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Pressure of a hydrogen balloon is 1 atm. We have also carried out three different reactions of 4-methylbenzaldehyde 1 (3 mmol) with 1 mol% of Pd-BNP in 5 mL water in a Shaker hydrogenator apparatus with 1 atm, 2 atm and 4 atm hydrogen pressure. The isolated yields of the product 2a for all these cases are 93%, 94% and 97% with different reaction times. The reaction with 1 atm hydrogen pressure was completed within 17 h, but 2 atm and 4 atm hydrogen pressure reactions took 12 h and 5 h for completion. In higher atmospheric hydrogen pressures, reduction of the reaction time was observed. Increasing the H, pressure increases the rate of reaction without affecting the yield of the product
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2 pressure increases the rate of reaction without affecting the yield of the product.
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of catalyst was carried out with different lipophilic solvents such a carbon tetrachloride, benzene, toluene and hexanes, only, yields of the product 2a were isolated after 24 h of reaction, These observations show that the rate of reaction is accelerated when water is used as solvent and reduction is more favorable in water than in the lipophilic solvents
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When the reduction reaction of 4-methylbenzaldehyde 1 with 1 mol% of catalyst was carried out with different lipophilic solvents such a carbon tetrachloride, benzene, toluene and hexanes, only 10–20% yields of the product 2a were isolated after 24 h of reaction. These observations show that the rate of reaction is accelerated when water is used as solvent and reduction is more favorable in water than in the lipophilic solvents.
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We have performed the reduction reaction of 0.5 mmol of 4-methylbenzaldehyde 1 with 1 mL and 0.5 mL of, yields of alcohol 2a were isolated, The yield of the product 2a was decreased by increasing the concentration of the reaction
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We have performed the reduction reaction of 0.5 mmol of 4-methylbenzaldehyde 1 with 1 mL and 0.5 mL of water, 83% and 55% yields of alcohol 2a were isolated. The yield of the product 2a was decreased by increasing the concentration of the reaction.
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