Pentacoordinate silicon compounds: Stereochemical non-rigidity of chelates formed by intramolecular ring-closure. Crystal structure of 8-dimethylamino-1-trifluorosilylnaphthalene

1994 ◽  
Vol 470 (1-2) ◽  
pp. 43-57 ◽  
Author(s):  
Francis Carré ◽  
Robert J.P. Corriu ◽  
Agapit Kpoton ◽  
Monique Poirier ◽  
Gérard Royo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ring Closure ◽  
Silicon Compounds ◽  
Pentacoordinate Silicon ◽  
Intramolecular Ring

Coordinative Interactions in Chelated Complexes of Silicon, Part III Crystal and Molecular Structure of 1-Trichlorosilyl-1,2,3,4-tetrahydro-1,10-phenanthroline

1983 ◽  
Vol 38 (7) ◽  
pp. 825-829 ◽  
Author(s):  
Gerhard Klebe ◽  
Jan W. Bats ◽  
Karl Hensen
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Chemical Reaction ◽  
Equatorial Plane ◽  
Crystal And Molecular Structure ◽  
Axial Position ◽  
Single Bond ◽  
Silicon Compounds ◽  
Trigonal Bipyramidal ◽  
Pentacoordinate Silicon

Abstract The crystal structure of C12H11N2SiCl3 (monoclinic, P21/m, Z = 2, with a: 9.284(4), b: 7.226(2), c: 10.832(5) Å, β = 115.14(3)°) was refined to R(F) =0.035 from 1228 independent reflections. A trigonal bipyramidal, pentacoordinate silicon is observed. The chelated complex shows two different Si−N bonds, a coordinative bond (1.984(2) Å) between Si and N on the axial position and a Si−N single bond (1.737(3) A, equatorial plane), introduced by chemical reaction. The coordinative bond is 14.2% longer than the Si−N single bond. The lengthening of the coordinative bond in the present case is compared with distances in other extracoordinated silicon compounds.

Ring closure of cyclooctatetraenetricarbonyliron complexes: Crystal structure of a bicyclo[4.2.0]-2,4,7-octatrienetricarbonyliron compound

1974 ◽  
Vol 78 (3) ◽  
pp. C43-C46 ◽  
Author(s):  
Michael Cooke ◽  
Judith A.K. Howard ◽  
Charles R. Russ ◽  
F.Gordon A. Stone ◽  
Peter Woodward
Keyword(s):  
Crystal Structure ◽  
Ring Closure

scholarly journals TfOH-Promoted Reaction of 2,4-Diaryl-1,1,1-Trifluorobut-3-yn-2-oles with Arenes: Synthesis of 1,3-Diaryl-1-CF3-Indenes and Versatility of the Reaction Mechanisms

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3079 ◽  
Author(s):  
Aleksey V. Zerov ◽  
Anna N. Kazakova ◽  
Irina A. Boyarskaya ◽  
Taras L. Panikorovskii ◽  
Vitalii V. Suslonov ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Reaction Mechanisms ◽  
Room Temperature ◽  
Ring Closure ◽  
Nucleophilic Attack ◽  
New Process ◽  
Intramolecular Ring ◽  
Propargyl Alcohols

The TfOH-mediated reactions of 2,4-diaryl-1,1,1-trifluorobut-3-yn-2-oles (CF3-substituted diaryl propargyl alcohols) with arenes in CH2Cl2 afford 1,3-diaryl-1-CF3-indenes in yields up to 84%. This new process for synthesis of such CF3-indenes is complete at room temperature within one hour. The synthetic potential, scope, and limitations of this reaction were illustrated by more than 70 examples. The proposed reaction mechanism invokes the formation of highly reactive CF3-propargyl cation intermediates that can be trapped at the two mesomeric positions by the intermolecular nucleophilic attack of an arene partner with a subsequent intramolecular ring closure.

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