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The first efficient synthesis of jolkinolide A and B from the diosphenol ( 7 ) is reported; the new synthetic method described may find use in the preparations of 4-ylidene-2,3-substituted butenolides. ~

An annelated [17]annulenone (3) was prepared starting from o-ethynylcinnamaldehyde (1) in order to examine the effect of annelation on the ring current of the inner seventeen membered ring. It was found that two benzene rings reduce a paramagnetic ring current arising from polarization of a carbonyl group in the inner ring.