Abstract:Abstract:Results of research into four-membered 2-halo-1,2λ 5 -oxaphosphetane phosphorus(V)-heterocycles are presented. The preparation of 2-halo-1,2λ 5 -oxaphosphetanes by reaction of Phaloylides with carbonyl compounds is described. The mechanism of asynchronous [2+2]-сycloaddition of ylides to aldehydes was proposed on the base of low-temperature NMR investigations. 2-Halo-1,2λ 5 -oxaphosphetanes were isolated as individual compounds and their structures were confirmed by 1 Н-, 13 C-, 19 F-and 31 Р-NMR spec… Show more
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