Issue Date: September 28, 2009
Tin Alkyne Analog's On-Off Cycloaddition
A tin analog of acetylene, a rare compound with a Sn≡Sn bond, is proving to have unusual reactivity: It reversibly adds two ethylene molecules across the triple bond under ambient conditions, a reaction normally forbidden to its carbon analog, report Yang Peng, Philip P. Power, and coworkers of the University of California, Davis (Science 2009, 325, 1668). Cycloaddition reactions involving alkenes or alkynes are classic transformations in organic synthesis, leading to stable products. . . .
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