http://kawbtpskqu7rr3t6ecz4fyutpzq7jtblin3wv5vamneryu4nwenhkgyd.onion/mediawiki/index.php?title=Urba%C5%84ski,_Tadeusz&action=edit
For example, he condensed nitroethane with two equivalents of formaldehyde in the presence of sodium hydrogen carbonate to form a nitrosubstituted glycol. In its absorption spectrum, the typical band for nitro groups at 270 nm is missing, which suggests the formation of hydrogen bonds with the participation of the nitro group. Under the action of alkali a retro-aldole condensation takes place with the elimination of formaldehyde.