Hexane → 3-Decynoic acid

HRID 1073858Notes

Reaction equation

HRID 1073858 reaction equation
[C:1]([OH:6])(=[O:5])[CH2:2][C:3]#[CH:4].C([Li])CCC.[CH3:12][CH2:13][CH2:14][CH2:15][CH2:16][CH3:17].ICCCCCC>O1CCCC1.CN(C)P(=O)(N(C)C)N(C)C>[C:1]([OH:6])(=[O:5])[CH2:2][C:3]#[C:4][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH3:17]

Participants

7

Reactant 4

HCID 8058HexaneHCID 125271-IodohexaneHCID 1375473-Butynoic AcidHCID 178418339Butyllithium

Product 1

HCID 5493723-Decynoic acid

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent3×HCID 12679HexamethylphosphoramideSolvent

Conditions

Temperature
0 °C

Procedure

To 6.8 g (70 mmol) of 3-butynoic acid dissolved in 150 ml of 1:1 tetrahydrofuran (THF):hexamethyl phosphoric triamide (HMPA) and cooled to -20° C. is added via syringe a solution of n-butyl lithium in hexane (1.6N, 2 equiv). The mixture was allowed to warm to 0° C. The mixture is stirred for 30 minutes at this temperature and then 150g (1.1 equiv) of 1-iodohexane is added dropwise as a solution in 20 ml of THF. The mixture is allowed to warm to room temperature and then is partitioned between ether and water. The aqueous layer is acidified with 3N H2SO4 and extracted with ether. The combined organic extracts are washed with brine and dried (Na2SO4). Evaporation of the volatiles in vacuo and chromatography of the crude on silica gel (ethyl acetate/hexane/acetic acid; 10:90:0.1) affords 4.5 g of pure 3-decynoic acid.

Workup

  1. temperatureto warm to room temperature
  2. customis partitioned between ether and water
  3. extractionextracted with ether
  4. washThe combined organic extracts are washed with brine
  5. dry with materialdried (Na2SO4)
  6. customEvaporation of the volatiles in vacuo and chromatography of the crude on silica gel (ethyl acetate/hexane/acetic acid; 10:90:0.1)

Sources & evidence

ORD record
ord-3acacffc642e4b8e95c86e5ca028067c
Source dataset
uspto-grants-1990_11
Patent number
US04971997

Reaction notes

Loading…