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Bermuda triangle: The first molecule containing a cyclic three-membered SnCP ring has been synthesized and characterized. This SnIIP Lewis pair reacts at room temperature with alkynes and pentene to give the five-membered cyclic addition products. In the case of pentene, this reaction is reversible at room temperature. Trip=2,4,6-iPr3C6H2.
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Freitag et al. (2013) studied this question.
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