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Isomeric of 5-methoxy-4, 8, 8-trimethyl-2 H, 8 H-benzo[1, 2-b: 5, 4-b']dipyran-2-one [1] and 5-methoxy-2, 2, 10-trimethyl-2H, 8H-benzo[1, 2-b: 3, 4-b']dipyran-8-one [2] were synthesized by reduction of the dihydropyranone ring of 4-methylcoumarin derivatives with sodium borohydride, followed by dehydration of the corresponding alcohol.<BR>The 1H NMR chemical shifts of aromatic protons of 4-methylcoumarin derivatives exhibited the trend similar to those observed in the case of 4-phenylcoumarin derivatives; each chemical shift of aromatic protons of the linear isomers appeared at a field lower (0.17∼0.27 ppm) than, those of the angular isomers.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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