Fig. 3: Control experiments and proposed mechanism.
From: Synthesis of metalla-dual-azulenes with fluoride ion recognition properties
a Isolation of intermediate 3a and its further conversion to 2a by stepwise addition of HBF4·Et2O and AgBF4 in the reaction. b Structure of the cation of 3a (thermal ellipsoids drawn with 50% probability, the phenyl groups in PPh3 and isopropyl groups in −CH = N+(iPr)2 omitted for clarity) (left), selected bond lengths (Å) for 3a (middle), detection of H2 by GC (gas chromatography) in the conversation of intermediate 3a to 2a (right). c Proposed mechanism for the formation of 2a.
