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the case of ketones, the formation of dioxolanes is very slow even in DME, and therefore, DME can be employed as a solvent for the catalytic pinacol coupling to give 1,2-diol. On the other hand, the catalytic pinacol coupling reaction in THF at temperatures over 45 °C was accompanied by a ring opening reaction of THF
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In the case of ketones, the formation of dioxolanes is very slow even in DME, and therefore, DME can be employed as a solvent for the catalytic pinacol coupling to give 1,2-diol. On the other hand, the catalytic pinacol coupling reaction in THF at temperatures over 45 °C was accompanied by a ring opening reaction of THF.
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The same reaction at 20 °C provided 52% (R-Me/β-Me) 60/40) of 5 (trans-isomer) with the formation of its cis-isomer (ca. 20%
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The same reaction at 20 °C provided 52% (R-Me/β-Me) 60/40) of 5 (trans-isomer) with the formation of its cis-isomer (ca. 20%).
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