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3.Isomers of type 7 were not detected. By means of this method 2,3-disubstituted, 2,4,5-trisubstituted, and 2,3,4,5tetrasubstituted h3-phosphorins 3 have become accessible (Table I).phosphonate 3b is formed via the phosphorous acid ester by propargyl rearrangement [']. The addition product obtained from 3b on reaction with sodium ethoxide is hydrolyzed with hydrochloric acid to the p.6-dioxophosphonate 4b, previously prepared via anotherThe intramo-By analogy to a-pyrones 2, cyclopentadienones 8 react with 5 via elimination of CO to furnish pentasubstituted h3-phosphorins (e. g. 3f, R2 = R5 = C2H5, R3 = R4 = C6Hsr m.p.= 179°C). m. p. = 182-184°C; 3g, R2= Rs = CH3, R 3 = R4= C~H S , R4&R2R4 R3 R5 P' Ph 7 0

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