Take 5 ml of 50%-65% nitric acid, add about 100 mg Urea, cool and add 5 ml isopropanol, NOT LESS!!! [Using the stoichiometric best amount of
isopropanol, here about 2,5 ml, may cause too much heat generating and decomposion of the mixture.] When you cool the solution you prepared after 1-2
hours a isopropyl nitrate-Phase on the acidic solution should have formed.
put about 5 ml HNO3 55% in a test tube, then add urea until you find that it's enough.....you have to find out yourself....then add about 5 ml
isopropyl alcohol and then let the test tube swim in cold water....at first the urea bubbles, ´reacting with the HNO3, and then, after a while, a
thick layer of IPN forms on the acid mix.
Preparation of Isopropyl Nitrite
A mixture of 45 ml concentrated sulfuric acid, 30 ml water and 110 ml isopropyl alcohol, previously cooled to 0 centigrades, was added to an ice cold
solution of 114 grams of sodium nitrite (My edit: I assume they mean nitrate here, not nitrite. What they are calling isopropyl nitrite in this text
has the formula of C3H7ONO2, they use it in the next step to make sodium azide. I've normally seen this called isopropyl nitrate though.) in 450 ml of
H2O. Slow addition required about two hours in order to maintain a temperature around 0 centigrades. The upper oily layer was separated and washed
three times with 30 ml portions of 5 gram 100 ml sodium bicarbonate solution and 22 grams NaCl 100 ml solution respectively.
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