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0 °C

Crotonoyl chloride (21.35 g) in dichloromethane (100 mL) was charged into a 2-L reaction flask and cooled to 0° C. 3-Methyl-butan-2-ol (18 g) was added followed by diisopropylethylamine (31.7 g). The reaction mixture was aged at 0-10° C. for about 30 minutes and poured into dilute hydrochloric acid (33 g in 170 g water). Hexanes were added and the aqueous and organic layers were split. The organic layer was separated and subsequently purified via liquid chromatography to provide but-2-enoic acid 1,2-dimethyl-propyl ester (25.6 g).

1. customthe aqueous and organic layers were split
2. customThe organic layer was separated
3. customsubsequently purified via liquid chromatography