SYNTHESIS AND OPTICAL PROPERTIES OF NEW DENDRMERS BASED ON 6,8-DINITROQUINAZOLINE AND 3,5-DIMERCAPTOBENZYL BLOCKS Hideki Miki, Shiyoshi Yokoyama, and Shinro Mashiko Abstract Two types of core-shell structured dendrimer, 2,4-bis-{3,5-bis-[3,5-bis(3,5-di-tert-butylbenzylthio) benzylthio]benzyloxy}-6,8-dinitroquinuoline(7a) and 2,4-bis-{3,5-bis-[3,5-bis-(3,5-di- tertbutylbenzy1oxy) benzyloxy] benzyloxy}-6,8-dinitroquinazoline (7b) were synthe sized and their spectral properties were measured. These compounds contained 6,8-dinitroquinazoline ring as the functional uinit and 3,5-dimercaptobenzyl or 3,5-dihydroxybenzyl group as the dendritic uinit. In order to protect sulfur atom from the oxidation reaction (7a), 3,di-tert-butylbenzyl group was designed as the most outer unit in this dendrimer. Synthesized dendrimer containing sulfur atom (7a) is completely novel, and is interested in the level of influence on d-orbital electron properties as a photelectronic material.