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• W2015399989 abstract "Reaction of salicylaldehydes with tetraethyl ester of methylenebisphosphonic acid, under Knoevenagel reaction conditions, gives the corresponding 1,2-benzoxaphosphorin-3-phosphonates 5 in good yields. The [3+2] regio- and stereoselective cycloaddition of 5a and 5b with ethyl diazoacetate gives two P-4 epimers of the corresponding pyrazoline bisphosphonate tetraethyl esters 9 and 10. Analogously, ethyl diazoacetate reacts with 1 and 2 to give the expected pyrazolines 6–8. The structures of the new compounds are revealed and confirmed by analytical, spectroscopic data and X-ray crystallographic analysis." @default.
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• W2015399989 date "2009-02-01" @default.
• W2015399989 modified "2023-10-17" @default.
• W2015399989 title "Synthesis of heterocyclic methylenebisphosphonates by 1,3-dipolar cycloaddition of ethyl diazoacetate to 1,2-benzoxaphosphorin-3-phosphonates" @default.
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• W2015399989 doi "https://doi.org/10.1016/j.tet.2008.12.048" @default.
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