Water → N-Methyl-o-phenylenediamine

HRID 53732

Reaktionsgleichung

Reaktionsgleichung von HRID 53732
[Cl-].[Cl-].[Ca+2].O.FC1C=CC(N)=C(N)C=1.[CH3:14][NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[N+:22]([O-])=O>CCO.CCOCC.[Zn]>[CH3:14][NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[NH2:22]

Komponenten

8

Edukt 4

HCID 962WaterHCID 69157Benzenamine, N-methyl-2-nitro-HCID 1645844-Fluorobenzene-1,2-diamine2×HCID 5284359Calcium Chloride

Produkt 1

HCID 78498N-Methyl-o-phenylenediamine

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 23994ZincKatalysatorHCID 702EthanolLösungsmittel2×HCID 3283Diethyl EtherLösungsmittel

Versuchsvorschrift

N-Methyl-1,2-diaminobenzene was prepared using an adaptation of the method of Tsuji et al. (J. Org. Chem. 55: 580 (1990)). Zn powder (8.07 g, 0.123 mol), CaCl2 (807 mg), H2O (9.9 mL) and 30 mL EtOH were combined and brought to reflux as described for 4-fluoro-1,2-diaminobenzene (see Example 10), and to this mixture was added slowly dropwise a solution of N-methyl-2-nitroaniline (1.50 g, 9.86 mmol) in 15 mL EtOH. Analysis and workup were as described for 4-fluoro-1,2-diaminobenzene except that the reaction residue was dissolved in 50 ml Et2O. This Et2O solution was then extracted with 3×25 mL 1N HCl and the aqueous layers combined and basified with 5 g of 50% NaOH solution. This solution was then extracted with 3×25 mL Et2O. These Et2O layers were then combined, dried (MgSO4) and the solvent evaporated at reduced pressure to yield 911.1 mg (76.1%) of a dark brown oil. 1H NMR (CDCl3) δ 2.87 (s, 3H, CH3), 3.31 (br s, 3H, NH), 6.67 (m, 3H, ArH), 6.86 (m, 1H, ArH).

Aufarbeitung

  1. temperatureto reflux
  2. extractionThis Et2O solution was then extracted with 3×25 mL 1N HCl
  3. extractionThis solution was then extracted with 3×25 mL Et2O
  4. dry with materialdried (MgSO4)
  5. customthe solvent evaporated at reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-af4a0db6aece4b5ca221536e78a44118
Quelldatensatz
uspto-grants-1997_04
Patentnummer
US05620979

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