New di:keto-phosphonate ester cpds. useful as intermediates for vitamin=D or derivs.

摘要

Diketophosphonate esters of formula (I) are new R1, R2, R4 = H or lower alkyl; R3 = lower alkyl. N.B. in the disclosure, the R3 in COOR3 may be different from those in PO(OR3)2.