A procedure is presented which allows the six-carbon homologation of aldehydes to give the corresponding trienals viathe likely intermediacy of the novel 2-triphenylphosphranylidenemethyl-2H-pyran; application of this methodology to a short synthesis of the marine alarm pheromone, navenone B, is also described.
K. Hemming and R. J. K. Taylor, J. Chem. Soc., Chem. Commun., 1993, 1409 DOI: 10.1039/C39930001409
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