Chemical structure of endorphin

                   (Chemical structure of endorphin)
It is the chemistry of 'carbon'-based compounds, but for some reason it does not cover elements such as carbon or' alloys' that contain carbon.  In addition, the importance of organometallic reagents such as Grubbs' catalyst  has increased in organic synthesis since the 20th century. But it can be regarded as an area of ​​inorganic chemistry. On the basis of the carbon-hydrogen bond, what is often regarded as an organic compound such as 'urea' becomes an inorganic compound. In fact, there is no fundamental difference between organic and inorganic compounds. Since the origin of the term 'organic chemistry' originated, it seems most comfortable to believe that the contents in the textbooks of university organic chemistry are organic chemistry.
The word 'organic' is a sign of vitality that there is a fundamental difference between the substances that make up living things (mostly carbon compounds) and those that make up the rest of inanimate things in the past 19th century. Originally, it was a study on substances occurring in living things and their chemical reactions, that is, studies close to the present biochemistry, but after finding out that substances in living things exist outside life and can be artificially synthesized , all carbon compounds And the properties, transformation, and synthesis of derivatives. The only thing we can say with certainty about characterizing organic compounds is that they are made of carbon. Really nothing Although many of the basic compounds have carbon.
It's centered on 'carbon', so you don't need to learn just one carbon. It has special abilities. Even if only one cell is moved nearby, looking at silicon or nitrogen, the orbital becomes too flat or the electronegativity is too high to achieve a stable chain structure with only a single element. This makes it possible to make all kinds of compounds based on only one carbon. Conversely, there are many reactions that students of organic chemistry need to memorize, and the life on Earth is living by taking advantage of this property of carbon.
It is a field that greatly contributed to the development of petrochemical and 'polymer' chemistry, biochemistry, and food chemistry in the 20th century. Since most of the biomolecules are organic matters and most of the bioactive substances studied to date are organic matters, they serve as basic studies in biology, pharmacy, and medicine. Therefore, it is one of the most demanding areas of chemistry. In organic chemistry, a functional group, which is a functional unit in which a couple of three or four atoms are linked by a covalent bond, is more important than each element.