The invention relates to the substituted 1,2-ethylenediamines of general formula ,wherein the groups R1 to R13, A, B, L and i are defined as in the description and the claims. A fuel gas and an oxygen-containing gas are supplied to the electricity generationcombustion means, and a combustion gas formed within the electricity generationcombustion chamber is discharged from the electricity generationcombustion chamber. The seat can change from a so-called seated position in which the back forms an angle with the sitting portion and its base is close to the rear transverse edge of the sitting portion to a so-called lying-down position in which it has a more or less level surface intended to accommodate a passenger in the lying down position.