Aldehydes as powerful initiators for photochemical transformations

• Maria A. Theodoropoulou,
• Nikolaos F. Nikitas and
• Christoforos G. Kokotos

Beilstein J. Org. Chem. 2020, 16, 833–857, doi:10.3762/bjoc.16.76

• radical (10) was formed from 8. This was thought to be the initiating radical for the photoinitiated polymerization of monomeric MMA (26). The photochemical properties of aliphatic aldehydes have also been employed in photografting. Even if they are not the most efficient photoinitiators, aliphatic

• benzaldehyde (8). Aldehydes in the Paterno–Büchi reaction. 2,3-Diazabicyclo[2.2.1]hept-2-ene (DBH). Dissociation pathways of benzaldehyde. Reactions that lead to polarized products detectable by CIDNP. MMA (26), DEABP (27), and Michler’s ketone (28). Radical intermediates of DEABP. Photoinitiated

• polymerization of monomeric MMA (26) using the quinoxalines 32 and benzaldehyde (8). Acetone (4) and formaldehyde (35) as photografting initiators. Photografting by employing acetaldehyde (36) as the photoinitiator. Proposed photolysis mechanism for aliphatic ketones 44 and formaldehyde (35). Initiator 50

Organometallic vs organic photoredox catalysts for photocuring reactions in the visible region

• Aude-Héloise Bonardi,
• Frédéric Dumur,
• Guillaume Noirbent,
• Jacques Lalevée and
• Didier Gigmes

Beilstein J. Org. Chem. 2018, 14, 3025–3046, doi:10.3762/bjoc.14.282

• interest in the past few decades. The development of photoredox catalysts is one of the major advances. 1.1 Photoinitiating system (PIs) Photoinitiated polymerization processes are polymerizations initiated by light irradiation. For that, a photoinitiator (PI) or a photoinitiating system (PIs) is mixed

• catalytic cycles used in organic chemistry, the development of photoredox catalysis for photopolymerization reactions has been proposed. It has emerged as a significant innovation in the field of photoinitiated polymerization. Photoredox catalysis is a new strategy to generate radicals and/or cations upon

• soft irradiation [14]. 1.2 Development of photoredox catalysts In the field of photoinitiated polymerization, a photoredox catalyst is a photoinitiating system capable of regeneration during the polymerization reaction [14]. This regeneration is based on an oxidoreduction reaction between the light

Synthesis, characterization and photoinduced curing of polysulfones with (meth)acrylate functionalities

• Cemil Dizman,
• Sahin Ates,
• Lokman Torun and
• Yusuf Yagci

Beilstein J. Org. Chem. 2010, 6, No. 56, doi:10.3762/bjoc.6.56

• polymerization and conversion were evaluated. Thermal properties of the photochemically cured films were studied by differential scanning calorimeter (DSC) and thermal gravimetric analysis (TGA). Keywords: acrylates; photoinitiated polymerization; polysulfone; UV-curable oligomers; Introduction Polysulfones