SCHEDULED MAINTENANCE
The base catalysed isomerisations (Ia → IIIa + VI), (Ib → VIII), (Xa → IXa), (Xb → IXb), (Va → XI + XIIa), and (Vb → IXc + XIIb) involve the sequence: acetylene → allene isomerisation, intramolecular (π4+π2) cycloaddition, and sigmatropic or prototropic hydrogen shift.
A. J. Bartlett, T. Laird and W. D. Ollis, J. Chem. Soc., Chem. Commun., 1974, 496 DOI: 10.1039/C39740000496
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