L-pac to l-ephedrine operating conditions

[monkey island]

let`s suposse we already have L-PAC, L-phenylacetylcarbinol or R-phenylacetylcarbinol is the same, then all talking about doing a reductive amination to form L-ephedrine but in my experience the operating conditions made the result DL-ephedrine or L-ephedrine.

and D isn`t good at all, the reductive amination of L-PAC with Al/HG is a chemical synthesis with methylamine.actually 40% aq. solution is present.

and with PtO2 is doing with a reactor, i want to discuss the chemical syntesis with AL/HG first.

someone with experience or some idea how to get only the L-isomer with a high yield.

someone can help here, and for the p2p begginers process from ethyl phenylacetate to D-meth. with success.

For example:

ratio of methylamine:LPAC

solution of reaction in what: ethanol, methanol,ether, Dh20.

make a oxime first with methylamine or all at once with al/hg.

what quantity of ratio by weight of catalyst AL/HG.

Temperature Hot or Cold

Let the exothermic reaction goes alone or cooling by periods.