Abstract: An electric small-sized vehicle, in particular an electric scooter, having a rear wheel, a frame, a support with a foot board and a wheel folding mechanism. The support includes a rear support section connected to the rear wheel, a front support section connected to the frame, and a receiving area for the rear wheel. The wheel folding mechanism has a first joint with a first pivot axis. The vehicle is adjustable from an unfolded position into a folded position via the joint. The front support section is connected to the rear support section by the first joint. In the unfolded position, the rear wheel is positioned in an outer position where the rear wheel is arranged outside of the receiving area, and in the folded position, the rear wheel is positioned in an inner position where the rear wheel is at least partly arranged within the receiving area.

Abstract: Naphthalimide derivatives of the general formula ##STR1## where R.sup.1 is hydrogen or C.sub.1 - to C.sub.4 -alkyl,R.sup.2 is nitrile or a radical containing a carbonyl group or an acetalized carbonyl group andR.sup.3 and R.sup.4 are unsubstituted or substituted alkyl.The compounds are excellent optical brighteners, especially for synthetic fibers.