hello,
I am trying to separate a star shaped siloxane polymer from starting material using column with some luck. Using 70/30 hexane/EA, I can get my product but with a few problems:
1- The desired product elutes last. However, it seems to be very sticky to the column, as it takes a long time to elute, and flash column shows multiple different peaks of the same material
2- NMR shows that the product may be decaying on the column. Would that be possible? and if so, how can it be avoided?