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Testosterone chloroformate was prepared as follows. To a solution of testosterone (2 g, 7.0 mmol) dissolved in tetrahydrofuran (50 ml) was added a 1.93M solution of phosgene in toluene (33 ml). The resulting solution was stirred for 4 h at room temperature, concentrated under vacuum, and the resulting residue vacuum dried for approximately 30 minutes (2.88 g).

1. concentrationconcentrated under vacuum
2. customthe resulting residue vacuum dried for approximately 30 minutes (2.88 g)