Photolatent initiators

F. Hamazu, et al., Photopolymerization of epoxide by benzyl (para-hydroxy phenyl) methylsulfonium salts as novel photolatent initiators. Makromol. Chem. Rapid Commun. 1992, 13(4), 203-206. 

Reportedly, 5-benzyl-l,5-diazabicyclo[4.3.0]nonane is a very effective photolatent initiator [26,32]. It releases l,5-diazabicyclo[4.3.0]non-5-ene (DBN), a bicyclic amidine possessing a high basicity (pKa= 12 —13) due to the strong conjugative interaction between the two nitrogens. The suggested release mechanism is... 

Thiols and thiolate anions are very good nucleophiles. Various click reactions have been developed based on the nucleophilic attack of thiols on to the electrophilic substrates such as epoxides, isocyanates, halides, and Michael acceptors. The reactions are generally initiated by bases, which are added in catalytic amounts or are produced in catalytic amounts by photolatent bases that act as photoinitiators for these reactions [48]. The rates of these reactions are dependent on the substrates... 

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