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The limits of stability of boraethenes—not containing bulky substituents—appear to have been reached with 2. Compounds 2 are formed by the thermal cycloreversion of Diels–Alder adducts and can be isolated in an argon matrix or trapped with, e.g., benzophenone (XOCH3, N(CH3)2).
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Maier et al. (1985) studied this question.
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