The value of 2JP–CO as a diagnostic parameter for the structure and thermal reactivity of carbonyl-stablised phosphonium ylides
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A survey of 20 carbonyl-stabilised phosphonium ylides with recently reported X-ray structures shows a strong correlation between the C=P to C=O torsion angle and the value of 2JP–CO, with high values being associated with an anti configuration and low with syn. Seven new X-ray structural determinations are reported, several for types of ylide not crystallograpically characterised before, and these also conform to this pattern. The value of 2JP–CO is then correlated with whether or not thermal extrusion of Ph3PO occurs to give alkynes for over 200 ylides and an empirical rule developed that the extrusion never occurs for ylides where this value is >11 Hz. This is used to rationalise the anomalous behaviour of some trioxo ylides and cyclic ylides, two of which afford cycloalkynes, isolated after rearrangement as the isomeric 1,3-dienes. The rule also holds for a family of novel highly fluorinated ylides which afford fluorinated alkynes in good yield upon flash vacuum pyrolysis.
Aitken , R A , Boubalouta , Y , Chang , D , Cleghorn , L P , Gray , I P , Karodia , N , Reid , E J & Slawin , A M Z 2017 , ' The value of 2 J P–CO as a diagnostic parameter for the structure and thermal reactivity of carbonyl-stablised phosphonium ylides ' , Tetrahedron , vol. 73 , no. 44 , pp. 6275-6285 . https://doi.org/10.1016/j.tet.2017.09.016
© 2017 Elsevier Ltd. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.tet.2017.09.016
DescriptionThe authors thank the EPSRC (U.K.) for a DTA Studentship (Grant No. EP/P505712/1)
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