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dlyy8069
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6Â¥2009-09-27 15:11:09
ldl2008
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2Â¥2009-09-27 10:44:39
cherry5592
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ÅÓÑ©(½ð±Ò+2,VIP+0): 9-30 09:21
ÅÓÑ©(½ð±Ò+2,VIP+0): 9-30 09:21
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3Â¥2009-09-27 13:32:04
cherry5592
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ÅÓÑ©(½ð±Ò+4,VIP+0): 9-30 09:22
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A High-Yield Method for the Methylenation of o-Dihydroxyaromatic Compounds: Synthesis of Methylenedioxycoumarins P. Castillo*, J. C. Rodriguez-Ubis, F. Rodriguez *Departamento de; Qu¨ªmica Org¨¢nica, Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid, Spain Reaction of o-dihydroxycoumarins and catechols with sodium hydride in hexamethylphosphoric triamide and dihalomethane provides the corresponding methylenedioxy compounds under mild conditions and in excellent yields. ÄãÕÒÕâ¸öÎÄÕ |

4Â¥2009-09-27 13:34:36













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