Acetic Acid → HCID 59638321, Verbindung

In a 250 mL three neck bottle magnesium turnings (5.2 g, 214 mmol, 2.35 eq.) are mixed with tetrahydrofuran (10 ml). Whilst stirring 5-(bromomethyl)-bicyclo[2.2.1]hept-2-ene (17 g, 90.8 mmol, 1.03 eq.) that is dissolved in tetrahydrofuran (25 ml) is added dropwise. After stirring for one hour the excess of magnesium turnings is filtered off. The solution is added dropwise to a mixture of 1,3-dibromopropan (17.9 g, 88 mmol, 1 eq.), Li2CuCl4 (0.1 M in THF) (9 ml, 0.9 mmol, 0.01 eq.) and tetrahydrofuran (35 ml). After complete addition of the Grignard reagent, the black solution is stirred for one hour more. The reaction mixture is hydrolyzed with acetic acid (20%). Diethylether (40 ml) is added and the organic phase is washed with saturated sodium hydrogencarbonate solution (30 ml) and distilled water (30 ml). The organic layer is dried over magnesium sulfate and the solvent evaporated in vacuo at room temperature. The product is distilled at 20 mbar and 140° C. A colourless oil is obtained (Yield: 10.31 g, 45 mmol, 51%).

1. additionis added dropwise
2. filtrationis filtered off
3. washthe organic phase is washed with saturated sodium hydrogencarbonate solution (30 ml)
4. distillationdistilled water (30 ml)
5. dry with materialThe organic layer is dried over magnesium sulfate
6. customthe solvent evaporated in vacuo at room temperature
7. distillationThe product is distilled at 20 mbar and 140° C
8. customA colourless oil is obtained (Yield: 10.31 g, 45 mmol, 51%)

ORD-Eintrag

ord-3ffaeb1136d74718b5d4f0c3e9915362

Quelldatensatz

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08883872B2