Difference between divinylbenzene and diethylbenzene

Divinylbenzene (Vinylbenzene) and diethylbenzene (Diphenylethylene,DB) are two aromatic compounds that are often mentioned in the chemical industry, and they are significantly different in terms of structure, properties and applications. This article will analyze the difference between divinylbenzene and diethylbenzene from multiple perspectives to help readers better understand the characteristics of these two compounds.

1. basic structure and naming rules

The naming rules of divinylbenzene and diethylbenzene are slightly different, which reflects their structural characteristics.

1. Structure of divinylbenzene Divinylbenzene is a compound in which a benzene ring is connected to ethylene (ethylene) through a double bond. Its structure can be expressed as benzene ring fused to a vinyl group. From the naming rules, the naming of double bonds takes precedence over substituents, so the correct name of divinylbenzene is vinylbenzene.

2. Structure of diethylbenzene The structure of diethylbenzene is relatively symmetrical, with two ethyl groups (ethyl groups) connected to the benzene ring, and the two ethyl groups are connected by a single bond. Its structure is diphenylethane, I .e. a vinyl group with two benzene rings connected by a single bond. The naming rules for diethylbenzene conform to IUPAC�6 rules.

2. structural heterogeneity comparison

The structural differences between divinylbenzene and diethylbenzene are mainly reflected in the connection mode and functional group type:

• Structural isomerism of divinylbenzene Divinylbenzene has two double bond structures, I .e., the cis (ortho) and trans (para) isomers. The two double bonds of cis-divinylbenzene are located in the ortho position, while the double bond of trans-divinylbenzene is located in the para position. This isomerism makes divinylbenzene more active in chemical reactions.

• Structural Isomerism of Diethylbenzene The structure of diethylbenzene is relatively symmetrical and there is only one structural isomer. Its two ethyl groups are symmetrically attached to the benzene ring, so there are no isomers.

3. physical properties comparison

Although the structures of divinylbenzene and diethylbenzene are different, their physical properties are also significantly different:

1. Boiling Point The boiling point of divinylbenzene is 133°C, while the boiling point of diethylbenzene is 69.5°C. This indicates that divinylbenzene is liquid at room temperature, while diethylbenzene is easier to evaporate.

2. Density Divinylbenzene has a density of 1.20g/cm³, which is slightly higher than that of diethylbenzene, which has a density of 1.01g/cm³. This indicates that divinylbenzene has a higher molecular weight, or that there is a larger molecular weight contribution in the molecular structure.

3. Solubility Divinylbenzene has good solubility in organic solvents, while diethylbenzene has poor solubility, mainly in non-polar solvents.

4. chemical properties comparison

There are also significant differences in the chemistry of divinylbenzene and diethylbenzene:

1. reactivity Due to the presence of its double bonds, divinylbenzene has high chemical reactivity and is easy to participate in addition reactions. For example, the addition reaction of divinylbenzene with HX(HX represents a halogen) is usually completed at room temperature. Because of its symmetrical structure and low reactivity, diethylbenzene usually needs to react under specific conditions.

2. Stability Divinylbenzene is easily decomposed at high temperature to produce a structure of diethyldiphenyl ring. Diethylbenzene, on the other hand, has high stability and is not easily decomposed.

5. industrial application comparison

Divinylbenzene and diethylbenzene have different applications in industrial production:

1. Application of divinylbenzene Because of its good chemical properties, divinylbenzene can be used to synthesize phthalate drugs (such as aspirin, ETc.), as well as some daily chemical products. Divinylbenzene is also widely used in organic synthesis as an intermediate.

2. Application of Diethylbenzene Diethylbenzene is mainly used as an aid in the manufacture of organic solvents and plastics. It is widely used in industry, especially as a plasticizer in the manufacture of solvents and plastics.

6. environmental protection and toxicity comparison

In terms of environmental protection and toxicity, divinylbenzene and diethylbenzene also have significant differences:

1. Toxicity Divinylbenzene has low toxicity and is harmless to the environment and human body. It is commonly used as an industrial solvent and auxiliary agent. However, diethylbenzene has certain toxicity, even if it is used in industry, its use concentration still needs to be strictly controlled.

2. Environmental impact The degradation rate of divinylbenzene in the environment is fast, and the ecological impact is small. The degradation rate of diethylbenzene is slow, which may cause some pollution risk to the environment.

7. summary

Divinylbenzene and diethylbenzene are two frequently mentioned compounds in the chemical industry, and there are significant differences in their structures, properties and applications. Because of its double bond structure, divinylbenzene has high reactivity and is widely used in organic synthesis. As a symmetrical structure, diethylbenzene has low reactivity, but it is more widely used, especially in the manufacture of organic solvents and plastics.

From the above analysis, it can be seen that divinylbenzene and diethylbenzene have different characteristics in many aspects. When choosing which compound to use, it needs to be weighed according to the specific application needs and environmental requirements.