Affordable Access

Publisher Website

The co-cyclotrimerization of hexynes and phenylacetylene with niobium(V) chloride as catalyst

Authors
Journal
Journal of Molecular Catalysis
0304-5102
Publisher
Elsevier
Publication Date
Volume
64
Issue
3
Identifiers
DOI: 10.1016/0304-5102(91)85136-p
Keywords
  • Chemical And Metal Complex Catalysis

Abstract

Abstract Various alkynes were cyclotrimerized with NbCl 5 as catalyst and C 2H 5AlCl 2 as co-catalyst at an Al/Nb molar ratio = 2 in CCl 4 at room temperature and pressure. The tendency of the alkynes to cyclotrimerize decreased in the following order: phenylacetylene > hex-1-yne > hex-2-yne ~ hex-3-yne ~ oct-4-yne If phenylacetylene (X) was co-cyclotrimerized with another alkyne (Y), four different cyclotrimers were found, as represented by the following equation: X + Y → X 3 + X 2Y + XY 2 + Y 3 If the amount of cyclotrimers formed is plotted against the phenylacetylene mole fraction, a statistically random distribution of the products is observed. Differences with regard to the ideal random case are attributed to a polymerization reaction. During the cyclo-trimerization process there is therefore a statistically random coordination of the alkynes on the catalytic species, after which ring closure occurs to form the cyclotrimeric products.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Photo-enhanced catalysis of the cyclotrimerization...

on Journal of Molecular Catalysis Jan 01, 1990

The cyclotrimerization and cocyclotrimerization of...

on Journal of Molecular Catalysis Jan 01, 1989

The role of niobium(V) chloride in the catalytic c...

on Journal of Molecular Catalysis Jan 01, 1987

Regioselective cyclotrimerization of phenylacetyle...

on Journal of Organometallic Chem... Jan 01, 2004
More articles like this..