16582-88-0

Upstream product

• 653-22-5 1-Acetylamino-2,3,4,5,6-pentafluorobenzen 
• 771-60-8 2,3,4,5,6-pentafluoroaniline 
• 5580-80-3 2,3,4,5-tetrafluoroaniline 
• 108-24-7 acetic anhydride 

Downstream Products

• 5580-80-3 2,3,4,5-tetrafluoroaniline 
• 111721-75-6 2-bromo-3-fluoroaniline 
• 6157-98-8 2,3,4,5-tetrafluoro-6-nitroaniline 
• 2993-07-9 3,4,5,6-tetrafluoro-benzene-1,2-diamine 
• 16582-87-9 1,2,3,4-tetrafluoro-5,6-dinitrobenzene 
• 16582-89-1 2.3.4.5-Tetrafluor-6-nitro-acetanilid 

Relevant academic research and scientific papers

Synthesis and conformational analysis of N-aryl-N-(3-thienyl)acetamides

The cis-trans conformational equilibrium of amides is of interest because it can be used to control functional activity. Here, we designed and synthesized a series of N-(3-thienyl)amides in order to study the factors affecting their conformational equilibrium. NMR studies showed that the major conformer of N-methyl-N-(3-thienyl)amide in solution is the E-form (cis form), as is the case for N-methylacetamide. For N-aryl-N-(3-thienyl)amides bearing an N-phenyl moiety, the major conformers differ depending on not only the relative π-electron density of the N-aryl moiety, but also its size. X-ray analysis showed that their solid-state conformational preferences were similar to those in solution.

Conformational analysis of N-aryl-N-(2-azulenyl)acetamides

Aromatic amides bearing 2-azulenyl group on the amide nitrogen were synthesized and their structures were investigated. The π-electron density of the N-aryl group was found to influence the cis-trans conformational preferences of these compounds in solution. X-ray crystallography revealed that the plane of the 2-azulenyl ring has a strong tendency to lie coplanar with the amide plane when the azulene group is located on the same side as the amide oxygen atom.

Interaction of polyfluorinated 2-chloroquinolines with ammonia

We have studied the interaction of polyfluorinated (in the benzene moiety) 2-chloroquinolines with liquid and aqueous ammonia as an approach to the synthesis of halogen-containing aminoquinolines. 5,7-Difluoro-, 5,6,8-trifluoro-, and 5,7,8-trifluoro-2-chloroquinolines mostly form products of substitution of the Cl atom, whereas 5,7-difluoro-2,6-dichloroquinoline, 5,6,7,8-tetrafluoro-, and 6,7-difluoro-2-chloroquinolines yield products of substitution of an F atom at various positions. The replacement of liquid ammonia with aqueous causes an increase in the proportion of the products of aminodechlorination relative to the products of aminodefluorination. For 2-chloro-6,8-difluoroquinoline this replacement leads to 2-amino-6,8-difluoroquinoline as the main product instead of the 8-amino-derivative. Activation energy values estimated by DFT calculations for the reactions in question agree with the reaction regioselectivity observed experimentally.

Activation of C-F bonds in ionic liquids catalyzed by nickel complex compounds

A nickel complex-catalyzed hydrodefluorination of acet(pentafluoroanilide) with zinc in ionic liquids resulted in the corresponding 2,3,4,5-tetrafluoro, 3,4,5-trifluoro, and 3,4-difluoro derivatives. The influence of the ionic liquid nature and the reaction conditions on its selectivity were studied, a possibility of the multiple reuse of the ionic liquids as the reaction media was demonstrated.

Hydrodefluorination of N-acetylheptafluoro-2-naphthylamine by zinc in aqueous ammonia: Synthetic outcomes and mechanistic considerations

Reduction of the N-acetyl derivatives of heptafluoro-2-naphthylamine and its less fluorinated analogues by zinc in aqueous NH3 has been investigated as a possible general and concise route to partially fluorinated N-(2-naphthyl)acetamides and, accordingly, 2-naphthylamines inaccessible by other ways. Quantum chemical calculations and CV measurement results have been used to discuss and justify the suggested reaction mechanism including two competing routes: fragmentation of a substrate radical anion and its complex with a zinc cation. ARKAT-USA, Inc.

Reaction of pentafluoroacetanilide with zinc catalyzed by nickel complexes

The reaction of pentafluoroacetanilide hydrodefluorination under the action of zinc in the presence of catalytic amounts of complexes, generated in situ from nickel chloride and 2,2′-bipyridine or 1,10-phenanthroline, was studied. The influence of the sol

N-acetylation as a means to activate polyfluoroarylamines for selective ortho-hydrodefluorination by zinc in aqueous ammonia: A concise route to polyfluorobenzo azaheterocycles

N-Acetylation of polyfluoroarylamines is proposed as a means to remove the amino group blocking effect of their hydrodefluorination by zinc in aqueous ammonia. With pentafluoroacetanilide, the Zn ion specific effect has been demonstrated to be responsible for ortho hydrodefluorination. This regiochemistry is accompanied by the removal of a fluorine atom from the para position, which occurs predominantly in the initial phase of the process in the absence of deliberately added zinc salt. The CuCl2 additive has been found to accelerate the reaction and to propel it to double defluorination. Quantum chemical calculations suggest a diminished electron affinity of pentafluoroaniline, which is responsible for its inertness in relation to the hydrodefluorination reaction. The pentafluoroaniline radical anion, which essentially has a nonplanar structure, is prone to easy fragmentation to give an aminotetrafluorophenyl radical. For pentafluoroacetanilide, CVA experiments and quantum chemical calculations predict that the pentafluorophenyl moiety serves as the electron receptor and that the acetamido group is twisted out of coplanarity with the benzene ring; thus, together with the electron-withdrawing effect of the acetyl group, the amino group blocking effect is suppressed. On this ground, the selective ortho hydrodefluorination of polyfluoroacetanilides is developed as an important protocol for the expeditious and general synthesis of polyfluorobenzo azaheterocycles via readily accessible polyfluoroarylamines from base polyfluoroarenes. Its applicability has been illustrated by preparing quinolines that possess a polyfluorinated benzene moiety by the Skraup synthesis utilizing crude polyfluoroacetanilide hydrodefluorination products as starting materials. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.

A new approach to polyfluoroaromatic amines with an unsubstituted position ortho to the amino group

N-acetyl derivatives of polyfluoroaromatic amines have been found to be highly selectively defluorinated by zinc in aqueous ammonia at the position ortho to the acetamido group thus affording a new approach to potential building blocks for the synthesis o

Substituted 1,3,4,9-tetrahydropyrano [3,4-B]indole-1-acetic acids

Indole derivatives characterized by having a 1,3,4,9-tetrahydropyrano[3,4-b]indole-1-acetic acid nucleus bearing a substituent in position 1-, 4-, 5-, 6-, 7- and 8- are disclosed. The derivatives are useful anti-inflammatory and analgesic agents and methods for their preparation and use are also disclosed.