Petroleum Naphthalene Properties

Physical properties: the density is about the same as water, about the same as mothball, there is an "aromatic smell", white, soluble.

Pure. Ether. Most organic solvents such as benzene are insoluble in water.

Chemical Properties:1Substitution reactions.

The main substitution is the chemical formula from left to right of the 2nd and 4th carbons, which have a high yield of bromine bands and are used for synthesis.

There are also carbon, that is, the 1st and 5th carbons, the principle is complex, and generally no requirements are made.

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The reaction with acid chloride is exactly the same as that of benzene, which is very important for synthesis.

2.Addition reaction.

Like benzene, hydrogenation and chlorination can be done, the conditions are not as simple as 1L says, and it is rarely considered, and platinum and heating are required for hard hydrogenation.

Character: Bright flaky crystals with a special odor. Physical Properties Density Melting Point, Boiling Point, Flash Point, Refractive Index Insoluble in water, soluble in ethanol and ether, etc. Volatile, easy to sublimate After being dissolved in ethanol, it is dropped into water, and white turbidity will appear. Molecular structure of two connected benzene rings Properties:

Electrophilic substitution mainly occurs on the naphthalene ring, which is the same as the benzene ring, but the activity is stronger than that of the benzene ring Starting from the C next to the two Cs in the middle symmetry, where carbon 1, 4, 5, and 8 are exactly the same (called alpha carbon), and carbon 2, 3, 6, and 7 are exactly the same (called beta carbon). In general, alpha carbon is more active than beta carbon, the substituent is at the alpha site, which is controlled by kinetics, and at higher temperatures, the substituents on alpha carbon [1] are transferred to beta carbon. However, in the Fred-Clefford acylation reaction of naphthalene, a mixture of alpha and beta is formed without heating.

If nitromethane is used as a solvent, beta acylation products are mainly generated. Modified: The two carbons in the middle are not numbered.

Widely used as a raw material for the preparation of dyes, resins, solvents, etc., and also used as an insect repellent (commonly known as sanitary balls or mothballs). It is easier to substitute than to add.

An organic compound, molecular formula C10H8, white, volatile crystals with a peculiar odor. It is produced in large quantities from coal tar, a by-product of coking, and is used in the synthesis of dyes, resins, etc. The usual hygiene balls are made of naphthalene.

Physical. Density.

Melting Point, Boiling Point, Freezing Point, Flash Point, Refractive Index Constant Volume Heat of Combustion: Standard Atmospheric Pressure, Constant Pressure Heat of Combustion: 40205j g (Standard Atmospheric Pressure,.

Insoluble in water, soluble in ethanol and ether, etc.

It is volatile and easy to sublimate.

After dissolving in ethanol, it is dropped into water, and a white cloudiness appears.

Molecular. Two connected benzene rings.

Chemical properties. (1) Oxidation of naphthalene.

Mild oxidant to obtain quinone, strong oxidant to obtain acid anhydride. Naphthalene is more susceptible to oxidation than the side chains, so naphthalic acid cannot be prepared by side chain oxidation. Rings with high electron cloud density are susceptible to oxidation.

Reduction of naphthalene. Naphthalene can be added with 5 H2 to form decahydronaphthalene.

3) Bonus of naphthalene.

4) Electrophilic substitution reaction of naphthalene.

The -position of naphthalene is more susceptible to electrophilic substitution than the -position. The -bit substitution has a complete benzene ring in both resonant formulas. The -bit substitution has only one resonance formula with a complete benzene ring.

Electrophilic substitution mainly occurs on the naphthalene ring, which is the same as the benzene ring, but the activity is stronger than that of the benzene ring.

Starting from the two c's in the middle symmetry, carbon 1, 4, 5, and 8 are exactly the same (called carbon), and carbon 2, 3, 6, and 7 are exactly the same (called carbon).

In general, carbon activity is greater than that of carbon, and the subsituents are in place, which is controlled by kinetics, and at higher temperatures, carbon[3].

The upper substituents are transferred to the carbon.

However, in the Fred-Clefford acylation reaction of naphthalene, a mixture of bits and bits is formed without heating. If nitromethane is used as a solvent, the acylation product is mainly generated.

Modified: The two carbons in the middle are not numbered.

Use. It is widely used as a raw material for the preparation of dyes, resins, solvents, etc., and is also used as an insect repellent (commonly known as sanitary balls or mothballs). It is easier to substitute than to add.

Summary. No, a burning ban refers to a ban on the burning of harmful substances such as coal and wood to reduce air pollution. Petroleum is a liquid fuel that can be used to generate electricity, cook, and power.

No, the ban on burning is a ban on burning coal, wood and other harmful substances to reduce air pollution. Petroleum is a liquid fuel that can be used to generate electricity, cook, and power. Wax early.

Can you elaborate on that a little bit more?

The ban on burning is not about oil, but about banning the burning of fuels such as coal and wood to reduce air pollution. Air pollution is caused by burning coal, wood and other fuels to produce harmful substances, such as sulfur dioxide and nitrogen oxides, which pollute the air and affect people's health. Workaround:

1.Strengthen the prevention and control of air pollution, prohibit the burning of coal, wood and other fuels, and reduce air pollution. 2.

Strengthen environmental protection awareness, improve people's awareness of environmental protection, enhance environmental protection awareness, and reduce air pollution. 3.Strengthen supervision, strengthen the supervision of air pollution, strictly implement air pollution prevention and control regulations, and reduce air pollution.

Personal Tips:1We should strengthen environmental awareness and minimize air pollution, such as reducing vehicle exhaust emissions, reducing the burning of coal, wood and other fuels to protect the environment.

2.We should pay attention to the latest developments in air pollution prevention and control, and keep abreast of the best air pollution prevention and control policies in order to better protect the environment. 3.

We should actively participate in environmental protection activities, such as participating in tree planting activities and environmental protection publicity activities to promote environmental protection.