Bicarbonate precursors, method for preparing same and uses thereof

A compound of following formula (I):

• where:
• R1 is H or a straight-chain or branched alkyl group comprising 1 to 20 carbon atoms,
• A1 is a divalent straight-chain or branched alkylene radical comprising 2 to 14 carbon atoms, and
• A2 is a —O-A4-O— radical, A4 being a divalent straight-chain or branched alkylene radical comprising 1 to 20 carbon atoms, optionally comprising one or more substituents, or being interrupted by one or more groups chosen in particular from the group formed by the phenylene radical and the radical of formula —(CH2OCH2)n—, n representing an integer of between 1 and 100, or A2 is a radical of formula —(OCH2CH2)n—O—, n being as previously defined.