Search results
Results from the WOW.Com Content Network
Dimethyl oxalate can be converted into ethylene glycol in high yields (94.7%) [10] [11] The methanol formed is recycled in the process of oxidative carbonylation. [12] Other plants with a total annual capacity of more than 1 million tons of ethylene glycol per year are planned. Decarbonylation gives dimethyl carbonate. [13]
Dimethyl carbonate and dimethyl oxalate are produced industrially using carbon monoxide and an oxidant, in effect as a source of CO 2+. [2]+ + + The oxidative carbonylation of methanol is catalyzed by copper(I) salts, which form transient carbonyl complexes.
Oxalate (systematic IUPAC name: ethanedioate) is an anion with the chemical formula C 2 O 2− 4. This dianion is colorless. It occurs naturally, including in some foods. It forms a variety of salts, for example sodium oxalate (Na 2 C 2 O 4), and several esters such as dimethyl oxalate ((CH 3) 2 C 2 O 4). It is a conjugate base of oxalic acid.
Another process uses oxygen to regenerate the nitric acid, using a variety of precursors including glycolic acid and ethylene glycol. [17] As of 2011, this process was only used by Mitsubishi in Japan. [18] A newer method entails oxidative carbonylation of alcohols to give the diesters of oxalic acid: 4 ROH + 4 CO + O 2 → 2 (CO 2 R) 2 + 2 H 2 O
ODAP can be synthesized from L-α,β-diaminopropionic acid and dimethyl oxalate at a pH of 4.5-5. Cupric oxide can be used to temporarily protect the α-NH2 group of the L-α,β-diaminoproprionic acid during the reaction. [2] The pathway for one chemical synthesis of ODAP
The European Union reached a blockbuster free trade agreement Friday with Brazil, Argentina and the three other South American nations in the Mercosur trade alliance, capping a quarter-century of ...
Oxalyl chloride reacts with water giving off gaseous products only: hydrogen chloride (HCl), carbon dioxide (CO 2), and carbon monoxide (CO). (COCl) 2 + H 2 O → 2 HCl + CO 2 + CO In this, it is quite different from other acyl chlorides which hydrolyze with formation of hydrogen chloride and the original carboxylic acid.
Federal investigators previously said they found two IEDs near the site of the New Orleans truck attack. They also detonated some materials found at a New Orleans Airbnb.