α-DICETO DIPHOSPHONATES ET HYDROXYMETHYLENE TETRAPHOSPHONATES SYNTHÈSE, STRUCTURE ET HYDROLYSE

Synthesis of methyl esters 3–8 or cyclic esters 3′–8′ of diketo-diphosphonates having n(CH2) are studied. These compounds lead to the corresponding symmetric 3a–8a and 3′a–8′a or disymmetric 3,3′a–8,8′a tetraphosphonates which are isomerized to the phosphates-phosphonates structures 4b–8b and 4′b–8′b. The hydrolysis reactions are also observed.