Tetrahedron Letters provides maximum dissemination of outstanding developments in organic chemistry. The journal is published weekly and covers developments in techniques, structures, methods and conclusions in experimental and theoretical organic chemistry. Rapid publication of timely and significant research results enables researchers from all over the world to transmit quickly their new contributions to large, international audiences. From January 1997, the full papers for Tetrahedron Letters will be available online over the Internet. Using the World Wide Web to increase the speed of delivery will allow the scientist access to the full text of this leading journal up to four weeks before the issue arrives in the library, laboratory or office. For further details visit the Tetrahedron Letters Online Homepage From 1996, Tetrahedron Letters is included in Tetrahedron Alert, the first phase of the Tetrahedron Information System. Tetrahedron Alert is the new electronic information service accessible via the Internet, and is a pre-publication service which provides the contents lists and graphical abstracts of current and forthcoming issues for all 5 of the Tetrahedron journals. Updated weekly Tetrahedron Alert offers: the option to view the contents list as graphical abstracts; the ability to search a single journal or across all 5 journals; search options using user-friendly query forms; hypertext links to facilitate navigation; the facility to print to your own printer. At any given time, Tetrahedron Alert contains approximately 3-4 months worth of current issues and accepted papers. A sampler which demonstrates the content and functionality of Tetrahedron Alert can be accessed via the Tetrahedron Information System Home Page.