Synthesis of Organic Functionality Materials by Use of Trithio-Cyclopropenium Ion

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Main interest has so far been directed toward theoretical investigation of electronic structures and physical properties etc. of cyclopropenium ion, cyclopropenone, and cyclopropenethione, samllest membered-ring aromatic systems. On theother hand, this research project was largely concerned in developing upique reactions due to a highly-strained three-membered ring opening of the above <pi>-electron compounds and furthermore in synthesizing new types of <pi>-electron systems with novel physicla properties and functions. During this research period the following two reactions were found out. (1) In the presenceof a tri-n-butylphosphine catalyst, bis(hydroxyphenyl) cyclopropenethione was subjected to dimerization, and a redox-active tetrakis(hydroxyphenyl)thieno[3,2-b]thiophene was obtained, which constructs a stable and distinct three-color organic electrochromic system with its two- and four-electron oxidized partner. (2)Very polarized dicyano-dithio- and -diphenyl calicenes reacted with diaminofulvene to afford new types of (pi)-electron systems, diaminoazulenofulvene and quinoid-type pentalene, of which the former compound has a large contributionof the polar structure in the ground state, thus giving much expectation as a promising component for non-linear optoelectronics.The present research also made a large progress in calicene chemistry. Thus,cyclic n-calicenes were synthesized, and their electronic structures were elucidated by the results of NMR, X-ray structural analysis, and MO calculations.