, with things, the sound of the voice is deep and long, like crossing the sky, containing the vastness of the river and sea, which makes people think, like the river and sea, feeling the waves and the moon change. This physical property makes the 3-river-4-sea canyon stone among the stones, with a pattern, which is worthy of the wonder of heaven and earth creation.

Looking at this object, I want to observe whether its chemical properties are stable or not. Between heaven and earth, all things have their own characteristics, whether stable or impatient, all of which are related to their composition and the environment they are in.
3-Jiang-4-Hai-Caoying originates from the river and sea, takes the beauty of heaven and earth, and takes the moisturizing of the river. However, the stability of its nature cannot be broken lightly. The nature of covers often changes due to external circumstances. If you are in a peaceful environment, there is no strong disturbance, or you can maintain its stability. When encountering strong acids and alkalis, or high temperature and high pressure, it may be difficult to maintain its essence.
Just think about it, all things in the world, such as gold, are stable in nature, and do not rot over time. When encountering all kinds of chemical agents, it is difficult to change their quality. It is also stable. Hydrogen, on the other hand, burns in case of fire, and is very impatient. If you don't pay attention, it will undergo tremendous changes, which can be said to be unstable.
As for 3-river-4-sea-caoying, under normal conditions, if there is no disturbance from foreign objects, it may be able to ensure its safety. However, the water of the river and sea is not pure, and there are many impurities in it, or it interacts with 3-river-4-sea-caoying, causing its properties to change. And the environment in which it is located, whether warm or wet, or dry or cold, can affect its properties.
To confirm the stability of its properties, it needs to go through various trials. By chemical methods, check its response to various things. If it does not melt in case of acid, does not change in case of alkali, does not crack at high temperature, and does not coagulate at low temperature, its properties are stable. On the contrary, if there is a slight change, it is difficult to say that it is stable.
Therefore, it is difficult to say in a word whether the chemical properties of 3-Jiang-4-Hai Caoying are stable. It needs to be explored in detail, and its essence can be determined by scientific method.

To prepare 3-alkenyl-4-halogenated naphthalene, the method is as follows:
First push Fu-gram reaction. Naphthalene is used as a group, in a suitable solvent, such as dichloromethane, and Lewis acid such as anhydrous aluminum trichloride is added as a catalyst. An alkenyl halide is introduced, and the alkenyl part has an appropriate protective group to prevent side reactions. Moderate temperature control, about 0 to 25 degrees Celsius, varies according to the activity of the alkenyl halide. The electron cloud density of naphthalene is high. The alkenyl halide forms a carbocation cation under the action of Lewis acid, attacks the naphthalene ring, and introduces the alkenyl group at a suitable position through electrophilic substitution. After that, a halogenated reagent, such as N-halosuccinimide (NBS) or halogen, is introduced into the halogen atom at the alkenyl ortho-position in the presence of light or an initiator to obtain 3-alkenyl-4-halonaphthalene.
Secondly, palladium catalytic coupling can be considered. The alkenyl-containing borate or halogenated alkenyl is first prepared, and the halogenated naphthalene is reacted with palladium on a catalyst such as tetra (triphenylphosphine) palladium complexes, and the base, such as potassium carbonate, is reacted in an organic solvent such as dimethylformamide (DMF). Palladium catalysis enables the formation of carbon-carbon bonds, which can precisely construct the connection between alkenyl groups and naphthalene rings. Follow-up according to the halogenation strategy, select the appropriate halogenation method to obtain the target product.
Furthermore, the multi-step functional group conversion can be carried out. First, the naphthalene is selectively alkylated, and the alkenyl-containing precursor structure is introduced. After oxidation, elimination and other reactions, the alkenyl group is constructed. Then, through the halogenation reaction, halogen atoms are introduced at the desired position. This route requires fine design of the reaction conditions at each step to ensure the accurate conversion of functional groups and reduce side reactions. Each method has its own advantages and disadvantages, and it needs to be selected according to the requirements of raw material availability, cost and product purity.

3 - vortex - 4 - For those who have ditched water, there are indeed many things that need to be paid attention to in terms of storage and transportation.

When storing water, the most important thing is its source. If the source is clean, the water will flow cleanly. If the source is polluted, even if there are good methods to store it, it is difficult to keep the water pure. When choosing a place to store water, it is better to choose a high and dry place and avoid a low and wet place. A high place allows the water to flow down and is convenient for use; a dry place can prevent leakage and prevent water loss. Moreover, the container for storing water must be strong and tight, without any gaps to prevent leakage. The quality of the pottery jars in ancient times and the iron barrels and plastic containers today should all be examined and should not be neglected.

As for transportation, it is important to have unobstructed waterways. Rivers and ditches should be dredged regularly to prevent them from being blocked. In case of floods or droughts, their unblockage should be carefully monitored. In case of drought, water must be transported smoothly to where it is needed to help the farmland; in case of floods, water must be drained quickly to avoid flooding. There are also some requirements for water transport tools. Boats sailing on large rivers must be sturdy and resistant to waves; water vehicles must be protected from vibration and capsizing. The tools used to transport water, such as cattle, horses, and human power, must be of appropriate strength and should not be forced to do what they cannot do.

Furthermore, the transportation and storage of water should be protected from infringement by others. If there are people who steal water, or if there are people who damage water storage devices or block water transport channels, laws should be taken to prevent them. Rules can be established to severely punish lawbreakers; people should also be sent to patrol day and night.

In addition, climate change also affects the storage and transportation of water. In hot summers, water evaporates easily, so water storage should be covered; in cold weather, water freezes easily, so the water transportation routes should be prevented from freezing and cracking. These are all things that we should pay attention to in the storage and transportation of water. We must not be careless and cause the misuse of water, which will harm people's livelihood.