US Patent 7,524,966
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
Ditopic molecules in the form of linear reaction templates have been used to construct ladder-like hydrocarbons known as [n]-ladderanes (n=3,5). The templates assemble and position reactant molecules in the solid state by way of hydrogen bonds for [2+2] photodimerization. The products, which are based on recently identified naturally occurring frameworks, form stereospecifically, in gram quantities, and in quantitative yield. The control of reactivity achieved using linear templates provides a basis for the development of molecular tools, termed assemblers, that could be used to manufacture, with atomic-level precision, a wide range of products (e.g. molecular nanostructures) with unique properties.
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Macgillivray, Leonard R Method for preparing ladderanes. US Patent 7,524,966 filed October 08, 2003 and issued April 28, 2009. https://ir.uiowa.edu/patents/481