ok thanks for answering...
I would like to know, if you don't think that best results are got by using 10-20% sulfuric acid as anolyte and as catholyte I would prefere to use a solution of hydrochloric acid of less than about 10%. then I would put the nitro...compound to be reduced to into the cathode compartment of my reaction cell. Then I would an courent of about 0.1 to 0.2 ampere per square centimeter let pass through the cell. And while courent passes the temperature of cell is maintained between 50°-100°C....ok thats the non-specific theory
and if you wanna hydrate ephedrine to (+) N-Methyl-beta-phenyl-isopropylamin, then I would use for example 4g of ephedrine HCl disolved in 90ccm actetic acid. To this solution 4,7g of sulfuric acid of 84% and also 1g Palladium are added and hydrated at a temperature of 60°C and 3,5 atü. After 1 mol of H is exhausted the reaction ends. while filtering the catalyste the sulfuric acid is neutralized with dry soda, the actetic acid is distilled of in vaccum and the residuent is after the adding of conzentrated NaOH as long treated with steam untill no amine distilles. the distillate which is neutralized with HCl is evaporeted in vaccum as a result you will get (+)-methyl-beta-phenylisopropylamin in a quantity of 95%. Its meltingpoint is about 166°-168°C after crystallization it melts at 172°C.