Реакция #355587

Уравнение реакции

trimethylhydroquinone

2-methoxybutadiene

H2SO4

methyl vinyl ketone

3-ketobutanol

3,3-dimethoxybutene

trimethyl orthoformate

4-methoxy-2-butanone

→

(±)-6-hydroxy-2-methoxy-2,5,7,8-tetramethylchroman

Растворители

methanol

Условия реакции

Обработка

1. 1
   Другоеdried in the manner of Example 1

Методика

In the manner described in Example 1, 3.80 g (25 mmol) samples of trimethylhydroquinone were treated in 25 ml of methanol, 5.0 ml of trimethyl orthoformate, and 0.10 ml of 36 N aqueous H2SO4 with 50 mmole portions of the following methyl vinyl ketone substitutes: a, 2-methoxybutadiene; b, 3-ketobutanol; c, 3,3-dimethoxybutene (contaminated with about 20 percent 2-methoxybutadiene); and d, 4-methoxy-2-butanone. The reactions were monitored by tlc. Reactions a,c and d were complete after 24 hr and were worked up and dried in the manner of Example 1 to give (±)-6-hydroxy-2-methoxy-2,5,7,8-tetramethylchroman. In reaction b, a>50 percent conversion to (±)-6-hydroxy-2-methoxy-2,5,7,8-tetramethylchroman was indicated by tlc.

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