The ortho-ylides (4) are isolable compounds which on heating give a variety of products, including the ethers (5) formed by a [1,4] sigmatropic rearrangement; the para-ylides (11) are less stable, and above 0° the ylides (11a and b) undergo consecutive [2,3] and [3,3] sigmatropic rearrangements whereas the ylides (11c–e) apparently react by homolytic fission and recombination.
S. Mageswaran, W. D. Ollis, I. O. Sutherland and Y. Thebtaranonth, J. Chem. Soc., Chem. Commun., 1973, 651 DOI: 10.1039/C39730000651
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