Answers are grounded in this paper and cite their sources.
The formation of bis-lactones of type 2 from 1 (XH) and CO is catalyzed by PdII. Substituents on C-2 and C-3 are largely tolerated. In comparison, 1 (XAc) forms only open-chain 1,3-dienes in the presence of Pd0.
No takes yet. Share an insight, caveat, or question.
Tamaru et al. (1985) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: