English Name: dimethyl carbohydrate
Alternative name: methyl carbonate; DMC; ethane carbonate
Chemical formula: C3H6O3; (CH3O) 2CO; ch3o-cooch3
CAS accession number: 616-38-6
EINECS accession number: 210-478-4
Melting point: 2-4 ℃
Boiling point: 90
The excellent properties and special molecular structure of DMC determine its wide application
Although phosgene (CL co CL) has high reaction activity, its highly toxic and corrosive by-products make it face great environmental pressure, so it will be gradually eliminated; DMC (ch3o-co-och3) has a similar nucleophilic reaction center. When the carbonyl group of DMC is attacked by nucleophilic attack, the acyl oxygen bond breaks and carbonyl compounds are formed. The by-product is methanol. Therefore, DMC can replace phosgene as a safe reaction reagent to synthesize carbonic acid derivatives, such as carbamate pesticides, polycarbonate, isohydric acid ester and so on It is predicted that more than 80% of DMC will be used to produce polycarbonate in 2005;
Due to the similar reasons with phosgene, dimethyl sulfate (ch3o-so-och3) is also facing the pressure of elimination. When the methyl carbon of DMC is attacked by nucleophilic attack, its alkyl oxygen bond breaks, and the methylated product is also generated. Moreover, the yield of DMC is higher than that of dimethyl sulfate, and the process is simpler. Its main uses include synthesis of organic intermediates, pharmaceutical products, pesticide products, etc;
DMC has excellent solubility, narrow melting and boiling point range, high surface tension, low viscosity, low dielectric constant, high evaporation temperature and fast evaporation speed. Therefore, DMC can be used as a low toxicity solvent in coating industry and pharmaceutical industry. It can be seen from table 1 that DMC is not only of low toxicity, but also has the characteristics of high flash point, low vapor pressure and high lower explosion limit in the air. Therefore, DMC is a green solvent with both cleanliness and safety.
