反应详情

A solution of 14.4 g (100 mmol) of 2,2-dimethylhexanoic acid (XXIX) in 100 ml of dry ether was stirred a 0° C. under argon as 130 ml (237 mol) of a solution of methyllithium (1.82 M) in ether was added dropwise. The resultant mixture was stirred with ice-bath cooling for 1 hour and then without cooling overnight. It was then poured into a vigorously stirred 500 ml portion of water in a large beaker. The phases were separated and the aqueous phase was back-extracted twice with ether. The combined extract was dried (MgSO4) and evaporated in vacuo. The residue was distilled at 20 mm to yield 12.7 g of XXX as a colorless oil, bp 125°-130°; Rf (CHCl3) 0.54; nmr 0.9 (3, broad t, J=6.0 Hz), 1.12 (6, s), 1.0-1.8 (6, m) and 2.14 (3, s); ir (film) 8.85, 7.45, 6.80, 5.85, 3.50, 3.41 and 3.38μ.

1. additionwas added dropwise
2. temperaturecooling for 1 hour
3. temperaturewithout cooling overnight
4. customThe phases were separated
5. extractionthe aqueous phase was back-extracted twice with ether
6. extractionThe combined extract
7. dry with materialwas dried (MgSO4)
8. customevaporated in vacuo
9. distillationThe residue was distilled at 20 mm