1H, 13C, 31P NMR and conformational study of 7‐membered ring organophosphorus compounds. 1,3,2‐dioxaphosphepanes
- 1 August 1978
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Chemistry
- Vol. 11 (8) , 411-417
- https://doi.org/10.1002/mrc.1270110810
Abstract
The 1H, 13C and 31P NMR data of several 2‐R‐2‐thiono‐1,3‐dioxa organophosphorus molecules with 7‐membered rings [R = Cl, OC6H5, C6H5, CH3, N(CH3)2] are reported. The conformation of the 7‐membered ring is discussed by reference to the 3J(POCH) coupling constants which are compared with those observed in 6‐membered 1,3,2‐dioxaphosphorinanes. It is shown that caution must be exercised in using the 3J(POCH) angular dependence as a stereochemical tool. The 31P spin lattice relaxation times of some of these 7‐membered rings have been measured and the values are discussed.Keywords
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