what is meant for under reduce pressure in synthesis of organic compound ?

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Paolo Suating

This means "under vacuum". "Removed solvent under reduced pressure" means to remove the solvent by rotary evaporation. "Solids dried under reduced pressure" likely means the solids were subjected to a vacuum such as in a vacuum desiccator.

Abdullah A. A. Ali Al-Hashmi

that mean you used vaccum to reduced pressure that lead to decrease boiling point of solvent that lead to rapid evapoation and low effect of temperature to substance