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The bis-Wittig reaction with ɑ-dicarbonyl compounds has been used to prepare cyclopentadienes for subsequent use in the Diels-Alder reaction: J. Am. Chem. Soc., 111, 2351 (1989). For use in the synthesis of open-chain or cyclic polyenes, see: Liebigs Ann. Chem., 619, 10 (1958). Reaction with geranylacetone provides a one-step synthesis of norsqualene: Synthesis, 22 (1970)./n
For review of the bis-Wittig reaction in the synthesis of non-benzenoid aromatic compounds, see: Synthesis, 765 (1975)./n
Hazard Statements: H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P280a-P305+P351+P338-P304+P340-P405-P501a
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.