Reaktion #697802

Reaktionsgleichung

4,4-di-(2-tolyl)-1-butyl acetate

water

iodic acid

→

title compound 34a

4,4-Di-(2-tolyl)-1-butyliodide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturunder reflux for 3 hrs
2. 2
   Extraktionthe aqueous phase was extracted with diethyl ether
3. 3
   WaschenThe combined organic phases were washed with water
4. 4
   Trocknena saturated aqueous solution of NaCl, dried (Na2SO4)
5. 5
   Sonstigeevaporated in vacuo

Vorschrift

The crude 2,2-di-(2-tolyl)-tetrahydrofuran 33a (28 g) was dissolved in acetic acid (250 mL). 5% palladium on Carbon black (3 g) was added and the mixture was hydrogenated in a Parr apparatus at 3 ato at 55° C. for 5 hrs. The catalyst was filtered off and the solvent was evaporated in vacuo. The remaining oil was subjected to CC (n-heptane/ethyl acetate--15:1) to give 4,4-di-(2-tolyl)-1-butanol (17 g). A solution of 4,4-di-(2-tolyl)-1-butanol (19 g) in acetic acid (400 mL) was boiled under reflux for 3 hrs. The cooled solution was evaporated in vacuo to give 4,4-di-(2-tolyl)-1-butyl acetate (17 g) as an oil. A solution of 4,4-di-(2-tolyl)-1-butyl acetate (9.2 g) in 57% aqueous iodic acid (150 mL) was boiled under reflux for 3 hrs. The cooled solution was poured into a mixture of ice and water and the aqueous phase was extracted with diethyl ether. The combined organic phases were washed with water and a saturated aqueous solution of NaCl, dried (Na2SO4) and evaporated in vacuo to give the title compound 34a (11.7 g) as an oil, which was used without further purification. 1H NMR (CDCl3) δ1.80-2.10 (m,4H), 2.28 (s,6H), 3.17 (t,2H), 4.26 (t,1H), 7.12 (s,8H)

Quelle