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Tetraphosphonate bicyclic trisanhydrides

  • US 6,326,490 B1
  • Filed: 10/10/1997
  • Issued: 12/04/2001
  • Est. Priority Date: 10/09/1996
  • Status: Expired due to Fees
First Claim
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1. A compound having the following structure:

  • wherein each of R1, R2, R3, and R4 is independently H, OH or F;

    X is O, S, mono- or di-halomethylene, or NR wherein R is H or alkyl, or CH2;

    Y is OH, SH or F; and

    each of W1 and W2 is independently H, OH, ═

    O, OR, SH, SR, NH2, NHR or NR2, wherein R is C1-C5 alkyl and n is an integer from 1 to 5.

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