Azlactone photoiniferters for radical polymerization

A controlled radical polymerization photoiniferter comprising a compound of the formula:

• wherein R1 and R2 are each independently selected from H, an alkyl group, a nitrile, a cycloalkyl group, a heterocyclic group, an arenyl group and an aryl group, or R1 and R2 taken together with the carbon to which they are attached form a carbocyclic ring;
• R3 and R4 are each independently selected from an alkyl group, a cycloalkyl group, an aryl group, an arenyl group, a heterocyclic group or R3 and R4 taken together with the carbon to which they are attached form a carbocyclic ring;
• R5 and R6 arc each independently selected from an alkyl group, a cycloalkyl group, an aryl group, an arenyl group, or R5 and R6 taken together with the carbon to which they are attached form a carbocyclic ring;
• Q is a linking group selected from a covalent bond, aryl group, (—CH2—)o, —CO—O—(CH2)o—, —CO—O—(CH2CH2O)o—, —CO—NR8—(CH2)o—, —CO—S—(CH2)o—, where o is 1 to 12, and R8 is H, an alkyl group, a cycloalkyl group, and arenyl group, a heterocyclic group or an aryl group;
• and
• n is 0 or 1.