NOVELTY - Method comprises: e.g. (a) providing an optionally substituted precursor compound comprising a five- or six-membered heteroaryl ring; (b) treating the precursor compound with a strongly basic compound to induce the isomerization of the precursor compound; (c) treating the intermediate compound with an oxidizing agent to form a carbon-carbon bond between two intermediate compounds and form a bishalo-bisheteroaryl compound (A); and (d) optionally treating (A) with an organometallic compound to exchange a metal for the halogen substituents, and form a bismetallo-bisheteroaryl compound.    USE - The method is useful for synthesizing fused tricyclic compound, which is useful in a device (all claimed). The fused tricyclic compound is useful for making semi-conducting materials and/or organic electronic devices, and in printed electronics applications including transistors, thin-film transistor, field-effect transistory, photodetectors and photovoltaics, solar cells, light emitting diodes, organic light emitting diodes, sensors, displays, flat panel displays, radio-frequency identification, electronic paper and artificial skin. The fused tricyclic compound is useful: for making various light absorbing material, which is useful in the fields of sensing and nonlinear optics; and in various solution-phase processes including spin-coating, printing (e.g. inkjet printing, screen printing, pad printing, offset printing, gravure printing, flexographic printing, lithographic printing and mass-printing), spray coating, electrospray coating, drop casting, dip coating and blade coating.    ADVANTAGE - The method is capable of efficiently producing fused tricyclic compound in a cost effective and less time consuming manner.    DETAILED DESCRIPTION - Method comprises: (a) providing an optionally substituted precursor compound comprising a five- or six-membered heteroaryl ring having a halogen substituent at a first position on the heteroaryl ring; (b) treating the precursor compound with a strongly basic compound to induce the isomerization of the precursor compound to produce an intermediate compound, where the halogen atom is bound to a different position on the heteroaryl ring; (c) treating the intermediate compound with an oxidizing agent to form a carbon-carbon bond between two intermediate compounds and form a bishalo-bisheteroaryl compound of formula (Hal-HAr1-HAr1-Hal) (A); (d) optionally treating (A) with an organometallic compound to exchange a metal for the halogen substituents, and form a bismetallo-bisheteroaryl compound; and (e) reacting the bismetallo-bisheteroaryl compound with a suitable electrophile, or reacting (A) or bismetallo-bisheteroaryl compound with a nucleophile, to introduce a Z1 group, or its precursor for forming a fused tricyclic compound of formula (I), where either (I) comprises at least one R1 substituent covalently bonded to one or both of the HAr1 moiety which comprises 2, 3, or 4 heteroarylene moieties in conjugation with the HAr1 moiety, or (I) is subjected to one or more further reaction steps to form at least one R1 substituent covalently bonded to one or both of the HAr1 moiety which comprises 2, 3, or 4 heteroarylene moieties in conjugation with the HAr1 moiety, provided that R1 is not a thiophene compound of formula (II).    HAr1 = optionally substituted five or six membered heteroaryl ring comprising at least one ring carbon atom and at least one ring heteroatom;    Hal = halo;    Z1 = S, Se, NR5, C(O), C(O)C(O), Si(R5)2, SO, SO2, PR5, P(O)R5, BR5, C(R5)2, C=C(CN)2, or (C=C(CN2))2;    R5 = 1-50C organic radical comprising optionally substituted alkyl, perfluoroalkyl, aryl or heteroaryl,    m = 2-4;    R11, R12 = H, 1-18C alkyl, perfluoroalkyl, alkoxy or perfluoroalkoxy;    R13 = H, -B(-OR21)2, Si(R2)3, Si(OR2)3 or Sn(R2)3;    R21 = alkylene group bridging the O atoms (optionally substituted), alkyl or aryl;    R2 = alkyl or aryl; and    R1 = 2, 3, or 4 heteroarylene moieties.    INDEPENDENT CLAIMS are included for:    (1) synthesizing (I) with use of (A), comprising the steps (a) to (c) as above per se, and subjecting (A) to one or more further reaction steps to form (I), where either (A) comprises at least one R1 substituent covalently bonded to one or both of the HAr1 moieties which comprises 2, 3, or 4 heteroarylene moieties in conjugation with HAr1, or subjecting (A) to one or more further reaction steps to form at least one R1 substituent covalently bonded to one or both of the HAr1 moieties which comprises 2, 3, or 4 heteroarylene moieties in conjugation with HAr1;    (2) 48 heteroaryl compounds of formulae e.g. (IIa)-(IIj); and    (3) a composition comprising (IIa)-(IIj), and at least one of tricyclic compounds of formulae (XI)-(XIV).    In formula (IIa)-(IIj):    R4 = H or optionally 1-18C alkyl;    R5 = 1-50C organic radical comprising alkyl, aryl or heteroaryl; and    R1 = 2, 3, or 4-heteroarylene moieties in conjugation with the fused tricyclic core.    In formula (XI)-(XIV):    a, a1 = 0 or 1;    R1, R2 = alkyl, fluoroalkyl, aryl, fluoroaryl, heteroaryl, arylalkyl or heteroarylalkyl;    W1, W1a = at least one heteroarylene group;    b, b1a = 2-4;    c = 1-4;    X1, X1a = O, S, Se, NR3, PR3 or Si(R3)2;    R3 = alkyl, heteroalkyl or alkylaryl;    Y1, Y1a = N, P, CH, CR4 or SiR4;    R4 = H, alkyl, fluorinated alkyl, aryl, fluorinated aryl or heteroaryl;    Z1 = S, Se, NR5, C(O), C(O)C(O), Si(R5)2, SO, SO2, PR5, P(O)R5, BR5, C(R5)2, C=C(CN)2 or -(C=C(CN2))2-; and    R5 = 1-50C organic radical comprising optionally substituted alkyl, perfluoroalkyl, aryl or heteroaryl, provided that in formula (XI), if c is 1 and a and a1 are each zero, then (W1)b and (W1a)b1 are not (II).