1% 2C2-dibromo-3-chloropropane, used in mulberry farming in the past, has a wide range of uses. It is mainly used to control many pests hidden in the soil, such as nematodes. Nematodes often hide in the soil and bite the roots of crops, causing difficulties in crop growth, sharp reduction in yield and quality. 1% 2C2-dibromo-3-chloropropane applied to the soil can poison such nematodes, protect the root system of crops and make them grow.
However, with the passage of time, its drawbacks gradually become apparent. Although the prevention effect on pests was quite good at the beginning, it has been seriously harmful to the environment and human beings over time. Its chemical properties are difficult to decompose in the soil, accumulate in the soil for a long time, cause soil ecological imbalance, harm beneficial microorganisms, and gradually lose soil fertility. And this substance can penetrate into groundwater, pollute water sources, and endanger the safety of drinking water for humans and animals. In terms of human health, it enters the body through respiratory tract, skin contact, etc., or causes many diseases, such as damage to the nervous system, diseases of the reproductive system, etc.
Therefore, in view of its great harm to the environment and the human body, this agent has been gradually abandoned, and a safer and more environmentally friendly alternative is sought to protect the prosperity of farmers and mulberry and protect the ecological balance.

1% 2C2-dibromo-3-chloropropane is an organic halide. In the past, it was used as a soil fumigant to prevent and control nematodes and other soil pests. Its physical properties are as follows:
- ** Properties **: It is a colorless to light brown liquid under normal conditions, and it is clear and transparent to view. "Tiangong Kaiwu" said: "The distinction of various colors is first in the eyes. This liquid is colorless to light brown, and it is clear to the bottom." That is, the color state of its appearance can be clearly seen by visual inspection.
- ** Odor **: It has a pungent and spicy smell, and it can be strongly sensed by sniffing. The ancients said: "Smell and know its nature, pungent and spicy, this sign of qi is also." Its unique odor can be identified by the sense of smell.
- ** Boiling point **: about 196-198 ° C. Although the exact boiling point is not recorded in "Tiangong Kaiwu", it can be known from ancient observations of heat and material changes that this substance will change in phase at a specific temperature. In this temperature range, it gradually changes from liquid to gaseous.
- ** Melting point **: about -6 ° C. At this temperature, the substance will solidify from liquid to solid. As the ancient book says: "Cold condensation has a temperature in each season." This is the specific temperature at which it solidifies.
- ** Density **: about 1.93 g/cm ³, heavier than water. According to the ancient trade-off measurement, it can be known that it will sink in water. The so-called "heavy one sinks, and the light one floats up, due to physical properties."
- ** Solubility **: Slightly soluble in water, soluble in most organic solvents, such as ethanol, ether, acetone, etc. Although this solubility is not detailed in "Tiangong Kaiwu", it is known that it is sparse with water and compatible with organic solvents based on the principle of phase perception.

The chemical properties of 1,2-dichloro-3-butene are usually quite stable. This substance contains a dichloro atom and an ethylene bond, but the existence of the two does not cause it to be strong and volatile.
Looking at its structure, although the ethylene bond has reactivity, it can lead to various reactions such as electrophilic addition, but the resistance effect and electron absorption of the dichloro atom inhibit the activity of the ethylene bond. The chlorine atom has strong electronegativity, which causes the electron cloud to be biased, which decreases the density of the ethylene bond electron cloud and reduces the possibility of attack by electrophilic reagents.
And the carbon-chlorine bond energy is quite high, so a lot of energy is required to break this bond. Under normal conditions, 1,2-dichloro-3-butene is not easy to self-initiate violent reactions. However, under specific conditions, such as high temperature, strong catalysts or strong reactive reagents, it can also be converted accordingly.
However, in terms of conventional environments, its chemical properties are stable and do not easily react significantly with common substances. Therefore, it can be relatively stable at room temperature and pressure without special conditions.

The synthesis method of 1% 2C2-dibromo-3-chloropropane has been known in ancient times and has a wide variety. The following is a detailed description of Jun.
First, allyl chloride is used as the initial raw material. Allyl chloride has good activity and can react with bromine under suitable conditions. In a low temperature and dark place, bromine is slowly dropped into allyl chloride, and at the same time supplemented by appropriate catalysts, such as iron powder, can promote the reaction. Allyl chloride double bond encounters bromine, and an addition reaction occurs to generate 1,2-dibromo-3-chloropropane. This reaction path is clear and relatively simple to operate. However, it is necessary to pay attention to the reaction temperature and the dropwise acceleration of bromine to prevent side reactions.
Second, propanol is used as the starting material. First, propanol is converted into chloropropanol under specific conditions, which can be achieved by reacting with chlorinated reagents such as hydrogen chloride gas or phosphorus trichloride. The obtained chloropropanol is then substituted with brominated reagents, such as a mixture of sodium bromide and sulfuric acid. At the time of the reaction, control the temperature and the ratio of the reactants to obtain 1,2-dibromo-3-chloropropane. Although this approach is slightly complicated, the raw materials are easy to obtain, and the cost may be controllable.
Third, propylene is used as the source. Propylene first undergoes a high-temperature substitution reaction with chlorine to form 3-chloropropene. This reaction requires precise control of the temperature and the amount of chlorine, otherwise it is easy to cause the formation of multiple substitution products. Then 3-chloropropene reacts with bromine to obtain the target product 1,2-dibromo-3-chloropropane. This method has a wide range of raw materials, but the high-temperature reaction requires high equipment, and the reaction conditions need to be strictly controlled.
All kinds of synthesis methods have their own advantages and disadvantages. According to actual needs, consider the cost of raw materials, reaction conditions, product purity and many other factors, and choose the best one.

1% 2C2-dibromo-3-chloropropane must be paid attention to the following things during storage and transportation:
First, this material is toxic and harmful to both the human body and the environment. In the storage place, it is necessary to ensure good ventilation to prevent the accumulation of toxic gases. The storage place should be far away from crowded places, such as residential areas, schools, hospitals, etc., and should also be separated from food and feed to avoid pollution. During transportation, transportation personnel need to take good protection, such as protective clothing, wearing gas masks, etc., and the transportation vehicle should also ensure that it is airtight to prevent leakage.
Second, the nature or instability of 1% 2C2-dibromo-3-chloropropane. The temperature and humidity of the storage environment must be strictly controlled. The temperature should be maintained within a specific range. Do not make it too high or too low to avoid decomposition or deterioration. The humidity should not be too high to prevent it from absorbing moisture and affecting the quality. When transporting, avoid high temperature, sun and rain, and configure temperature control equipment for vehicles if necessary.
Third, 1% 2C2-dibromo-3-chloropropane is a dangerous chemical, and its storage and transportation must comply with relevant regulations and standards. Storage requires professional permission, and transportation vehicles and personnel must also have corresponding qualifications. During storage and transportation, emergency plans should be prepared. If there are emergencies such as leaks, they can be responded to quickly to reduce hazards.
Fourth, the storage quantity and transportation route of 1% 2C2-dibromo-3-chloropropane should be recorded and planned in detail. Storage records should include the time and quantity of warehousing, warehousing, etc. The transportation route should avoid densely populated and environmentally sensitive areas, and ensure the legal compliance of the route.