Journal
TETRAHEDRON LETTERS
Volume 47, Issue 7, Pages 1157-1161Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2005.12.034
Keywords
calixarene; titanium complex; alkyne cyclotrimerization
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Mono- and dinuclear titanium complexes of p-tert-butylthiacalix[4]arene were applied as a catalyst for [2+2+2] cycloaddition of terminal alkynes. They showed high catalytic activity and regioselectivity toward 1,3,5-trisubstituted benzenes over 1,2,4-trisubstituted isomers. The regioselectivity was rationalized in terms of the steric effect of the thiacalixarene skeleton and the coordination of the bridging Sulfur atom to the titanium center. (c) 2005 Elsevier Ltd. All rights reserved.
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