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Commercially available reagent, (1,3-dioxan-2-yl-methyl)triphenylphosphonium bromide, sodium hydride and a catalytic amount of 18-crown-6 has proven efficient system for vinylic extension of ο-arylpolyenals.
The financial support by the Polish State Committee for Scientific Research (Grant 3T09 A 027 16) is gratefully acknowledged.
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