Introduction of hetero atoms into π-conjugation systems has attracted attention in the field of materials science as well as organic synthesis owing to unique electronic and photochemical properties of  resulting π-extended heteroaromatics. The invention is novel planar triarylphosphines, the aryl groups of which are directly bounded in such a way to give rise to an extended π-system. It has posibility that making new organic electronics device eraborating with heteroaromatics.  

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