Formic anhydride can be isolated by low-temperature, low-pressure distillation, but decomposes on heating above room temperature. It decomposes into formic acid and carbon monoxide. The decomposition of formic anhydride may be catalyzed by formic acid. Formic anhydride can be detected in the gas-phase reaction of ozone with ethylene. The molecule is planar in the gas phase. Formic anhydride Formic anhydride, also called methanoic anhydride, is an organic compound with the chemical formula and a structural formula of (H(C=O)−)O. It can be viewed as the anhydride of formic acid (HCOOH). Formic anhydride can be obtained by reaction of formyl fluoride with sodium formate
Adenosylcobyric acid synthase (glutamine-hydrolysing) metabolism. Adenosylcobyric acid synthase (glutamine-hydrolysing) In enzymology, an adenosylcobyric acid synthase (glutamine-hydrolysing) () is an enzyme that catalyzes the chemical reaction The 4 substrates of this enzyme are ATP, adenosylcobyrinic acid a,c-diamide, L-glutamine, and HO, whereas its 4 products are ADP, phosphate, adenosylcobyric acid, and L-glutamate. This enzyme belongs to the family of ligases, specifically those forming carbon-nitrogen bonds carbon-nitrogen ligases with glutamine as amido-N-donor. The systematic name of this enzyme class is adenosylcobyrinic-acid-a,c-diamide:L-glutamine amido-ligase (ADP-forming). Other names in common use include CobQ, cobyric acid synthase, 5'-deoxy-5'-adenosylcobyrinic-acid-a,c-diamide:L-glutamine, amido-ligase, and Ado-cobyric acid synthase [glutamine hydrolyzing]. This enzyme participates in porphyrin and