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(A) Second-order rate constants of tetrazines 2a,c–n with VBA 1 and norbornene 8 measured in 1:1 MeOH/PBS (pH = 7.4) at 20 °C, shown on a logarithmic scale. (B) Product formation of the reaction of tetrazine 2l with VBA 1 and subsequent oxidation with chloranil, yielding pyridazine 9 as a single isomer. [a] Previously reported.18 [b] Previously reported.21 [c] Endo/exo = 2:1.
