Magnetic Resonance in Chemistry p. 929 - 934 (1985)
Update date:2022-07-29
Topics:
Quin, Louis D.
Bernhardt, F. Christian
The first phosphines based on the benzo-7-phosphanorbornene system have been prepared and found to have extremely deshielded 31P nuclei.The phosphine with a P-tert-butyl group gives the most downfield value (δ +152.5) ever recorded for a tertiary phosphine.The lone-pair orientation in phosphines controls the magnitude of 2J (PC) and 3J (PC), and these effects were used to determine stereochemical features of the phosphines.These compounds were formed by HSiCl3-pyridine reduction of the Diels-Alder adducts of isophosphindole oxides with norbornadiene. 13C NMR was also used to confirm the assignment of these phosphine oxides.
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