After lurking around here & Rhodium's site for a few years, slowly & patiently gathering knowledge (so much farther to go), equipment & chems swim is ready to try the methadone synthesis Rhodium worked so hard on. A few questions first; In the "Introduction" of the write up it states that 2,2-diphenyl-4-dimethylaminovaleronitrile, the high-melting "methadone nitrile" is the desired product while the low melting "isomethadone nitrile" 2,2-diphenyl-3-methyl-4-dimethylaminobutyronitrile is not desired. But the low melting 2,2-diphenyl-3-methyl-4-dimethylaminobutyronitrile headlines the first section on the preparation & isolation of the desired isomer and it is listed in each of the 3 methods outlined for preparing methadone. Swim wants to clear this up so to find out the formula of the desired nitrile to figure out the molecular weight. Swim is hoping to be able to either scale up the nitrile preparation reaction or scale down the methadone preparation. Swim is hoping to avoid doing 10 nitrile preparations in order to have enough of the desired isomer to move onto the methadone preparation. Swim has not been able to find the formula or molecular weights of either of the nitriles named. Swim has tried chemfinder, sigma-aldritch, infomine, an old Merck, TFSE and various internet search engines ie. google etc... If anyone can share with us the formula and the molecular weight for the desired nitrile and what the desired nitrile is or better yet where to find the formula & mol weight it would be greatly appreciated. I do not have ready access to a college library to look up the references. After swim gets that info swim is planning to post the math for review before experimenting on changing the scale of reactants. After that swim will of course "share" the results, rather the information, on what happens or what doesn't happen. Thank you.