S pi n o ch r o m e E , h ex ahyd r ox y - I ,4 - na ph t h aq u i n o n e , ha s b e e n s y n t ti e s ised via co n d e ti s a ti o ii of 3,4,5,6 - tetra - met hoxyp h t ha lalde hyde with g lyoxal. ... THREE of the spinochrome pigments are simple poly- hydroxy derivatives of naplithaquinone ; spinochrome B is 2,3,5,7-tetrahydroxy-, spinochrome D is 2,3,5,7,8- pentahydroxy-, and spinochrome E is 2,3,5,6,7,8-hexa- hydroxy-1,4-naphthaquinone (IV ; R = H) .2 ... 7 K. Chandrasenan and ...
