The preparation and the use in olefin synthesis of two 5-membered cyclic phosphonates, 2- carbethoxy-methyl 4, 5-dimethyle-2-oxo-1, 3, 2-dioxaphospholane (4b) and 2-cyanomethyl- 4, 5-dimethyl-2-oxo-1, 3, 2-diox-aphospholane (4c) and the 6-membered phosphonates, 2- carbalkoxymethyl-5, 5-dimethyl-2-oxo-1, 3, 2-diox-aphosphorinanes (5a and 5b) and 2- cyanomethyl-5, 5-dimethyl-2-oxo-1, 3, 2-dioxaphosphorinane (5c) are described. ...
[Ryu, Ilhyong; Kusano, Kazuya; Hasegawa, Mitsuharu; Kambe, Nobuaki; Sonoda, Noboru Journal of the Chemical Society, Chemical Communications, 1991 , # 15 p. 1018 - 1019]
![2-[(ethoxycarbonyl)methyl]-2-oxo-4,5-dimethyl-1,3,2-dioxaphospholane Structure](https://image.chemsrc.com/caspic/336/72258-75-4.png)
![2-[(ethoxycarbonyl)methyl]-2-oxo-5,5-dimethyl-1,3,2-dioxaphosphorinane Structure](https://image.chemsrc.com/caspic/401/67889-05-8.png)
