[La(N(Si(CH3)3)2)3] is a type of lanthanide (Ln) catalysts [Ln[N(SiMe3)2]3] that are used as a catalyst in the coordination−insertion ring-opening copolymerization mechanism.
Dear Islam Ismael this is a very interesting technical question. The catalyst La[N(SiMe3)2]3 is very air- and moisture-sensitive. Thus it must be always handled under nitrogen or argon atmosphere. When it becomes insoluble in toluene, this might be a sign that the catalyst is at least partially hydrolyzed. It can be "reactivated" by sublimation under high vacuum (marked in yellow in the attached link). You need a very good vacuum to successfully do this sublimation. If it worked, the sublimed material should be stored in a dry box. Alternatively you can of course buy a fresh sample and use it right away.
Good luck and best wishes, Frank Edelmann
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