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2,2-Dichlorovinylbisphosphonate 6 can be prepared from currently available 1-amino-2,2,2-trichloro-ethanebisphosphonate 5 by deamination/dechlorination. Synthesis and reaction of keteneacetals 8, 10, 13, 14, 16, keteneimine 9 and bisphosphonoacetamides 11, 15 are reported. Tautomeric equilibriums between ketene-N,N-acetals 10, 16 and bisphosphonoacetamidines 12, 17, respectively, are described.
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