Stereocontrol in complexes of cyclam-like macrocycles - influences of chirality

Enforcement of chirality upon a macrocyclic tetramine ligand structure by the introduction of an asymmetric pendent arm which does not significantly modify the macrocycle conformation has no significant effect upon the geometry of the coordination sphere of a bound metal. Where substitution engendering chirality does cause a change in the ligand conformation, in particular for a ligand of restricted stereochemistry, these effects can be much greater. Thus, conversion of 3,7-diazacycloheptane to a macrocycle via attachment of chiral sidearms and ring closure through a template reaction leads to cyclam derivatives with unusual coordination properties. (C) 2004 Elsevier Ltd. All rights reserved.

Editorial

The article presents an introduction to the vol. 11 of the "Journal of Hospitality and Tourism Management." The author feels the need for a platform to publish articles and contemporary research in the areas of hospitality, travel, tourism, leisure and event management. The article presents brief information about some of the articles published in the issue. The first article is by Tim Lockyer entitled "Weekend Accommodation-The Challenge: What are the Guests Looking for?," it reports on the means of improving weekend occupancy in hotels. The second article is by Tim Lockyer and M. Tsai titled "Dimensions of Chinese Culture Values in Relation to the Hotel Dining Experience." In this article the authors examine their dining experience in a 5-star hotel in Taiwan. Another article is "Predicting Job Retention of Hourly Employees in the Lodging Industry," by Ady Milman and Peter Ricci. This article focuses on the data of hourly paid employees working in small or medium sized hotels in the United States.