| abstract |
A compound of formula (I)for use in electrolyte compositions for electrochemical cells, wherein R1 and R2 are selected independently from each other from H, F, CN, R′, OR′, OC(O)R′, and OP(O)R″2, R3 is selected from H, C1 to C12 alkyl, C3 to C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C5 to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl, R4 is selected from C1 to C12 alkyl, C3 to C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C5 to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl, or R3 and R4 are bound together and form together with the group —C—C(O)—O— a 5- to 6-membered heterocycle which may be substituted by one or more substituents selected from F and optionally fluorinated C1 to C12 alkyl. |