[EN] SYNTHESIS OF SPIRO ORTHO ESTERS, SPIRO ORTHO CARBONATES, AND INTERMEDIATES [FR] SYNTHESE DE SPIRO-ORTHO-ESTERS, DE SPIRO-ORTHO-CARBONATES ET D'INTERMEDIAIRES
[EN] SYNTHESIS OF SPIRO ORTHO ESTERS, SPIRO ORTHO CARBONATES, AND INTERMEDIATES [FR] SYNTHESE DE SPIRO-ORTHO-ESTERS, DE SPIRO-ORTHO-CARBONATES ET D'INTERMEDIAIRES