Radical chemistry in polymer science: an overview and recent advances

• Zixiao Wang,
• Feichen Cui,
• Yang Sui and
• Jiajun Yan

Beilstein J. Org. Chem. 2023, 19, 1580–1603, doi:10.3762/bjoc.19.116

• materials used in additive manufacturing. It is also compatible to a photopolymerization process. For example, it can be applied to the photo-3D-printing of silicone resin [83]. The refractive index is one of the most important optical properties and researchers have invested plenty of effort to develop

• has been used to cure a liquid isoprene polymer in precise digital light processing 3D printing [105]. Recently, Kanbayashi et al. reported that thiol–ene chemistry would not cause racemization of an asymmetric center linked to a pendant vinyl group, which can be particularly valuable for

• photocrosslinking of polymers is also feasible in the presence of photoinitiators or photoresponsive moieties [136][137][138]. Sophisticatedly designed photocrosslinking of polymers finds broad applications in modern 3D printing/additive manufacturing [139][140][141][142]. Radical chemistry has been demonstrated as

Cyclodextrins as building blocks for new materials

• Miriana Kfoury and
• Sophie Fourmentin

Beilstein J. Org. Chem. 2023, 19, 889–891, doi:10.3762/bjoc.19.66

• biocompatible. Thus, these supra-architectures have a multitude of uses in food, biomedicine, regenerative medicine, cosmetics, molecular electronics, polymer chemistry, gold recovery, gas absorption, depollution, biochemical material sciences, nanotechnology, self-healing materials, 3D printing, and so on [19

Modern flow chemistry – prospect and advantage

• Philipp Heretsch

Beilstein J. Org. Chem. 2023, 19, 33–35, doi:10.3762/bjoc.19.3

• solutions from an engineering perspective, the advent of computer-aided design (CAD) in combination with widely available 3D printing has become a preferred choice. Prototyping aided by these technologies has significantly accelerated the development of novel flow reactor designs [14]. The challenging

Cryogels: recent applications in 3D-bioprinting, injectable cryogels, drug delivery, and wound healing

• Luke O. Jones,
• Leah Williams,
• Tasmin Boam,
• Martin Kalmet,
• Chidubem Oguike and
• Fiona L. Hatton

Beilstein J. Org. Chem. 2021, 17, 2553–2569, doi:10.3762/bjoc.17.171

• delivery and injectable cryogels, and we discuss 3D printing and wound healing in detail. Review 1. Cryogel synthesis Cryogels are produced by a cryogelation process, see Figure 1. While this process is relatively universal, differences exist in the initial materials used, hence resulting in either

• mechanical integrity [5][12][13][60]. Possessing shape memory allows for dehydration and storing; rehydration before use restores their original shape [37][60]. Here, we discuss emerging areas for cryogel application, including recent advancements in the use of cryogels in 3D printing, injectable cryogels

• , drug delivery and wound healing applications. It should be noted that whilst this section contains reference to tissue engineering, expansive detail on the subject matter is beyond the scope of this review. 5.1. 3D-Bioprinting of cryogels 3D-printing of biomaterials, or bioprinting, enables the control

An initiator- and catalyst-free hydrogel coating process for 3D printed medical-grade poly(ε-caprolactone)

• Jochen Löblein,
• Thomas Lorson,
• Miriam Komma,
• Tobias Kielholz,
• Maike Windbergs,
• Paul D. Dalton and
• Robert Luxenhofer

Beilstein J. Org. Chem. 2021, 17, 2095–2101, doi:10.3762/bjoc.17.136

• Chemistry, Department of Chemistry and Helsinki Institute of Sustainability Science, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland 10.3762/bjoc.17.136 Abstract Additive manufacturing or 3D printing as an umbrella term for various materials processing methods has distinct advantages

• ; surface modification; Introduction Additive manufacturing, commonly referred to as three-dimensional (3D) printing, is an approach to create physical objects using layer-by-layer [1] or voxel-by-voxel fabrication [2]. 3D printed materials can be used for a broad spectrum of applications, including

• medical devices where implants can be personalized to improve outcomes in patients [3]. Here, compliance to the regulatory pathway [4][5] is important, which favors solvent-free processing technologies of medical-grade raw materials. Solvent-free 3D printing approaches such as electron beam melting [6

A comprehensive review of flow chemistry techniques tailored to the flavours and fragrances industries

• Guido Gambacorta,
• James S. Sharley and
• Ian R. Baxendale

Beilstein J. Org. Chem. 2021, 17, 1181–1312, doi:10.3762/bjoc.17.90

• intermediates [140][141]. The introduction of 3D printing devices has aided flow chemistry, especially the prototyping of reactor designs (Scheme 25). The possibility to quickly investigate several reactors of different volumes, shapes, and materials increases the chance for applicability and improves the

• understanding of the process itself [142][143][144]. Benaglia et al. exemplified 3D printing with a copper-catalysed Henry reaction [145]. Benzaldehyde (17) and the homogenous catalyst were mixed with nitroethane and the DIPEA base solution in a 1 mL polylactic acid (PLA) square-channelled microreactor. The

Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors

• Emine Kayahan,
• Mathias Jacobs,
• Leen Braeken,
• Leen C.J. Thomassen,
• Simon Kuhn,
• Tom van Gerven and
• M. Enis Leblebici

Beilstein J. Org. Chem. 2020, 16, 2484–2504, doi:10.3762/bjoc.16.202

• photomicroreactors, which was fabricated via 3D printing [39]. Luminescent solar concentrators have been used in photovoltaic cell research for a couple of decades [40]. Noël’s group combined the use of luminescent solar concentrators with microfluidics to harvest solar radiation into a narrow wavelength region and

Heterogeneous photocatalysis in flow chemical reactors

• Christopher G. Thomson,
• Ai-Lan Lee and
• Filipe Vilela

Beilstein J. Org. Chem. 2020, 16, 1495–1549, doi:10.3762/bjoc.16.125

Low-budget 3D-printed equipment for continuous flow reactions

• Jochen M. Neumaier,
• Amiera Madani,
• Thomas Klein and
• Thomas Ziegler

Beilstein J. Org. Chem. 2019, 15, 558–566, doi:10.3762/bjoc.15.50

• this equipment we performed some multistep glycosylation reactions, where multiple 3D-printed flow reactors were used in series. Keywords: continuous flow; 3D printing; glycosylation; microreactor; multistep; Introduction The use of flow chemistry in comparison to batch chemistry shows great benefits

• ]. 3D-printing, also known as additive manufacturing, is a process, where the object is created layer by layer directly from the computer-aided design (CAD) model. There are different technologies available for printing continuous flow reaction devices like fused deposition modeling (FDM) [13][14

• well [29]. Although 3D printing of reaction devices is a growing field in the last years, there are only a few examples of organic reactions with FDM-printed reactors [7]. Reactors made of materials like PLA, ABS (acrylonitrile butadiene styrene) or HIPS (high-impact polystyrene) are described in the

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

• from adhesives, coatings, packaging materials, inks, paints, optics, 3D printing, microelectronics or textiles. From a synthetic viewpoint, photoredox catalysis, originally developed for organic chemistry, has recently been applied to the polymer synthesis, constituting a major breakthrough in polymer

• of sectors such as coatings, adhesives, paints, inks, composites, 3D-printing, dentistry, data storage ... [5][6][7]. Review 1 Photopolymerization processes and uses of photocatalysts (PCs) Traditionally, polymer manufacturing is made through thermal curing. However, this route has many limitations

• ) and the low content required. All these works on PC pave the way for highly reactive photosensitive systems that can be used for high tech applications: functional coatings, smart materials, new 3D printing resins, preparation of composites. Other development of PC can be expected in near future

NMR reaction monitoring in flow synthesis

• M. Victoria Gomez and
• Antonio de la Hoz

Beilstein J. Org. Chem. 2017, 13, 285–300, doi:10.3762/bjoc.13.31

• has been reported by Saggiomo and Velders [19] using 3D-printing technology. The authors described an easy two-step ABS (acrylonitrile butadiene styrene) scaffold removal method to obtain a 3D printed device inserted in a block of PDMS (polydimethylsiloxane). The authors tested this methodology for

3D printed fluidics with embedded analytic functionality for automated reaction optimisation

• Andrew J. Capel,
• Andrew Wright,
• Matthew J. Harding,
• George W. Weaver,
• Yuqi Li,
• Russell A. Harris,
• Steve Edmondson,
• Ruth D. Goodridge and
• Steven D. R. Christie

Beilstein J. Org. Chem. 2017, 13, 111–119, doi:10.3762/bjoc.13.14

• School of Materials, The University of Manchester, Manchester, M13 9PL, UK Faculty of Engineering, The University of Nottingham, Nottingham, NG7 2RD, UK 10.3762/bjoc.13.14 Abstract Additive manufacturing or ‘3D printing’ is being developed as a novel manufacturing process for the production of bespoke

• equipment, allowing automated online and inline optimisation of the reaction medium. This set-up allowed the optimisation of two reactions, a ketone functional group interconversion and a fused polycyclic heterocycle formation, via spectroscopic and chromatographic analysis. Keywords: 3D printing; inline

• reaction analysis; reaction optimisation; selective laser melting; stereolithography; Introduction Additive manufacturing (AM), or as it is widely known ‘3D printing’, is the internationally recognised term used to describe a wide range of manufacturing processes that can generate complex three

The digital code driven autonomous synthesis of ibuprofen automated in a 3D-printer-based robot

• Philip J. Kitson,
• Stefan Glatzel and
• Leroy Cronin

Beilstein J. Org. Chem. 2016, 12, 2776–2783, doi:10.3762/bjoc.12.276

• Philip J. Kitson Stefan Glatzel Leroy Cronin WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow G12 8QQ, UK 10.3762/bjoc.12.276 Abstract An automated synthesis robot was constructed by modifying an open source 3D printing platform. The resulting automated system

• was used to 3D print reaction vessels (reactionware) of differing internal volumes using polypropylene feedstock via a fused deposition modeling 3D printing approach and subsequently make use of these fabricated vessels to synthesize the nonsteroidal anti-inflammatory drug ibuprofen via a consecutive

• by the method described, opening possibilities for the sharing of validated synthetic ‘programs’ which can run on similar low cost, user-constructed robotic platforms towards an ‘open-source’ regime in the area of chemical synthesis. Keywords: 3D printing; digitising chemistry; ibuprofen; laboratory

Creating molecular macrocycles for anion recognition

• Amar H. Flood

Beilstein J. Org. Chem. 2016, 12, 611–627, doi:10.3762/bjoc.12.60

• group and I are also enjoying 3D printing of molecules (Figure 20), an activity that Ognjen Miljanic and I recently described [49]. Having early access to a full-color 3D printer in Indiana University’s School of Fine Arts helped my early adoption of holding and seeing molecules. Now we use it for

Camera-enabled techniques for organic synthesis

• Steven V. Ley,
• Richard J. Ingham,
• Matthew O’Brien and
• Duncan L. Browne

Beilstein J. Org. Chem. 2013, 9, 1051–1072, doi:10.3762/bjoc.9.118

• mixing was constant for the required time. Supporting Information File 2 shows the device in operation. Cronin and co-workers have recently reported the use of three-dimensional design software and an open-hardware 3D printing device to produce low-cost bespoke reactionware for applications in both

3D-printed devices for continuous-flow organic chemistry

• Vincenza Dragone,
• Victor Sans,
• Mali H. Rosnes,
• Philip J. Kitson and
• Leroy Cronin

Beilstein J. Org. Chem. 2013, 9, 951–959, doi:10.3762/bjoc.9.109

• Vincenza Dragone Victor Sans Mali H. Rosnes Philip J. Kitson Leroy Cronin School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK. Web: http://www.croninlab.com 10.3762/bjoc.9.109 Abstract We present a study in which the versatility of 3D-printing is combined with the

• ATR-IR flow cell. As a proof of concept, we utilized two types of organic reactions, imine syntheses and imine reductions, to show how different reactor configurations and substrates give different products. Keywords: 3D printing; flow chemistry; flow IR; in-line analysis; imine reduction; imine

• synthesis; millifluidics; reactionware; Introduction The use of flow chemistry and 3D-printing technology is expanding in the field of organic synthesis [1][2][3][4][5]. The application of continuous-flow systems is frequently found in chemistry, and is beginning to have a significant impact on the way

Light-induced olefin metathesis

• Yuval Vidavsky and
• N. Gabriel Lemcoff

Beilstein J. Org. Chem. 2010, 6, 1106–1119, doi:10.3762/bjoc.6.127

• dominate the field. Either by indirect or direct methods, the activation of ruthenium olefin metathesis catalysts may lead the way to novel applications in the areas of photolithography [81][82], roll-to-roll coating [69], 3D-printing, and self-healing [83] procedures in polymers. The use of