4-naphthoquione Lawsone Naphthosemiquinoneradicals EPR Hydrogenbonding abstract 2-hydroxy-1,4-naphthoquinone;Lawsone(Lw)isanaturalcompoundfoundinhennaleaves.Thereaction oflawsonewith‘Na’metal(Lw-1),CH 3 COONa(Lw-2),NaOH(Lw-3),KOH(Lw-4),K 2 CO 3 (Lw-5)and Tris(hydroxymethyl)aminomethane(...