Isocyanatoquinones

Nitropyridyl Isocyanates.

“…Standard phosgene reaction or alternatively oxalyl chloride [7] reaction of 2-amino-5-nitropyridine (22) failed to give 5-nitro-2-pyridyl isocyanate (18), as shown in Scheme 3. The reactions yielded several other products depending on the reagent.…”

“…This compound was prepared from 3-nitropyridine-4-carbonylhydrazide (7) by diazotization according to the literature [3]. The product which was pure by 1 H nmr was kept under N 2 atmosphere in the freezer in an approx.…”

Synthesis and Chemistry of CF3C6F4OC6F4NH2 (RFNH2) and Pseudohalogen Derivatives; Crystal Structures of RFX (X = COOH, COCl, CN, N3, NCS, NHCOCONHRF)

“…According to a literature procedure [5] some amino-striazines are converted into the corresponding isocyanates with oxalyl chloride by CO elimination. According to a literature procedure [5] some amino-striazines are converted into the corresponding isocyanates with oxalyl chloride by CO elimination.…”

“…The remaining residue after removal of the solvent was sublimed at 35°C/0.01 Torr to give pale yellow crystals of the azide CF 3 C 6 F 4 OC 6 F 4 N 3 (5). Diazotation of 4 and reaction with azide.…”

The Convenient Synthesis of Hydrogen‐Bonded Ureidopyrimidinones

“…[3,5] Furthermore, for the synthesis of multifunctional UPy derivatives, adding an excess of isocytosine isocyanate to a linker with multiple amino groups to ensure complete functionalization is a conceptually better strategy. Unfortunately, the isocyanate of isocytosine cannot be synthesized as was shown by Gizycki, [6] who showed that in attempts to form the isocyanate of pyridines and pyrimidines with diphenyl carbonate, dimeric ureas were obtained. In our attempts to form the isocyanate of isocytosine by phosgenation, only a covalent dimer could be isolated as shown in Scheme 1.…”