1-Thiophen-2-yl-cyclohept-4-enecarboxylic acid ethyl ester → 1-Thiophen-2-yl-cycloheptanecarboxylic acid ethyl ester

Participants

Reaction Steps

1-Thiophen-2-yl-cyclohept-4-enecarboxylic acid ethyl ester (Example 5b) (2.86 g) was dissolved in ethanol (30 mL) and tris(triphenylphosphine)rhodium(I) chloride (0.100 g) was added. The reaction mixture was stirred rapidly under 5 atmospheres of hydrogen overnight. Further tris(triphenylphosphine)rhodium(I) chloride (0.050 g) was added and the reaction mixture was stirred under 5 atmospheres of hydrogen for 3 days. A third addition of tris(triphenylphosphine)rhodium(I) chloride (0.050 g) was made and the reaction mixture was stirred under 3 atmospheres of hydrogen overnight. The contents were evaporated to dryness and purified on silica eluting with ethyl acetate/isohexane (5/ 95) to afford the sub-titled compound (2.500 g) as a clear almost colourless oil

Provenance & Evidence