▎ 摘　　要

NOVELTY - Preparing a multicyclic structure comprises cyclizing a compound comprising repeat units of substituted heterocyclyl compounds (I). At least one of the repeat units comprises (R1) moiety (r1a). USE - The process is useful for preparing a multicyclic structure and a conjugated, polyaromatic compound (all claimed), preferably graphene substructures and ribbons that are used in electronic applications. ADVANTAGE - The process: enables the synthesis of oligo-alkyne and poly-alkyne chains having wide variety of structural and functional features; allows significant flexibility and linkage of any two or more aromatic-alkyne groups having different structures from each other; and utilizes cascade transformations to prepare graphene nanoribbons and graphene substructures of nearly any design. DETAILED DESCRIPTION - Preparing a multicyclic structure comprises cyclizing a compound comprising repeat units of substituted heterocyclyl compounds of formula (I). At least one of the repeat units comprises (R1) moiety of formula (r1a). n = at least three and less than 25, preferably 4-25; R1a-R4a = C or N; and R1-R4 = aliphatic moiety or alkoxy (both optionally substituted) or H, where the substituents of aliphatic moiety is Cl, Br, amino or cyano; and R1a-R4a = C; and R1-R4 = H or aliphatic moiety optionally substituted with Cl, Br, amino or cyano; or two adjacent R1a-R4a, R1-R4 = naphthalene or anthracene; T1, T2 = H, 1-18C aliphatic moiety, 3-18C aromatic moiety, 1-6C alkoxy or cyano; Y1 = Br, I, xanthyl or carbonyl compound which can be converted into a radical; and Z1 = O, S, S(O), SO2, CH2, or NCH3. An INDEPENDENT CLAIM is also included for a conjugated, polyaromatic compound prepared by cyclizing (I).