(Hydrotris(3,5-dimethylpyrazolyl)borato)niobium Alkyne Complexes:  Dichloro and Dialkyl Derivatives and Formation of a Butadienyl Complex with an α-Agostic Interaction

1996 ◽  
Vol 15 (4) ◽  
pp. 1106-1112 ◽  
Author(s):  
Michel Etienne ◽  
Fabienne Biasotto ◽  
René Mathieu ◽  
Joseph L. Templeton
Keyword(s):  
Agostic Interaction ◽  
Alkyne Complexes

Optical resolution and reactivity of chiral tungsten alkyne complexes

1992 ◽  
Vol 114 (26) ◽  
pp. 10097-10103 ◽  
Author(s):  
J. L. Caldarelli ◽  
P. S. White ◽  
J. L. Templeton
Keyword(s):  
Optical Resolution ◽  
Alkyne Complexes

Bis(1-phenyl-1-propyne) complexes of tungsten(II): crystal structures of [WI2(CO)(NCR)(η2-MeC2Ph)2] (R = Me, Et, or Ph)

2001 ◽  
Vol 79 (3) ◽  
pp. 263-271
Author(s):  
Paul K Baker ◽  
Michael GB Drew ◽  
Deborah S Evans
Keyword(s):  
Carbon Monoxide ◽  
Solid State ◽  
Crystal Structures ◽  
Octahedral Geometry ◽  
X Ray ◽  
X Ray Crystallography ◽  
Alkyne Complexes ◽  
First Time

Reaction of [WI2(CO)3(NCMe)2] with two equivalents of 1-phenyl-1-propyne (MeC2Ph) in CH2Cl2, and in the absence of light, gave the bis(1-phenyl-1-propyne) complex [WI2(CO)(NCMe)(η2-MeC2Ph)2] (1) in 77% yield. Treatment of equimolar quantities of 1 and NCR (R = Et, i-Pr, t-Bu, Ph) in CH2Cl2 afforded the nitrile-exchanged products, [WI2(CO)(NCR)(η2-MeC2Ph)2] (2-5) (R = Et (2), i-Pr (3), t-Bu (4), Ph (5)). Complexes 1, 2, and 5 were structurally characterized by X-ray crystallography. All three structures have the same pseudo-octahedral geometry, with the equatorial sites being occupied by cis and parallel alkyne groups, which are trans to the cis-iodo groups. The trans carbon monoxide and acetonitrile ligands occupy the axial sites. In structures 1 and 2, the methyl and phenyl substituents of the 1-phenyl-1-propyne ligands are cis to each other, whereas for the bulkier NCPh complex (5), the methyl and phenyl groups are trans to one another. This is the first time that this arrangement has been observed in the solid state in bis(alkyne) complexes of this type.Key words: bis(1-phenyl-1-propyne), carbonyl, nitrile, diiodo, tungsten(II), crystal structures.

The reactions of linear conjugated diynes with Dicarbonyl(η-cyclopentadienyl)- cobalt and -rhodium

1975 ◽  
Vol 28 (2) ◽  
pp. 285 ◽  
Author(s):  
RS Dickson ◽  
LJ Michel
Keyword(s):  
Thermal Degradation ◽  
Aromatic Compound ◽  
Substituted Benzenes ◽  
Polycyclic Aromatic Compound ◽  
Organic Products ◽  
Polycyclic Aromatic ◽  
Alkyne Complexes ◽  
Conjugated Diynes

The reactions of (η-C5H5)Co(CO)2 with the diynes hexa-2,4-diyne and 1,4- diphenylbutadiyne give three isomers of the cyclopentadienone complexes (C5H5)Co[(RC2C2R)2CO], R = Me or Ph, and two isomers of the tris-alkyne complexes (C5H5)2Co2(RC2C2R)3CO, R = Me or Ph. Organic products of formula (RC2C2R)3, R = Me or Ph, (MeC2C2Me)5, and (PhC2C2Ph)3CO have been isolated also. Two isomers of (RC2C2R), were separated and were identified as the 1,2,4-(R)3-3,5,6-(C2R)3- and the 1,3,5-(R)3-2,4,6-(C2R)3-benzenes. The compound (PhC2C2Ph)3CO is believed to be tris(phenylethynly)triphenylcycloheptatrienone, and (MeC2C2Me)5 is probably a polycyclic aromatic compound. Thermal degradation of the complexes (C5H5)2CO2(RC2C2R)3CO gives the substituted benzenes (RC2C2R)3. ��� The reaction of (η-C5H5)Rh(CO)2 and hexa-2,4-diyne gives the cyclopentadienone complex(C5H5)Rh[(MeC2C2Me)2CO] and the cycloheptatrienone complex (C5H5)Rh[(MeC2C2Me)3CO].Two isomers of the substituted benzene (MeC2C2Me)3 were obtained also.

Formation of Propargylic Stereocentres using Desymmetrised Alkyne Complexes

Synlett ◽  
2001 ◽  
Vol 2001 (11) ◽  
pp. 1711-1714 ◽  
Author(s):  
Anthony J. Fletcher ◽  
Ross Fryatt ◽  
David T. Rutherford ◽  
Mark R. J. Elsegood ◽  
Steven D. R. Christie
Keyword(s):  
Alkyne Complexes
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