Patent ID: 8791298

Claim:
A compound of formula (5) wherein R 1 is phenyl substituted with 1 to 5 electron withdrawing substituents —N(R 100 R′ 100 R″ 100 ) 3 + A − , wherein R 100 , R′ 100 and R″ 100 independently are hydrogen, C 1 -C 18 alkyl or phenyl or two of R 100 , R′ 100 and R″ 100 together with the nitrogen atom to which they are bonded form a 5 or 6 membered-ring which may contain a further nitrogen atom and A − is an anion or R 1 together with the electron withdrawing substituent is a group where * is the point of attachment; R 2 denotes hydrogen, unsubstituted or substituted C 1 -C 28 alkyl, C 2 -C 28 alkenyl, C 2 -C 22 alkinyl, C 3 -C 12 cycloalkyl, C 3 -C 12 cycloalkenyl, C 7 -C 9 aralkyl, C 3 -C 20 heteroalkyl, C 3 -C 12 cycloheteroalkyl, C 5 -C 16 heteroaralkyl, unsubstituted or substituted aryl or unsubstituted or substituted heteroaryl; and R 5 , R 6 , R 7 and R 8 independently from each other are hydrogen, unsubstituted or substituted C 1 -C 28 alkyl, C 2 -C 28 alkenyl, C 2 -C 22 alkinyl, C 3 -C 12 cycloalkyl, C 3 -C 12 cycloalkenyl, C 7 -C 9 aralkyl, C 3 -C 20 heteroalkyl, C 3 -C 12 cycloheteroalkyl, C 5 -C 16 heteroaralkyl, unsubstituted or substituted phenyl or naphthyl, —OR 100 , —NR 100 R′ 100 , halogen or a group or independently have the meaning as defined for R 1 or R 5 and R 6 , R 6 and R 7 or R 7 and R 8 are linked together to form 1, 2, 3 or 4 carbocyclic or heterocyclic rings which may be uninterrupted or interrupted by one or more —O—, —S— or —NR 9 — and/or which may be further fused with other aromatic rings and/or which may be substituted with one or more C 1 -C 6 alkyl groups.