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Answers : The Hindu
Category:Horoscopes
Category:Vedic astrologya) Field of the Invention
The invention is directed to a process for the preparation of 2-[(1-phenylethoxy)methyl]-4,5-benzoxazin-3-on-4-one by reacting 2-phenylethylhydrazine and methylamine and, if appropriate, a solvent according to the invention.
b) Description of the Prior Art
WO 96/24375 describes the preparation of 2-[(1-phenylethoxy)methyl]-4,5-benzoxazin-3-on-4-one by reacting 2-phenylethylhydrazine with methylamine in the presence of an acid, the methylamine compound being isolated, for example, by means of azeotropic distillation.
It is an object of the present invention to provide an improved process for the preparation of 2-[(1-phenylethoxy)methyl]-4,5-benzoxazin-3-on-4-one.
We have found that this object is achieved by a process according to the invention.
In accordance with the present invention, therefore, the benzoxazin-3-on-4-one of the formula (I) is obtainable by reacting a benzoxazin-3-on-4-one of the formula
in which
R1 is phenyl, phenoxy, phenylthio, phenylalkoxy or phenylalkylthio,
R2 is hydrogen,
R3 is hydroxyl or alkoxy,
R4 is hydrogen or alkyl, or R3 and R4 together form a bond,
with a compound of the formula
in which
R5 is phenyl, phenoxy, phenylthio, phenylalkoxy or phenylalkylthio,
R6 is hydrogen or alkyl, and
n is 1, 2 or 3,
in which the abovementioned variables have the following meanings:
R1 is phenyl, phenoxy, phenylthio, phenylalkoxy or phenylalkylthio and R2 is hydrogen,
R3 is hydrox https://awinkiweb.com/wp-content/uploads/2022/06/broothro.pdf
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