[2 + 4] Cycloaddition reactions of dialkylaminobis(trifluoromethyl)boranes with 1,3-dienes, β-unsaturated carbonyl compounds and methyl methacrylate. Crystal structures of (CF3)2BNR2CH2C(Me)C(Me)CH2, R = Me and Et, and (CF3)2BNEt2CH2CHC(Me)O

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