those pressures are just too high for my comfort zone. The Li in ammonia is well documented on your site rhod, for the reduction of ephedrine. Mr. Clean's writeup it pretty good, and all precautions are noted. Chemically however do you think that the reduction will work on the dimethoxydihydrofuran C=C double bond? I am quite sure it will...no pressure and flammable gas, looks like a safer approach to me!