Research Letters in Organic Chemistry
Volume 2009 (2009), Article ID 240253, 5 pages
doi:10.1155/2009/240253
Research Letter

Accelerations in the Lactonization of Trimethyl Lock Systems Are due to Proximity Orientation and not to Strain Effects

Rafik Karaman

Faculty of Pharmacy, Al-Quds University, P. O. Box 20002, Jerusalem, Palestinian

Received 18 November 2008; Accepted 20 January 2009

Academic Editor: Robert Flowers

Copyright © 2009 Rafik Karaman. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

Supporting Information Available: Table S1, AM1 calculated selected bond angles and distances of hydroxyhydrocinnamic acid derivatives. Table S2, AM1, HF and DFT calculated energies and geometrical parameters for processes 1a-1d. Table S3, AM1 calculated change in energy upon the change in the dihedral angle C1 C2C3C4 in hydroxyhydrocinnamic acids 1a and 1c. Figure S1, AM1 optimized structures for 1a-1d, 2a-2d, 3a-3d and 4a-4d.

  1. Supplementary Material