Abstract: A method of continuously draw-molding a fiber reinforced plastic rod formed with a spiral groove includes the steps of arranging in parallel a plurality of reinforcing fibers under tension, impregnating an unhardened thermosetting resin in the reinforcing fibers with tension being applied to the reinforcing fibers, winding a tape having a resin impregnable property and an expandible and contractible property around a fiber bundle composed of the thermosetting resin impregnated reinforcing fibers in a spiral fashion with a winding angle being substantially equal to an angle of the spiral groove with respect to an axial direction of a rod to be molded, passing the fiber bundle with the wound tape in a heating mold provided with a hole having a cross section substantially equal to that of the rod to be molded to heat and harden the thermosetting resin, and taking up the tape thereafter.

Abstract: 1,8-Naphthyridine compounds and a process for preparing chelated 1,8-naphthyridine derivatives and 1,8-naphthyridine derivatives which are pharmacautically useful compounds. Chelated 1,8-naphthyridine derivatives of the general formula [I]: ##STR1## wherein X and Y are independently a lower alkyl group, are prepared by subjecting a compound of the general formula [II]: ##STR2## wherein X and Y are as defined above and R is a lower alkyl group, to ring-closing condensation in the presence of boron trifluoride and/or a boron trifluoride complex at an elevated temperature, and 1,8-naphthyridine derivatives of the general formula [III]: ##STR3## wherein X and Y are as defined above, are prepared by treating the chelated 1,8-naphthyridine derivatives with water and/or an alcohol. The desired products can be readily obtained in high yields. The chelated compounds are novel compounds.