1 - (dioxomethyl) - 3 - chlorobenzene, although this substance is not directly mentioned in "Tiangong Kaiwu", but from the perspective of ancient chemical industry, its use may have several ends.
In ancient pharmaceuticals, the extraction and synthesis of pharmaceutical ingredients often relied on various chemical substances. 1 - (dioxomethyl) - 3 - chlorobenzene or due to its own chemical properties, can be used as a reaction medium to assist in the extraction of the active ingredients of some medicinal materials. Ancient physicians studied pharmacology and were very particular about drug processing. They often used various additives to optimize drug production. If this substance is involved, it may change the solubility and stability of pharmaceutical ingredients, thereby improving the efficacy.
Pigment production is also a way. Ancient painters have extremely high requirements for the quality of pigments, and pursue bright colors and long-lasting color. 1 - (dioxy methyl) - 3 - chlorobenzene may play a role in the synthesis of pigments, participate in the construction of pigment molecular structure, and give pigments unique properties. For example, in the treatment of mineral pigments, it can promote the refinement of pigment particles, disperse evenly, and make the color of paintings more delicate and lasting.
Furthermore, it may have applications in leather treatment. Leather was commonly used in the lives of the ancients. The leather needed to be tanned and waterproof during the tanning process. 1 - (dioxy methyl) - 3 - chlorobenzene can be used as a tanning agent auxiliary agent to enhance the bonding force between the tanning agent and the leather fiber and improve the durability of the leather; or it can be used for waterproof treatment to change the chemical properties of the leather surface and make it have waterproof function to meet the diverse needs of the ancients for leather products.

1 - (dioxomethyl) - 3 - fluorobenzene is a genus of organic compounds. Its physical properties are unique, let me tell them one by one.
Looking at its properties, under normal circumstances, it is mostly a colorless to light yellow transparent liquid with a clear texture, just like a clear spring. The smell of its smell is not pungent and intolerable, but it also has a unique smell, which is quite special. If you smell it carefully, you can feel a different fragrance. Although it is not rich, it is enough to attract attention.
As for the boiling point, this compound is about in a specific temperature range. Generally speaking, it fluctuates up and down at a relatively clear temperature point. The characteristics of this boiling point make it possible to transform from liquid to gaseous under certain conditions, just as ice turns into water when heated, and water turns into steam when heated, following the law of material change.
Its melting point is also fixed, and at a certain temperature, the solid-liquid states can be converted to each other. When the external temperature drops below the melting point, this substance condenses from liquid to solid state, just like water turns into ice when cooled. The shape changes, but its chemical nature remains unchanged.
Furthermore, density is also one of its important physical properties. The density of this compound is higher than that of common substances, or there may be differences. Under certain conditions, it presents a specific value. This value reflects the amount of substances contained in its unit volume. When compared with other substances, it can be seen that its weight is different.
In terms of solubility, 1- (dioxomethyl) -3-fluorobenzene has good solubility in organic solvents. If mixed with some common organic solvents, it can be uniformly dispersed and fused. Just like salt dissolves in water, no particles are seen, only a uniform liquid phase. However, in water, its solubility may be different, or insoluble, or slightly soluble, depending on specific conditions.
The physical properties of this compound are of critical significance in chemical research, industrial production, and related fields. Due to its boiling point, melting point, density, solubility, etc., it affects its behavior in various reactions and processes. It is like a delicate gear in the vast machinery of chemistry, each performing its own duties and promoting the operation of related processes.

The physical properties of 1 - (dioxomethyl) -3 -hydroxynaphthalene are stable. Although these two are not detailed in "Tiangong Kaiwu", the reason for their stable properties can be obtained based on the current chemical theory.
Let's talk about dioxomethyl first. In its structure, oxygen atoms are connected to carbon atoms to form relatively stable chemical bonds. Oxygen has a large electronegativity and strong attraction to electrons, which makes the distribution of electron clouds around carbon relatively stable. Methyl groups connected to it can play the role of electron generators. Although the influence is limited, it also helps to stabilize the overall structure. In addition, such structures are not easy to react violently with common reagents in common chemical environments, so their chemical properties are quite stable.
As for 3-hydroxynaphthalene, the naphthalene ring has a conjugated system, and the conjugation effect reduces the molecular energy and greatly increases the stability. The hydroxyl group is attached to the naphthalene ring. Although the hydroxyl group is active to a certain extent, the conjugation of the naphthalene ring dominates the molecular properties. The solitary pair electrons of the oxygen atom of the hydroxyl group can be conjugated with the naphthalene ring to further disperse the electron cloud and make the system more stable. Under normal conditions, 3-hydroxynaphthalene can maintain a stable state without the action of special reagents such as strong oxidizing agents and strong acids and bases.
To sum up, the chemical properties of 1- (dioxomethyl) -3-hydroxynaphthalene are relatively stable, and this structure is determined, which

To make 1 - (dioxomethyl) - 3 - chloropyridine, you can follow the following ancient methods:
First, use pyridine as the base and introduce chlorine atoms first. Dissolve the pyridine in a suitable organic solvent, such as dichloromethane, cool down to a specific range, generally about 0 - 5 ° C. Slowly add chlorine-containing reagents, such as phosphorus oxychloride. After adding it dropwise, raise it to a moderate temperature, about 60 - 80 ° C, and reflux the reaction number. This process requires close monitoring of the reaction progress, which can be observed by thin-layer chromatography (TLC). When the reaction reaches the desired level, cool the reaction liquid, pour it into ice water, neutralize it with an alkali solution, such as sodium hydroxide solution, and adjust it to neutral or weakly alkaline. Then extract with an organic solvent, collect the organic phase, dry it with anhydrous sodium sulfate, and then steam to remove the solvent to obtain a chloropyridine-containing intermediate.
Second, introduce dioxomethyl groups into the above intermediates. Put the chloropyridine-containing intermediate into the reactor, add an appropriate amount of base, such as potassium carbonate, and a dioxomethylating agent, such as a mixture of dichloromethane and paraformaldehyde. At a suitable temperature, about 50-70 ° C, stir the reaction for a period of time. During this period, the reaction is continuously monitored by TLC. After the reaction is completed, solid impurities are filtered to remove, the filtrate is washed with water several times, and then dried with anhydrous magnesium sulfate. Finally, the product is purified by reduced pressure distillation or column chromatography to obtain 1- (dioxy methyl) -3 -chloropyridine.
Second, another method can first prepare pyridine derivatives containing dioxy methyl groups, and then perform chlorination reaction. Pyridine and formaldehyde are reacted under specific conditions to form pyridine compounds containing dioxy methyl groups. Take an appropriate amount of pyridine, mix it with an excess formaldehyde aqueous solution, add an appropriate amount of acid as a catalyst, such as sulfuric acid, at a moderate temperature, about 40-60 ° C. After the reaction, extract with an organic solvent, collect the organic phase and dry it. Subsequently, the dioxomethyl-containing pyridine compound was chlorinated. According to the previous method, phosphorus oxychloride was used as the chlorination reagent, reacted at a suitable temperature and conditions, and then neutralized, extracted, dried and purified. The target product 1 - (dioxomethyl) - 3 - chloropyridine can also be prepared.

Dichloromethyl-3-bromobenzene requires attention to many matters during storage and transportation.
First, when storing, it must be placed in a cool and well-ventilated place. Due to the nature of the substance, it may be affected by temperature and air. If the storage environment temperature is too high or the ventilation is not smooth, or it causes chemical reactions, it is even a risk of safety.
Second, keep away from fires and heat sources. Dichloromethyl-3-bromobenzene is a chemical product that may cause combustion or even explosion in case of open flames and hot topics, posing a serious threat to surrounding personnel and facilities.
Third, it should be stored separately from oxidants, edible chemicals, etc., and must not be mixed. Because of its contact with these substances, or violent chemical reactions, toxic and harmful gases are generated, or more serious consequences.
Fourth, the storage area should be equipped with suitable materials to contain leaks. In case of leakage, it can be dealt with in a timely and effective manner to avoid its spread and reduce the harm to the environment and personnel.
As for transportation, the transportation vehicle must be equipped with the corresponding variety and quantity of fire fighting equipment and leakage emergency treatment equipment. In this way, in case of emergencies during transportation, timely response measures can be taken. And during transportation, it is necessary to ensure that the container does not leak, collapse, fall, or damage. It is important to know that if there is a problem with the container and the substance leaks, it will not only cause material loss, but also bring unpredictable danger. In addition, during transportation, you should follow the specified route and do not stop in residential areas and densely populated areas. This is to minimize the impact on the lives and property of the general public in the event of an accident during transportation. In short, whether it is storing or transporting dichloromethyl-3-bromobenzene, it is necessary to strictly follow relevant norms and requirements to ensure the safety of personnel and the environment.