Trichloroacetyl chloride → 1,1-Dichlorospiro[3.5]nonan-2-one

Participants

Reaction Steps

This was prepared according to a literature procedure (Tetrahedron 1993, 49(36), 8159). Activated zinc (5.00 g; 76.5 mmol) (prepared according to Example 150, Step B) and methylenecyclohexane (2.40 g; 25.0 mmol) in dry ether (100 mL) under nitrogen were mixed in a 250 mL 3-neck flask with an addition funnel and condenser attached. The mixture was placed in a sonic bath at 25° C. Trichloroacetyl chloride (5.91 g; 32.5 mmol) in dry ether (50 mL) was added dropwise as the solution was sonicated. The sonication was continued for 3 hours. The mixture was filtered through Celite® and the solution was washed with saturated aqueous ammonium chloride solution (50 mL) and aqueous sodium bicarbonate solution (50 mL). The solution was dried (sodium sulfate), filtered and concentrated under reduced pressure. The residue was passed through a plug of silica gel using ether. The filtrate was evaporated to give the product as a yellow oil (5.03 g).

Provenance & Evidence