Feb 12, 2024 · Acetic anhydride is a colorless organic liquid with the formula (CH 3 CO) 2 O and the simplest example of a carboxylic acid anhydride (the simpler formic anhydride is too unstable to exist as pure substance).

Sep 12, 2010 · Yield of the crude Ac2O will be ~30 mL. E. Simple Distillation Set up for simple distillation of the crude Ac2O at atmospheric pressure. Use a 50 mL RBF as pot. Collect 2 cuts. The first cut (~15 mL) will come over at about 128-135°C. The 2nd cut (~10 mL) will come over at 135-143°C. Literature value for the bp of Ac2O is 140.0 °C.

Jul 8, 2008 · And it is a large multiple of the MW of Ac2O. Actually it takes c 80% (224 g vs 284 g) the mass (not molar mass) of acetic anhydride to convert the morphine base. So we are talking 160 MT Ac2O to convert the entire annual morphine base produced.. That is out of the worldwide production of about 2 million MT Ac2O. QED. To summarize: 1.

May 11, 2002 · simple HMX-synth without Ac2O Its sometimes cool what you can find while looking for something completely different, initially... US 2678927 tells us about how hmx can be made in a very simple manner via: hexamine dinitrate --90% H2SO4--> DPT 30% yield and in Example 9: DPT can then be nitrated by means of 99% nitric acid to give HMX in unknown ...

oxalyl chloride prep. with Ac2O and Cl2 ? I´ve an idea as follows: Is it possible to obtain oxalic dichloride by mixing anhydrous acetic acid and oxalic acid, heat the mixture and then passing chlorine gas into it?

Jul 5, 2011 · Slowly pouring the Ac2O in, at first there was no reaction. More Ac2O added, then the solution slowly started bubbling just a tiny bit, and continued bubling ever so slightly for several minutes despite no additional Ac2O being added, as if it were a self-sustaining reaction.

Subject: Seperation of AcOH and Ac2O: Sauron. International Hazard. Posts: 5351 Registered: 22-12-2006

Mar 1, 2004 · the methods involving HNO3 and Ac2O are the Bachmann's method and method KA. both use hexamine dinitrate, ammonium nitrate, Ac2O and concentrated HNO3. very interesting ways if you can get hold of Ac2O - little usage of conc. HNO3 and high yields forget about method E - low yield and dangerous without BF3

Jul 5, 2005 · Formation of Ac2O takes place also in mixts. with air but the yield is smaller than with the pure N2O4. The Ac2O yield is 85%. The N2O4 was prepd. either by strongly heating Pb (NO3)2 or from nitrosylsulfuric acid and NaNO3 according to the equation: HOSO2ONO + NaNO3 = NaOSO2OH + N2O4.

In my opinion there are a dozen better ways to make Ac2O than using POCl3, it is precious stuff. I listed these upthread. I'm not sure what the reaction time is. It sounds like, with NaCl, the volatile products start distilling off as reaction commences c. 250 C.