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ChemicalBook CAS DataBase List Menadione

Menadione synthesis

6synthesis methods
Menadione can be prepared by oxidizing 2-methylnaphthalene with chromic acid or hydrogen peroxide.
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Yield:58-27-5 100%

Reaction Conditions:

with dihydrogen peroxide;glacial acetic acid in lithium hydroxide monohydrate at 75; for 5 h;Product distribution / selectivity;

Steps:

1

EXAMPLE 1[18] A solution of 2-methylnaphthalene (5 gr, 35.2 mmol) in glacial acetic (40,5 ml, 0.703 mol) acid is heated to 75 °C under stirring. After reaching to 75 °C, hydrogen peroxide (30%) is added in 3 minutes and the resulting mixture is stirred for further 5 hours at 75 °C. The reactions are analyzed using GC, GC-MS and NMR. Different molar ratios of 2-methylnaphthalene and hydrogen peroxide (30%) are studied. The results of the conversion and selectivity are given in Table 1.

References:

WO2012/28905,2012,A1 Location in patent:Page/Page column 5

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