The stereoselectivity of salt-free Wittig reactions is discussed in terms of a new mechanism in which the stereoselectivity arises from cleavage of the trans-oxaphosphetan as opposed to the formation of the cis-oxaphosphetan.
J. D. Thacker, M. Whangbo and J. Bordner, J. Chem. Soc., Chem. Commun., 1979, 1072 DOI: 10.1039/C39790001072
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