Journal
ORGANOMETALLICS
Volume 37, Issue 23, Pages 4481-4487Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.8b00172
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Funding
- Helmholtz Research School Energy-Related Catalysis [VH-KO-403]
- Fonds der Chemischen Industrie [190481]
- Karlsruhe House of Young Scientists (KHYS) [SFB 1176]
- German Research Council (DFG)
- Queensland University of Technology (QUT)
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The enantiopure mono(borohydride) rare-earth complexes [Ln{(S)-PETA)}(2)(BH4)] (Ln = Sc (1), Lu (2); PETA = N,N'-bis((S)-1-phenylethyl)-tert-butylamidinate) are reported. The synthesis was achieved by salt metathesis reactions of the homoleoptic tris(borohydrides) [Ln(BH4)(3)(thf)(n)] and (S)-LiPETA. Complexes 1 and 2 were fully characterized, including single-crystal X-ray diffraction. Compounds 1 and 2 were evaluated as initiators for the ring-opening polymerization (ROP) of racemic lactide. Both 1 and 2 were found to be active in the ROP of DL-lactide. Polymerizations carried out in toluene show a higher activity for 2 but a lower selectivity in comparison to the scandium derivative.
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