Shu‐Ping Huang

Synthesis and crystal structures of novel β-diketiminato-lithium, iron, cobalt, nickel, zirconium complexes and their catalytical behaviors in polymerization of ethylene

Treatment of azaallyl-lithium [ LiN(R)C(Bu t )C HR] with equal portion of 1-piperidinecarbonitrile gave mix-substituted bdiketiminato-lithium 2. Double ratio of 2 with FeCl2, CoCl2 and NiCl2/6H2O yielded the b-diketiminate iron 3, cobalt 4, nickel 5 ,o r equivalent of ZrCl4 led to zirconium complex 6, respectively. The structural features of these complexes were described, and the catalytical behaviors of the complexes 3 � /6 for the polymerization of ethylene were investigated. # 2002 Elsevier Science B.V. All rights reserved.

2‐(2‐Ammonio­phenyl­amino)ethanaminium hexa­chloro­stannate(IV) monohydrate

The title compound, (C8H15N3)[SnCl6]·H2O, is a salt involving a doubly protonated amine cation and a divalent [SnCl6]2− anion. The solid-state structure agrees with that found by 1H NMR and 13C NMR analyses. The salt has potential for use in the synthesis of organometallic compounds.

2-Chloro-1,1-di­methyl-2-phenyl-2,3-di­hydro-1H-1,2-benzazoniaborolate

In the crystal structure of the title compound, C15H17BClN, the coordination around both B and N is distorted tetrahedral. The five-membered heterocycle adopts a folded conformation.

4‐tert‐Butyl‐2‐(4‐pyridyl)‐N,N′‐bis­(tri­methyl­silyl)­propane‐1,3‐di­imine

In the title compound, C18H33N3Si2, the central diketiminate system is essentially planar. A short intramolecular hydrogen bond involving the imine N atoms forms a pseudo-six-membered ring.

[2-(Di­methyl­amino)­benzyl][(N–B)-2-(di­methyl­ammonio)­benzyl]­phenyl­borate

In the crystal structure of the title compound, C24H29BN2, the coordination around both the B and N atoms is distorted tetrahedral. The five-membered ring adopts an envelope conformation, with the flap atom, B, displaced by 0.629 (6) A from the plane of the other four atoms.

[Benzylbis(dimethylamino)methylsilyl-κ2C,N](N,N,N′,N′-tetramethylethylenediamine-κ2N,N)lithium(I)

The title compound, [Li(C12H21NSi)(C6H16N2)], is an intermediate in the synthesis of the corresponding organometallic compounds. The molecule has an unusual C-Si-N-Li four-membered heterocycle which adopts a folded conformation, with the coordination around the Li, N, C and Si atoms being distorted tetrahedral. Its structure is strongly supported by 1H NMR, 13C NMR and 13C-1H correlation spectra. The compound has potential for application in the synthesis of other novel organometallic compounds.

2‐tert‐Butyl‐4‐piperidino‐β‐diket­imine

The title compound, C12H23N3, was prepared and its crystal structure was determined. The five-membered N—C=C—C=N fragment is planar.

(E)-2-Methyl-3-(phenethylamino)-1-phenylprop-2-en-1-one

The title compound, a secondary enamine PhCOC(CH3)CHNH(CH2)2Ph or C18H19NO, is U-shaped. The dihedral angle between the two phenyl rings is 109.7 (4)°. N—H⋯O hydrogen bonds link the molecules to form a chain.

1,2‐Di­methyl‐3‐(2‐nitro­phenyl)‐4,5‐di­hydro­imidazolium iodide

In the crystal structure of the title compound, C11H14N3O2+·I−, intermolecular C—H⋯O and C—H⋯I hydrogen bonds link the ions into a three-dimensional structure. The imidazolinium ring is planar within 0.0502 (2) A. The dihedral angle of the imidazolinium plane and the benzene ring plane is 78.45 (7)°.

(1R,2R)-(–)-Bis­[μ4-1-{[1,1-di­methyl-2-(tri­methyl­silyl)­amidino]­amino}-2-({1,1-di­methyl-2-[1,1-di­methyl-2-(tri­methyl­silyl)­amidino]­amidino}amino)cyclo­hexane]­tetralithium(I)

: The title compound, [Li(4)(C(21)H(46)N(8)Si(2))(2)], has been prepared and its structure determined. The whole molecule can be regarded as a molecular cage made up of the central eight-membered ring and six contiguous rings of three types. As the first example of a bridged amidinate-dicyanamide framework, this noteworthy structure and its electronic features are presented.