Oxalyl chloride → 2-(5-t-Butylthiophen-2-yl)-cyclopropanecarbonyl chloride
Reaction equation
[C:1]([C:5]1[S:9][C:8]([CH:10]2[CH2:12][CH:11]2[C:13]([OH:15])=O)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].C(Cl)(=O)C([Cl:19])=O>CCCCCC>[C:1]([C:5]1[S:9][C:8]([CH:10]2[CH2:12][CH:11]2[C:13]([Cl:19])=[O:15])=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 2-(5-t-butylthiophen-2-yl)-cyclopropanecarboxylic acid (3.38 g, 0.015 mol) and oxalyl chloride (2.65 g, 0.021 mol) in hexane (35 ml) was stirred at room temperature for 2 hours and then warmed at 60° C. for 3 hours. The hexane and excess oxalyl chloride were removed in vacuo to give 2-(5-t-butylthiophen-2-yl)-cyclopropanecarbonyl chloride (3.59 g, 99%) as a pale yellow liquid which was used in the next stage without further purification.