ChemicalBook CAS DataBase List 1H-2-Benzopyran-1,3(4H)-dione,7-methoxy-(9CI)

1H-2-Benzopyran-1,3(4H)-dione,7-methoxy-(9CI) synthesis

14synthesis methods

Product Name:1H-2-Benzopyran-1,3(4H)-dione,7-methoxy-(9CI)
CAS Number:4702-29-8
Molecular formula:C10H8O4
Molecular Weight:192.17

52962-25-1 Synthesis

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1H-2-Benzopyran-1,3(4H)-dione,7-methoxy-(9CI)

4702-29-8
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Yield:4702-29-8 100%

Reaction Conditions:

with acetic anhydride in toluene; for 0.5 h;Reflux;

Steps:

2 Example 2 Preparation of 4-methoxyl homophthalic anhydride (IIIb)

1.1 g (5.2 mmol) of 4-methoxylhomophthalic acid (IIb) was dissolved in 20 ml toluene, and 0.7 ml (7.9 mmol) of acetic anhydride was added. The mixture was heated to the reflux temperature and reacted for 0.5 h. Then, the reaction mixture was cooled to the room temperature and concentrated to dry in a reduced pressure to obtain 1.1 g of a pale yellow solid with the yield of 100%. m.p. 142-143° C

References:

US2013/85140,2013,A1 Location in patent:Paragraph 0041; 0042

52962-25-1 Synthesis

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75-36-5 Synthesis