The structural unit A denotes the α-aryl substituent, where the electronic and steric of this ring are known to have a significant impact on the enantioselectivity of the DAAA reaction. We chose to represent the bias in the steric demand of this type of fragment by its 'stoutness' (van der Waals volume over longest perpendicular chain length, as proposed by Owen et al.) When this work was being undertaken, crystallographic data for these palladium complexes was sparse and their solution behavior is complicated by association phenomena. Due the absence of usable mononuclear crystallographic data at the time, catalyst fragments I-III were subjected to repeated MM2 force field dynamics in Chem3D until they converged to their lowest global strain energy. The obtained structures were checked against proposed and generally accepted transition-state models and each catalyst structure agreed with what would be predicted. In 2023, Arseniyadis and Leitch reported an excellent paper on the preparation of chiral, air stable, and reliable Pd(0) precatalysts for use in asymmetric allylic alkylation chemistry, such as DAAA. As part of their work, they reported Pd(0) complexes with Trost-type ligands. Significantly for our work, their paper contained X-ray crystallographic data that was previously not available. We were pleased to find that the structures we obtained after MM2 force field dynamics showed significant similarities to the crystallographic data in their report, suggesting that we had a good starting point for breaking down our three catalysts for featurization. For example, catalyst I shows a 'HC=CH-CH=CH' fragment is in the LR quadrant. By using Zhao's 23 approach these can approximated into an equivalent total steric burden without the need for complex molecular dynamics to be employed. This is shown in Figure for all catalyst families. Due to low exemplar numbers we only featurized the steric profile of the chiral space around catalysts I-III and did not include any electronic description, as these Trost-type ligands all likely to have similar electronic properties.