Controlling Individual Unfavorable Reactions

  • Author: ChemistryViews
  • Published: 13 March 2011
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Science/AAAS
thumbnail image: Controlling Individual Unfavorable Reactions

Paul Weiss and colleagues, University of California, Los Angeles, CA, USA, have demonstrated a method for isolating two molecules on a substrate and controlling how they react when excited with ultraviolet light. This technique could allow access to conjugated organic molecules allowed by selection rules but unobserved in solution due to unfavorable reaction geometries.


The technique involved a defect in a self-assembled monolayer (SAM) on a gold surface. This defect was designed so that two sulfur-modified organic molecules would attach in the correct alignment prior to reaction. UV light was used to initiate the photochemical transformation which could be monitored by scanning tunneling microscopy. A [4+2] Diels-Alder addition reaction between the ethynyl moiety and the central ring of a second 9-phenylethynylanthracene could be triggered in this way, rather than the more common [4+4] addition.


Article Views: 2258

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH