The classification of chemical reagents in China is basically based on purity (impurity content), with a total of 7 types including high-purity, spectral purity, reference, spectral purity, superior purity, analytical, and chemical purity.

This classification not only considers practicality, but also takes into account the characteristic properties of the reagents. Therefore, it is both convenient for safe storage and easy for laboratory workers to follow safe operating rules when using it.

Pharmaceutical intermediates are chemical raw materials or products used in the synthesis process of active pharmaceutical ingredients. They do not require a production license for active pharmaceutical ingredients and can be produced in ordinary chemical

The Chemical Abstracts Service (CAS), a subsidiary organization of the American Chemical Society, is responsible for assigning a CAS number to each substance appearing in literature. Its purpose is to avoid the trouble of having multiple names for chemica

After determining the experimental formula and relative molecular weight, the understanding of an organic molecule has not been resolved because often several organic compounds have the same molecular formula, but their physical and chemical properties ar

Methanol: Because it was first discovered in distilled wood, it is commonly known as "wood alcohol" or "wood essence", also known as hydroxymethane.

There are many types of organic compounds, which can be divided into two categories: hydrocarbons and derivatives of hydrocarbons. According to the carbon framework structure of organic molecules, they can also be divided into three categories: open chain

There are very few elements that make up organic compounds, besides carbon, there are also a few elements such as hydrogen, oxygen, sulfur, nitrogen, phosphorus, and halogens. But the number of organic compounds is extremely large, with over 10 million sp

There are two main reasons for the large number of organic compounds: (1) carbon atoms can combine with each other in various ways to form stable, linear, branched, or cyclic compounds of different lengths

For the chemical discipline mainly engaged in the study of compound molecules, in addition to general chemical terminology, it is also necessary to give each compound molecule its own name, which has exceeded tens of millions and is still increasing day b