- Amide exchange reaction: A simple and efficient CuO catalyst for diacetamide synthesis
-
A highly copper-catalysed amide exchange reaction of hexamethylenediamine (HDA) with CH3CN and H2O for the synthesis of hexamethylenebisacetamide (HMBA) without an organic solvent or gas protection was developed. 100% HDA conversion and >99% HMBA selectivity was obtained. X-ray diffraction, scanning emission microscopy, and temperature-programmed reduction of hydrogen were used to characterize the structural properties of the catalyst. The reaction mechanism was also investigated.
- Li, Qinghe,Wang, Peixue,Deng, Youquan
-
p. 40890 - 40894
(2016/05/19)
-
- NITRO DERIVATIVES OF AROMATIC AZOXY COMPOUNDS. PART I. 2,2'- AND 4,4'-DIMETHYLAZOXYBENZENE NITRATION PRODUCTS
-
By nitration of 2,2'-dimethylazoxybenzene (1) with concentrated nitric acid under conditions of increasing severity we obtained in succession nitro derivatives having their nitro groups in position: 4; 3',4 and 2,3',4.From 4,4'-dimethylazoxybenzene (2) we obtained similar products with nitro groups in positions: 2,3' (plus 2,6-isomer) and 2,3',6.Trinitro derivatives were obtained also by nitration of dinitro compounds, while tetranitro derivatives: 2,3',4,5' and 2,3',5',6 were obtained by nitrating trinitro compounds (in the presence of phosphoric acid).By reduction with stannous chloride in a strongly acidic medium we obtained, parallel to monocyclic aromatic amines and the conventional benzidine rearrangement products, also 4,4'-dimethyl-2,3'-diaminoazoxybenzene from dinitro derivative 2b, and 3,3'-dimethylbenzidine from mononitro derivative 1a, the latter being quite unexpected.
- Urbanski, Jerzy,Wolak, Ireneusz
-
p. 1035 - 1045
(2007/10/02)
-