Add time:08/16/2019         Source:sciencedirect.com

Pyrrole and keto-amine based morpholine ligands are conveniently synthesized and their corresponding Al-compounds are afforded accordingly. The combination of 1, {C4H3NH-2-[CHNCH2CH2N(CH2CH2)2O]} and two equivalents of PhNCO generates compound 3, {C4H3N(CONPh)CHN(CONPh)(CH2)2NC4H4O} in relatively high yield. In addition, reacting 1 with one and two equivalents of AlMe3 in toluene render mono- and di-aluminum compounds, AlMe2{C4H3N[2-CHNCH2CH2N(CH2CH2)2O]} (4) and AlMe2{C4H3N[2-CHNCH2CH2N(CH2CH2)2O]AlMe3} (5), respectively. Similarly, reactions of morpholine bounded keto-amine ligands OCMeCHCMeNHCH2CH2N(CH2CH2)2O (2a) and OCPhCHCMeNHCH2CH2N(CH2CH2)2O (2b) with one and two equivalents of AlMe3 result the formation of mono- and di-aluminum compounds, AlMe2{OCRCHCMeN[CH2CH2N(CH2CH2)2O] (6a, R = Me; 6b, R = Ph) and AlMe2{OCRCHCMeN[CH2CH2N(CH2CH2)2O]·AlMe3 (7a, R = Me; 7b, R = Ph), respectively in moderate yield. Compounds 1, 3, 4 and 6b are subjected to X-ray diffraction analysis to ensure the geometry around Al atom. All the aluminum compounds could effectively commence the ring-opening polymerization (ROP) of ε-caprolactone in a well-controlled manner with molecular weight distributions (PDI = 1.08–1.37).

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