In cases where AutoTS was unable to find a TS for a given reaction, we searched using the single-ended growing string method (SE-GSM), as implemented in the pyGSM code. SE-GSM calculations were conducted with a Q-Chem backend (version 5.3.2) at the ωB97X-D/def2-SVPD/PCM level of theory. To be as consistent as possible, TS found using SE-GSM in Q-Chem were reoptimized in Jaguar at the ωB97X-D/def2-SVPD(-f)/PCM level of theory.