反应详情

An alternative procedure is as follows: 4-toluenesulfonic acid monohydrate (51.3 g) in acetone (275 ml) was stirred with 2,2-dimethoxy propane (75 ml) and toluenesulfonic acid monohydrate (1.3 g) for 18 hours at room temperature, and worked up in a similar manner as indicated in the procedure above to afford 52.12 g (76% yield), b.p. 72-75° C./0.65 mm Hg. Mass spec: m/z 161 (M++1). Anal Calcd for C8H15O3: C, 59.98; H, 10.07%. Found: C, 59.62; H, 10.07%. 1H NMR (CDCl3) δ ppm: 0.83 (s, 3H), 1.40 (s, 3H), 1.44 (s, 3H), 3.59-3.69 (m, 6H). 13C NMR: 17.69, 20.25, 27.41, 34.86, 65.90, 66.43, 98.1 (7 sp3C).

1. customto afford 52.12 g (76% yield), b.p. 72-75° C./0.65 mm Hg