TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): The heterocyclic compound is prepared by performing intramolecular cyclization and demethylation reaction of 4,12-dithiatetracyclo(7.7.0.03.7.011.15)hexadeca-1,3(7),5,8,10,13,15-heptaene of formula (II).R=H, aryl or alkyl (both optionally substituted). Preferred Definitions:    R1,R2=H.    SPECIFIC COMPOUNDS - 32 heterocyclic compounds are disclosed e.g. 5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene of formula (A), 8,23-dimethyl-5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene, 8,23-diethyl-5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene, 8,23-dipropyl-5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene and 8,23-dibutyl-5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene.    EXAMPLE - 15 mL Trifluoromethanesulfonic acid and 60 mg diphosphorus pentachloride were added into a reactor and stirred at room temperature for 20 minutes under nitrogen atmosphere. 516 mg 2,7-Bis(2,2'-methylsulfinylbenzyl)naphtho(2,3-b:6,7-b')dithiophene was added to the resultant mixture, stirred and reacted at room temperature for 100 hours. The resultant reaction mixture was separated by filtration, washed with water, refluxed using 30 mL pyridine for 24 hours under nitrogen atmosphere, washed with water, acetone and dichloromethane and precipitated. The resultant precipitate was washed using acetone and chloroform and purified, to obtain 165 mg 5,13,20,28-tetrathiaoctacyclo(14.14.0.03.14.04.12.06.11.018.29.019.27.021.26)triaconta-1,3(14),4(12),6(11),7,9,15,17,19(27),21(26),22,24,29-tridecaene having yield of 37%.