Journal
CHEMICAL COMMUNICATIONS
Volume 49, Issue 96, Pages 11246-11250Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cc43872d
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- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1152491] Funding Source: National Science Foundation
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Truly important scientific breakthroughs often come from catching the glimpses of order in chaos and distilling a large body of disjointed data into a clear set of simple concepts. Even more impressive is when the new conceptual framework is created with some of the keystones still missing. Such bold predictions, i.e. Mendeleev's eka-silicon, challenge and inspire, serving as powerful catalysts for scientific growth. The rules for ring closure formulated by Sir Jack Baldwin in 1976 constitute one of such bold intellectual advances. Baldwin developed a classification system that brought order to the chaos of possible cyclization patterns and suggested a set of rules to define the favourable modes of ring closure. Where sufficient data was lacking, particularly for the cyclizations of alkynes, Baldwin made testable predictions that challenged theoretical and experimental chemists. These guidelines have become the common starting point in the design of new cyclization reactions and catalyzed the development of modern stereoelectronic concepts.
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