The chiral phosphanylamido ligand, N(CHMePh)(PPh2)}−, has been introduced into co-ordination chemistry. As starting material the oily amines HN(R-*CHMePh)(PPh2)
(1a) and HN(S-*CHMePh)(PPh2)
(1b) were used. To reconfirm their absolute structure, 1b was oxidized with H2O2 in air to obtain HN(S-*CHMePh)(P(O)Ph2)
(2) as a solid compound. The solid-state structure of 2 was established by single-crystal X-ray diffraction. The lithium salts of both enantiomers LiN(R-*CHMePh)(PPh2)}
(3a) and LiN(S-*CHMePh)(PPh2)}
(3b) were prepared by deprotonation reaction of 1a,b. Compounds 3a,b were further reacted with zirconocen dichloride to give the chiral metallocenes [(η5-C5H5)2Zr(Cl)η2-N(R-*CHMePh)(PPh2)}]
(4a) and [(η5-C5H5)2Zr(Cl)η2-N(S-*CHMePh)(PPh2)}]
(4b). In an alternative approach to give chiral zirconium compounds, the neutral amine 1b was reacted with [(PhCH2)4Zr] to give the enantiomeric pure complex [(PhCH2)3Zrη2-N(S-*CHMePh)(PPh2)}]
(5). The solid-state structures of all zirconium complexes were determined by single-crystal X-ray diffraction.
手性
磷酰
氨基
配体 N(CHMePh)(PPh2)}− 已被引入配位
化学中。作为起始原料,
油胺 HN(R-*CHMePh)(PPh2)
(1a) 和 HN(S-*CHMePh)(PPh2)
使用(1b)。为了再次确认它们的绝对结构,在空气中用
H2O2氧化1b得到HN(S-*CHMePh)(P(O)Ph2)
(2)作为固体化合物。通过单晶X射线衍射建立了2的固态结构。两种对映体LiN(R-*CHMePh)(PPh2)}的
锂盐
(3a) 和 LiN(S-*CHMePh)(PPh2)}
(3b)是通过1a、b的去质子化反应制备的。化合物3a,b进一步与二
氯化
锆反应得到手性茂
金属[(η5-
C5H5)2Zr(Cl)η2-N(R-*CHMePh)(PPh2)}]
(4a) 和 [(η5- )2Zr(Cl)η2-N(S-*CHMePh)(PPh2)}]
(4b)。在获得手性
锆化合物的另一种方法中,中性胺 1b 与 [(PhCH2)4Zr] 反应,得到对映体纯络合物 [(PhCH2)3Zrη2-N(S-*CHMePh)(PPh2)}]
(5)。所有
锆配合物的固态结构均通过单晶 X 射线衍射测定。