Fig. 8: Proposed catalytic cycle at this stage.

I Chain-walking isomerization. II Chemoselective and regioselective hydropalladation of regulator R vs. 1, 1′ & 1″. III H-transfer (major). IV Catalyst regeneration by isomerization and β-H elimination. V Catalyst regeneration by isomerization and β-H elimination. VI H-transfer (minor).