On the Nitrosation ofN-monosubstituted 1-naphthylamines - formation ofN-monosubstituted 4-nitroso-1-naphthylamine derivatives and benzocondensed indaminium salts
摘要:
By nitrosation of the mineralic acid salts of N-monosubstituted 1-naphthylamines (7) N-monosubstituted N'-hydroxy-naphthoquinone diiminium salts (9) are formed. These compounds can condense with their naphthylamine educts 7 to deeply colored N-(4-amino-naphthyl)-substituted naphthoquinone diiminium salts 11 which are available by the reaction of the mineralic acid salts of N-monosubstituted 1-naphthylamines 7 with one half equivalent of nitrous acid in acetic acid solution also. The new indaminium salts 11 absorb, in contrast to their deprotonated species 12 which exhibit intense absorption bands at about 550 nm, in the near infrared region very intensively at about 820 nm.
Synthesis, Characterization and Catalytic Application of MCM 41 Supported Phenanthrolinium Dibromide Catalyst for Aza-Michael Addition Reaction in Aqueous Medium
MCM-41 immobilized phenanthrolinium dibromide (phen-MCM-Br2) was easily prepared and applied as an efficient heterogeneous catalyst for aza-Michael addition of aromatic amines to α,β-unsaturated nitriles and nitro compounds in water. The catalyst was characterized by CHN, TGA, FT-IR, SEM, EDAX, XRD, BET, and TEM. It could be simply recovered and reused several times without significant loss of catalytic
Yttrium nitrate promoted selective cyanoethylation of amines
作者:Arunava Misra、SK Rajibul Haque、Mohabul A Mondal
DOI:10.1007/s12039-023-02173-2
日期:——
various aromatic and aliphatic amines with acrylonitrile at ambient temperature in a protic solvent. The method is selective for the monocyanoethylation of primary aromatic amines, aliphatic secondary amines, and sterically hindered aliphatic amines. Phenols and active methylene compounds do not undergo cyanoethylation. Thiophenol, in the presence of yttrium nitrate, promotes the polymerization of
Yb(OTf)3 and Tb(OTf)3 to give the desired β-aminonitriles, β-amino sulfones, and dimethyl aspartates, respectively, in moderate to excellent yields. The reactions were carried out in toluene for Yb(OTf)3 and in t-BuOMe for Tb(OTf)3, all reactions were performed at 100 °C.
By condensation of bridged 4-arylazo-substituted 3-hydroxyanilines 18 and bridged or unbridged 4-arylazo-substituted 1-naphthylamines 19-23 with bridged 1-naphthylamines 15-17 and 3-aminophenols 14, respectively, in the presence of perchloric acid, bridged naphthoxazinium perchlorates 24-30 have been prepared. The spectral properties of the products have been compared with those of the bridged phenoxazinium salt 31 as well as with data for some unbridged analogues.
40. Experiments on the synthesis of aza-steroids. Part I