Qi-Guang Wang

A Fully Encapsulated Acetylenediide in Ag2C2⋅8 AgF

The reaction of Ag2 C2 with a concentrated aqueous solution of AgF leads to the title compound, in which the dianion C22- is completely enclosed in the Ag9 cage of a chandelierlike arrangement of ten silver atoms.

Synthesis of optically-active planar chiral derivatives of ferrocene. Crystal structures of alkyne insertion products

Abstract Asymmetric cyclopalladation of new chiral ferrocenylimine (S)-(−)-[{η5-C5H4CHNCH(CH3)(c-C6H11)}Fe(η5-C5H5)], (S)-(−)-3, gave di-μ-chloro-bridged cyclopalladated (Rp,S,S,Rp)-(+)-[ Pd ⌜ {( η 5 − C 5 H 3 CH  ⌝ N CH(CH3)(c-C6H11))Fe(η5-C5H5)}(μ-Cl)]2, (Rp,S,S,Rp)-(+)-4. Treatment of (Rp,S,S,Rp)-(+)-4 or (Sp,S,R,S,S,R,S,Sp)-(+)-[ Pd ⌜ {( η 5 − C 5 H 3 CH  N ⌝ CH 2 C ⌜ HCH 2 CH 2 C ⌞ HC ( CH 3 ) 2 C ⌝ H C ⌟ H2)Fe(η5-C5H5)}(μ-Cl)]2, (Sp,S,R,S,S,R,S,Sp)-(+)-6, with diphenylacetylene yielded the corresponding bis(alkyne) insertion products (Rp,S)-(+)-[{(η3-(C6H5CCC6H5)2) Pd ⌜ Cl ( η 5 − C 5 H 3 CH  N ⌝ CH(CH3)(c-C6H11)}Fe(H5-C5H5)], (Rp,S)-(+)-5, and (Sp,S,R,S)-(−)-[{(η3-(C6H5CCC6H5)2) Pd ⌜ Cl ( η 5 − C 5 H 3 CH  N ⌝ CH 2 C ⌜ HCH 2 CH 2 C ⌞ HC ( CH 3 ) 2 C ⌝ H C ⌟ H2)}Fe(η5-C5H5)], (Sp,S,R,S)-(−)-7, respectively. The absolute configurations of (Rp,S)-(+)-5 and (Sp,S,R,S)-(−)-7 have been determined by single-crystal X-ray analysis.

Ein vollständig umschlossenes Acetylendiid in Ag2C2⋅8 AgF

Aus Ag2C2und einer konzentrierten wasrigen AgF-Losung entsteht die Titelverbindung, in der das Dianion C22− vollstandig im Ag9-Kafig einer kronleuchterartigen Anordnung von zehn Silberatomen eingeschlossen ist (Strukturbild rechts).

An improved synthesis of (−)-syringolides and X-ray structural characterization of synthetic (−)-syringolide 1

Abstract On treatment with 10% HF, butenolides 4a and 4b afforded enantiopure (−)-syringolides 1 (1a) and 2 (1b) respectively in much higher yields. Unprecedentedly, the cyclic acetal 5a was also converted to 1a by reacting with an excess of p-TsOH. The structure of the synthetic (−)-syringolide 1 (1a) was substantiated by an X-ray crystallographic study.

Construction of two- and three-dimensional supramolecular networks with an encapsulated lanthanide(III) complex as building block and hydrogen-bonded 4,4′-bipyridyl as spacer

Reaction of the tripodal ligand tris(2-benzimidazolylmethyl)amine (ntb) with hydrated lanthanide(III) perchlorates in methanol affords the complexes [Ln(ntb)2]3+ (Ln = Pr, Eu and Tb) in which the central Ln3+ ion is well encapsulated in a cubic coordination environment; in situ co-crystallization of the complexes in the presence of 4,4′-bipyridyl produces either a double salt containing the bipyridinium(1+) cation or adducts with two to three bipyridyl molecules, the latter adducts forming doubly interpenetrating two- or three-dimensional cationic networks.

ISOLATION AND ABSOLUTE CONFIGURATIONS OF DIASTEREOMERS OF A DIMERIC CHLORO-BRIDGED PLANAR CHIRAL CYCLOPALLADATED DERIVATIVE OF FERROCENE

Abstract Two diastereomers of a dimeric chloro-bridged planar chiral cyclopalladated derivative of ferrocene were isolated in enantiomerically pure form and their absolute configurations have been determinated by single-crystal X-ray analysis.

Isolation and absolute configuration of diastereomeric di-μ-chloro-bridged dimers of a planarchiral cyclopalladated ferrocenylimine

Abstract Reaction of acetylferrocene (1) with (−)-( S )-1-amino-2-(methoxymethyl)pyrrolidine (−)-( S )-2 in dry benzene gave new chiral.

A novel (CF3SO3−)6 cluster with multiple F⋯F interactions: crystal structure of a self-assembled trinuclear Ag(I) complex with the tripodal ligand tris(2-benzimidazolylmethyl)amine

Self-assembly of silver(I) trifluoromethanesulfonate with the tripodal ligand tris(2-benzimidazolylmethyl)amine (ntb) affords the trinuclear complex [Ag3(ntb)2](CF3SO3)3, which exhibits a rhombohedral network formed from N–H⋯O hydrogen bonds and weak Ag⋯O interactions linking [Ag3(ntb)2]3+ cations with a novel S6-symmetric (CF3SO3−)6 cluster consolidated by multiple F⋯F interactions.

Reaction of [Cu2(μ-Ph2Ppypz)2(MeCN)2](ClO4)2 (Ph2Ppypz=(2-diphenylphosphino-6-pyrazol-1-yl)pyridine) with Fe(CO)42− and X− (X=Cl, I, MeCO2 and pyrazolate)

Abstract [Cu 2 ( μ -Ph 2 Ppypz) 2 (MeCN) 2 ](ClO 4 ) 2 (Ph 2 Ppypz=(2-diphenylphosphino-6-pyrazol-1-yl)pyridine) reacts with Fe(CO) 4 2− in tetrahydrofuran to give [Cu 2 ( μ -Ph 2 Ppypz) 2 (MeCN) 2 ](Fe(CO) 4 ), 1, and with X − in acetonitrile or tetrahydrofuran at room temperature to afford [Cu 2 ( μ -Ph 2 Ppypz) 2 ( μ -X)](ClO 4 ) (X=Cl, 2 ; I, 3 ; MeCO 2 , 4 ; pyrazolate, 5 ). The crystal structures of 1 , 3 ·Et 2 O, 4 ·Et 2 O and 5 have been determined by X-ray crystallography.

Synthesis and structure of a heterotrinuclear complex bridged by 2,6-bis (diphenylphosphino)pyridine,[Ir2Cu(CO)2Cl2 (MeCN) {μ-(Ph2P)2py}2](ClO4)

Abstract The complex Ir 2 (CO) 2 Cl 2 { μ -(Ph 2 P) 2 py} 2 , which was synthesized from [Ir(cod)Cl] 2 and (Ph 2 P) 2 py [(Ph 2 P) 2 py=2,6-bis(diphenylphosphino)pyridine)], reacted with[Cu(MeCN) 4 ](ClO 4 ) to form the heterotrinuclear complex [Ir 2 Cu(CO) 2 Cl 2 (MeCN){ μ -(Ph 2 P) 2 py} 2 ](ClO 4 ),whose structure has been determined by X-ray crystallography.