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11844274359
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note
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In the course of our study on asymmetric desymmetrization of meso-diols using (ON)Ru(salen) complexes as catalysts, we found that the nature of the apical ligands of the complexes affects the selectivity of the reaction (Ref. 8b)
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41
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11844256717
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note
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3,5-Di(1-ethyl-1methylpropyl)-2-hydroxybenzaldehyde was prepared from phenol in five steps: (i) treatment of phenol with 3-methyl-2-pentene (1 equiv) in the presence of HY zeolite (30 wt%) at 80°C (95%), (ii) treatment of the resulting 5-(1-ethyl-1methylpropyl)phenol with 3-methyl-2-pentene (0.35 equiv) in the presence of HY zeolite (30 wt%) at 80°C (85% based on 3-methyl-2-pentene used), (iii) protection of 3,5-di(1-ethyl-1methylpropyl) phenol as an MOM ether by treating it with MOMCl and NaH in THF at rt (>99%), (iv) treatment of the resulting MOM ether with sec-BuLi in THF at -78°C followed by N,N-dimethylformamide at -78°C ∼ rt (96%), and (v) hydrolysis of the MOM-protected hydroxybenzaldehyde with 2-propanol saturated with HCl at rt (>99%)
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42
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11844265209
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note
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Although we had reported that the relative reaction ratio between 7 and 8 is >12 (Ref. 9a), the present study revealed that it is 15
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43
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11844286629
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note
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6 but its oxidation was also carried out in chloroform-d
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44
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11844291681
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note
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Irradiation was continued during the reaction. The role of photo-irradiation is twofold: (i) dissociation of the apicalnitrosyl ligand and (ii) acceleration of single electron transfer from Ru(III) species to molecular oxygen. The detailed mechanism of the reaction will be discussed elsewhere
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45
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11844268411
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note
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Reaction could be carried out in 5 mmol scale in a round-bottomed flask (100 mL) with three halogen lamps (150 W). The reaction in larger scale needs a more potent light source, because the reaction mixture is colored brownish red due to the presence of Ru complexes
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