Recent advancements in enantio-/diastereodivergent
dual catalysis are greatly empowered by stereochemically dynamic metal-allyl
species. These in situ generated stereochemical mixtures
span a highly convoluted network of isomerization and bond-formation
pathways. While elucidation of these networks can offer valuable insights
that aid the design of more efficient and controllable reactions utilizing
stereochemically dynamic species as versatile intermediates, such
a task has challenged both experiments and computations due to the
combinatorial complexity and transient nature of the allylpalladium(II).
Here, we report extensive computational studies with experimental
validation that together provide full isomerization/bond-formation
networks for two recent systems of stereodivergent Pd/Cu dual catalysis.
We show that allylpalladium(II) can undergo a number of isomerization
processes prior to C(sp3)–C(sp3) formation,
and diastereoselection over the resulting diastereomeric mixture consisting
of multiple syn-/anti-allylpalladium
is independent of the copper-bound nucleophile. Moreover, critical
ligand control over the stereochemical composition of allylpalladium(II)
is disclosed, which is reliant upon the detailed positioning of ligand
steric hindrance. Surprisingly, such an effect is crucial for the
diastereoselection in a Pd/Cu dual-catalytic cross-coupling of 1,3-diene
with aldimine esters. The studies showcase how variations in ligand
structures cause distinct reaction flows in the reaction networks
of Pd/Cu dual catalysis through the lens of network-level computational
analysis.