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A series of lanthanide complexes including (Ind) 3Sm(THF) (1), [(MeCp) 2Sm(μ SPh)(THF)] 2 (2), [(MeCp) 2Y(μ O i Pr)] 2 (3), (MeCp) 3Sm·THF (4), Sm(SPh) 3(hmpa) 3 (5), [(MeCp) 2Y (μ OCH 2CF 3)] 2 (6) and (CF 3CH 2O) 3Y(THF) 3 (7) were synthesized and they have good activity for the oligomerization of phenyl isocyanate. Among them 5 shows the highest activity. The conversion is as high as 96.2%, with 1/2500 of the molar ratio of cat./PhNCO. The main components in oligomer were characterized to be a cyclodimer and a cyclotrimer. The ratio of cyclodimer to cyclotrimer depends on the lanthanide complexes used. 7 gave 85.2% cyclotrimer with 1/300 of the molar ratio of cat./PhNCO at 40 ℃ for 0 5 h, while 5 gave 77 6% cyclodimer with 1/300 of the molar ratio of cat./PhNCO at 40 ℃ for 4 h.
A series of lanthanide complexes including (Ind) 3Sm (THF) (1), [(MeCp) 2Sm (μ SPh) (THF)] 2 (2), [(MeCp) 2Y (MeCp) 3Sm · THF (4), Sm (SPh) 3 (hmpa) 3 (5), [(MeCp) 2Y (μOCH 2 CF 3)] 2 ) 3 (7) were synthesized and they have good activity for the oligomerization of phenyl isocyanate. Among them 5 shows the highest activity. The conversion is as high as 96.2% with 1/2500 of the molar ratio of cat./PhNCO. The main components in oligomer were characterized to be a cyclodimer and a cyclotrimer. The ratio of cyclodimer to cyclotrimer depends on the lanthanide complexes used. 7 gave 85.2% cyclotrimer with 1/300 of the molar ratio of cat./PhNCO at 40 ° C for 0 5 h, while 5 gave 77 6% cyclodimer with 1/300 of the molar ratio of cat./PhNCO at 40 ° C for 4 h.