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tert-Butyl nitrite (TBN)

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A selective C-C bond cleavage of 1,3-diketones affords 1,2-diketones in high yields under mild reaction conditions in air by the use of FeCl3 as the catalyst and tert-butyl nitrite (TBN) as the oxidant without the use of solvent. The possible reaction mechanism is discussed. This protocol provides an expeditious route to useful 1,2-diketones.
L. Huang, K. Cheng, B. Yao, Y. Xie, Y. Zhang, J. Org. Chem., 2011, 76, 5732-5737.

The synthesis of aromatic azides from the corresponding amines is accomplished under mild conditions with tert-butyl nitrite and azidotrimethylsilane. 1,4-Disubstituted 1,2,3-triazoles were obtained in excellent yields from various aromatic amines without the need for isolation of the azide intermediates.
K. Barral, A. D. Moorhouse, J. E. Moses, Org. Lett., 2007, 9, 1809-1811.

Aliphatic and aromatic aldehydes gave acyl azides by reaction with iodine azide at 0 - 25C. If the reaction is performed at reflux Curtius rearrangement occurs and carbamoyl azides are obtained directly from the aldehyde in 70-97% yield.
L. Marinescu, J. Thinggaard, I. B. Thomsen, M. Bols, J. Org. Chem., 2003, 68, 9453-9455.

A wide range of olefins with diverse functionalities has been nitrated in synthetically useful yields in a single step under metal-free conditions. This transformation is operationally simple and exhibits excellent E-selectivity. Furthermore, site selective nitration in a complex setup makes this method advantageous.
S. Maity, T. Naveen, U. Sharma, D. Maiti, Org. Lett., 2013, 15, 3384-3387.

A metal-free C≡C bond cleavage of terminal alkynes in the presence of tBuONO as a powerful nitrogenating agent provides a vast range of nitriles containing aryl, heteroaryl, and natural product derivatives.
U. Dutta, D. W. Lupton, D. Maiti, Org. Lett., 2016, 18, 860-863.

In situ nitrosation of anilines followed by reduction with ascorbic acid to form aryl radicals and thiolation with disulfides provided aryl sulfides. This mild, metal-free synthesis of aryl sulfides proceeded smoothly without heating or irradiation. This strategy can be expanded to the synthesis of aryl selenides.
M.-j. Bu, G.-p. Lu, C. Cai, Synlett, 2015, 26, 1841-1846.