Water → 1,1-Dicyanocyclopentane

HRID 264049

Reaction equation

HRID 264049 reaction equation
[H-].[Na+].[C:3](#[N:7])[CH2:4][C:5]#[N:6].Br[CH2:9][CH2:10][CH2:11][CH2:12]Br.O>CN(C)C=O>[C:5]([C:4]1([C:3]#[N:7])[CH2:12][CH2:11][CH2:10][CH2:9]1)#[N:6]

Participants

6

Reactant 4

HCID 962WaterHCID 8010MalononitrileHCID 80561,4-DibromobutaneHCID 24758Sodium hydride

Product 1

HCID 151720351,1-Dicyanocyclopentane

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent2×

Procedure

Sodium hydride (37.8 g; 0.94 moles) was suspended in dimethylformamide (250 mL) under an atmosphere of N2. A solution of malononitrile (30 g; 0.45 moles) and 1,4-dibromobutane 99.7 g; 0.45 moles) in dimethylformamide (150 mL) was added dropwise at such a rate so as not to exceed 30° C. The mixture was stirred for overnight, poured into H2O (500 mL), and then washed with two portions of ethyl ether. The organics were combined, washed with brine, and dried over magnesium sulfate. The drying agent was removed by filtration and the filtrate was concentrated in vacuo, leaving a bilayered liquid. The lower portion was separated (28.8 g) and identified as the desired product.

Workup

  1. customto exceed 30° C
  2. washwashed with two portions of ethyl ether
  3. washwashed with brine
  4. dry with materialdried over magnesium sulfate
  5. customThe drying agent was removed by filtration
  6. concentrationthe filtrate was concentrated in vacuo
  7. customleaving a bilayered liquid
  8. customThe lower portion was separated (28.8 g)

Sources & evidence

ORD record
ord-3764906f1ab348f6bd1bcd3e514095c1
Source dataset
uspto-grants-1997_07
Patent number
US05646170

Linked notes

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