NOVELTY - Preparing benzohetero(1,3) diazole compound disubstituted heteroaryl groups comprises reacting at least one disubstituted benzohetero(1,3) diazole compound with at least one heteroaryl compound.    USE - The process is useful for preparing benzohetero(1,3) diazole compound disubstituted heteroaryl groups (claimed). The benzohetero( 1,3) diazole compound disubstituted with heteroaryl groups is useful for constructing luminescent solar concentrators (LSC), photovoltaic devices (such as, for example, photovoltaic cells, photovoltaic modules, solar cells, and solar modules, on both rigid and flexible support); and as a precursor of monomeric units for preparing semiconductor polymers.    ADVANTAGE - The process provides the possibility of functionalizing the product obtained to be able to use it, for example, in polymerizations; direct use of the product obtained without the necessity of subjecting it to further treatments (e.g. purification) to eliminate by-products that can be formed during the reaction such as, for example, phosphine oxides; greater safety conditions (e.g. the absence of strong bases), for both the health of the operators and from an environmental point of view; and relatively short temperature and reaction times, with lower energy costs and shorter process times thus avoiding the possible degradation of the product obtained.    DETAILED DESCRIPTION - Preparing benzohetero(1,3) diazole compound disubstituted heteroaryl groups of general formula (I) comprises reacting at least one disubstituted benzohetero(1,3) diazole compound having general formula (II) with at least one heteroaryl compound having general formula (III).    W=represents an oxygen atom; a sulfur atom; an NR group where R represents a hydrogen atom, or a linear or branched 1-20C alkyl group;    Y=represents a sulfur atom; an oxygen atom; a selenium atom; an NR group;    R=represents a hydrogen atom, or a linear or branched 1-30C alkyl group;    Z=represents a nitrogen atom; or a CR2 group;    R1=represents a hydrogen atom; a linear or branched 1-20C alkyl group; a cycloalkyl group optionally substituted; an aryl group optionally substituted; a linear or branched 1-20C alkoxyl group; a polyethyleneoxyl group R-O-(-CH2-CH2-O)n-; a -COR group; a -COOR, a -CHO group; or a cyano (-CN) group;    n=an integer ranging from 1 to 4; a -R'-OH group;    R'=represents, a linear or branched 1-20C alkylene group; or a -R'-OR'' group;    R''=represents a linear or branched 1-20C alkyl group, or a polyethyleneoxyl group R-O-(-CH2-CH2-O)n-;    R3=represents a hydrogen atom; a linear or branched 1-20C alkyl group; a cycloalkyl group optionally substituted; an aryl group optionally substituted; a heteroaryl group optionally substituted; a -CHO group; a -COR group; a -COOR group; a -CONR2 group; or -CN group;    R2=represents a hydrogen atom; a linear or branched 1-20C alkyl group; or, when R3 is different from hydrogen, or when R1 is equal to R2, R2 represents a linear or branched 1-20C alkoxyl group; or R1 and R2, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; or R2 and R3 can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorus, or selenium;    R4 and R5=the same as each other, represent a hydrogen atom; a linear or branched 1-20C alkyl group; a linear or branched 1-20C alkoxyl group; a -COOR group; -CN group; - or R4 and R5, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorus, or selenium; and    X=represents a halogen atom selected from chlorine, fluorine, bromine, or iodine.