Synthesis, characterization and ethylene reactivity of 2-diphenylphosphanylbenzamido nickel complexes
作者:Heon Yong Kwon、Su Yeon Lee、Bun Yeoul Lee、Dong Mok Shin、Young Keun Chung
DOI:10.1039/b317033k
日期:——
Addition of primary amines to N-[2-(diphenylphosphanyl)benzoyloxy]succinimide affords 2-diphenylphosphanylbenzamides, Ph2PC6H4C(O)NHR (R = C(CH3)3, 3; R = H, 4; R = CH2CH2CH3, 5; R = CH(CH3)2, 6). Addition of NiCl(η3-CH2C6H5)(PMe3) to the deprotonated potassium salts of the amides and subsequent treatment of two equivalents of B(C6F5)3 to the resulting products furnishes η3-benzyl zwitterionic nickel(II) complexes, [Ph2PC6H4C(O)NR-κ2N,P]Ni(η3-CH2C6H5) (R = C6H5, 9; R = C(CH3)3, 10; R = H, 11; R = CH2CH2CH3, 12; R = CH(CH3)2, 13). Solid structures of 9, 11, 13 and the intermediate η1-benzyl nickel(II) complexes, [Ph2PC6H4C(O)NR-κ2N,P]Ni(η1-CH2C6H5)(PMe3) (R = C6H5, 7; R = C(CH3)3, 8) were determined by X-ray crystallography. When ethylene is added to the η3-benzyl zwitterionic nickel(II) complexes, butene is obtained by the complexes 9–12 but complex 13 provides very high molecular-weight branched polyethylene (Mw, ∼1300000) with excellent activity (up to 5200 kg mol−1 h−1 at 100 psi gauge).
在 N-[2-(二苯基膦酰基)苯甲酰氧基]琥珀酰亚胺中加入伯胺,可得到 2-二苯基膦酰基苯甲酰胺 Ph2PC6H4C(O)NHR(R = C(CH3)3,3;R = H,4;R = CH2CH2CH3,5;R = CH(CH3)2,6)。将 NiCl(η3-CH2C6H5)(PMe3)加入到酰胺的去质子化钾盐中,然后将两个当量的 B(C6F5)3 加入到生成物中,就得到了 η3-苄基齐聚物镍(II)络合物 [Ph2PC6H4C(O)NR-κ2N,P]Ni(η3-CH2C6H5)(R = C6H5, 9;R=C(CH3)3,10;R=H,11;R=CH2CH2CH3,12;R=CH(CH3)2,13)。通过 X 射线晶体学确定了 9、11、13 和中间体 η1-苄基镍(II)配合物 [Ph2PC6H4C(O)NR-κ2N,P]Ni(η1-CH2C6H5)(PMe3) (R = C6H5,7;R = C(CH3)3,8)的固体结构。当乙烯加入到 η3-苄基齐聚物镍(II)络合物中时,络合物 9-12 可以得到丁烯,而络合物 13 则可以提供极高分子量的支链聚乙烯(Mw, ∼ 1300000),并具有极佳的活性(在 100 磅/平方英寸压力表下可达到 5200 公斤/摩尔-1 小时-1)。