No abstract

Some pH indicators for use in optode membranes based on cellulose acetate have been prepared, and applications of membranes containing octyl bis (2,4-dinitrophenyl)acetate in static and flowing systems are discussed.

The synthesis of 3-amino-6-(p- methylphenoxy )isoquinoline-4-carbaldehyde in two steps from the corresponding ethyl ester is reported. Further ring annulations by Friedlander synthesis are described to give, for example, new tetra- and penta -cyclic systems ( benzo [f] pyrimido [4,5-b][1,8] naphthyridine and benz [f] indolo [3,2-b][1,8] naphthyridine ).

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