TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The condensed ring compound of formula (II) is obtained by removing protecting group from dioxolane compound of formula (A) and forming carbonyl group.R33,R34=H, halo or monovalent group;Z31=-O-, -S-, -Se-, -Te-, -S(=O)-, -S((=0)2)-, -C(-R81)=C(-R82)-, -C(-R83)=N- or -N(-R84)-;Z32=-O-, -S-, -Se-, -Te-, -S(=O)-, -S((=0)2)-, -C(-R71)=C(-R72)-, -C(-R73)=N- or -N(-R74)-;R71-R74= H, halo, or monovalent group;R',X',Z'=R71;andR",Z"=Z31. Preferred Definitions:    X11,X12,X21,X22=oxygen;    group (i)=group of formula (ii);    R41=H, halo, 1-20C alkyl, 1-20C fluoroalkyl, 1-20C alkoxy, or 1-20C fluoroalkoxy;    Z41=Z31, preferably -S- or -C(-R81)=C(-R82)-;    R81-R84=R71;and    orR81+R82=ring.    SPECIFIC COMPOUNDS - 3 Condensed ring compounds are disclosed i.e. 6,7-dibutyl-1-(5,5-difluoro-4,6-dioxo-3aH,4H,5H,6H,6aH-cyclopenta(b)thiophen-2-yl)-3-(5,5-difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4H,9H-naphtho(2,3-c)thiophene-4,9-dione of formula (Ia), 1-(5,5-difluoro-4,6-dioxo-3aH,4H,5H,6H,6aH-cyclopenta(b)thiophen-2-yl)-3-(5,5-difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-6,7-dihexyl-4H,9H-naphtho(2,3-c)thiophene-4,9-dione and 1-(5,5-difluoro-4,6-dioxo-3aH,4H,5H,6H,6aH-cyclopenta(b)thiophen-2-yl)-3-(5,5-difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-6,7-didodecyl-4H,9H-naphtho(2,3-c)thiophene-4,9-dione.    EXAMPLE - Tributyl(2',2'-difluoro-2'H-dispiro(1,3-dioxolane-2,1'-cyclopenta(b)thiophene-3',2''-(1,3)dioxolane)-5'-yl)stannane (in mg) (150), 1,3-dibromo-6,7-dibutyl-4H,9H-naphtho(2,3-c)thiophene-4,9-dione (58), tetrakis (triphenylphosphine) palladium(0) (25) and toluene (1 ml) were refluxed for 15 hours in presence of nitrogen. The obtained reaction liquid was filtered, concentrated under reduced pressure and purified, to obtain yellow solid (104) as intermediate component. The obtained yellow solid, tetrahydrofuran and concentrated sulfuric acid were heated at 60 degrees C, cooled, chloroform was extracted and filtered. The obtained organic layer was concentrated under reduced pressure and purified, to obtain 6,7-dibutyl-1-(5,5-difluoro-4,6-dioxo-3aH,4H,5H,6H,6aH-cyclopenta(b)thiophen-2-yl)-3-(5,5-difluoro-4,6-dioxo-4H,5H,6H-cyclopenta(b)thiophen-2-yl)-4H,9H-naphtho(2,3-c)thiophene-4,9-dione in yield of 86%.