Analogs of the carotane antibiotic fulvoferruginin from submerged cultures of a Thai Marasmius sp.

• Birthe Sandargo,
• Leon Kaysan,
• Rémy B. Teponno,
• Christian Richter,
• Benjarong Thongbai,
• Frank Surup and
• Marc Stadler

Beilstein J. Org. Chem. 2021, 17, 1385–1391, doi:10.3762/bjoc.17.97

• with an MCP 150 polarimeter (Anton Paar, Graz, Austria). The CD spectra were obtained from a JASCO spectropolarimeter, model J-815 (Pfungstadt, Germany). The UV spectra were recorded on a Shimadzu UV–vis spectrophotometer UV-2450 (Duisburg, Germany). Isolation and identification of fungal material

Photoinduced post-modification of graphitic carbon nitride-embedded hydrogels: synthesis of 'hydrophobic hydrogels' and pore substructuring

• Cansu Esen and
• Baris Kumru

Beilstein J. Org. Chem. 2021, 17, 1323–1334, doi:10.3762/bjoc.17.92

• calculated based on the measurement of 3 samples. Hydrogels treated with solutions were weighted separately (Ws), and the swelling ratio was calculated by using the following formula for each sample: a) FTIR spectra of freeze-dried HGCM-vTA, HGCM and HG. b) UV spectra of freeze-dried HGCM-vTA, HGCM and HG

Direct synthesis of anomeric tetrazolyl iminosugars from sugar-derived lactams

• Michał M. Więcław and
• Bartłomiej Furman

Beilstein J. Org. Chem. 2021, 17, 115–123, doi:10.3762/bjoc.17.12

• Information File 98: Experimental procedures, characterization data, ECD analyses for 5a and 2-epi-5a, calculations of appropriate ECD and UV spectra, crystallographic data for 3a and 3e, atomic coordinates, energies, and number of imaginary frequencies for computed stationary points, and copies of 1H and 13C

Nocarimidazoles C and D, antimicrobial alkanoylimidazoles from a coral-derived actinomycete Kocuria sp.: application of ¹J_C,H coupling constants for the unequivocal determination of substituted imidazoles and stereochemical diversity of anteisoalkyl chains in microbial metabolites

• Md. Rokon Ul Karim,
• Enjuro Harunari,
• Amit Raj Sharma,
• Naoya Oku,
• Kazuaki Akasaka,
• Daisuke Urabe,
• Mada Triandala Sibero and
• Yasuhiro Igarashi

Beilstein J. Org. Chem. 2020, 16, 2719–2727, doi:10.3762/bjoc.16.222

• observed during the study of bulbimidazole A (5), which did not show sp2 carbon signals in neutral solutions due to the presence of multiple resonance structures for the imidazole moiety [22]. We envisaged that due to the presence of an imidazole ring, the UV spectra of 1 and 5 would obviously be different

Formation of an exceptionally stable ketene during phototransformations of bicyclo[2.2.2]oct-5-en-2-ones having mixed chromophores

• Asitanga Ghosh

Beilstein J. Org. Chem. 2020, 16, 2297–2303, doi:10.3762/bjoc.16.190

• ][18] and dibenzoyl acetylene (9) followed by hydrolysis of the silyloxy adduct (Scheme 4). Both 7a and 7b showed an enhanced (n,π*) absorption band near 300 nm (log ε ≈ 3.5) along with an additional weak band near 343 nm (log ε ≈ 2.5) in their UV spectra as expected for δ-keto-α,β-enone [7

Muyocopronones A and B: azaphilones from the endophytic fungus Muyocopron laterale

• Ken-ichi Nakashima,
• Junko Tomida,
• Tomoe Tsuboi,
• Yoshiaki Kawamura and
• Makoto Inoue

Beilstein J. Org. Chem. 2020, 16, 2100–2107, doi:10.3762/bjoc.16.177

• experimental procedures Optical rotation values were recorded on a JASCO P-2200 polarimeter, while the UV spectra were obtained using a Hitachi U-2900 spectrophotometer. The ECD spectra were acquired on a JASCO J-820 spectropolarimeter and the IR spectra were recorded on a Shimadzu FTIR-8400S spectrophotometer

Synthesis and properties of quinazoline-based versatile exciplex-forming compounds

• Rasa Keruckiene,
• Simona Vekteryte,
• Ervinas Urbonas,
• Matas Guzauskas,
• Eigirdas Skuodis,
• Dmytro Volyniuk and
• Juozas V. Grazulevicius

Beilstein J. Org. Chem. 2020, 16, 1142–1153, doi:10.3762/bjoc.16.101

• results of theoretical calculations which revealed that the HOMO and LUMO orbitals of the carbazole-substituted quinazoline compound 1 overlap. Photophysical and electronic properties Figure 4 shows the theoretical UV spectra and experimental absorption spectra of dilute THF solutions of compounds 1–3

• . The theoretical UV–vis spectra of the derivatives had single absorption bands. The band at ca. 310 nm was characterized by a combination of various transitions towards several excited states. The theoretical UV spectrum of derivative 1 had a shoulder at 390 nm. In general, the experimental UV spectra

• of the derivatives 1–3 were consistent with the theoretical ones. The UV spectra of compounds 1, 2, and 3 had lowest energy bands (LEB) at 350, 280, and 325 nm, which were the main characteristics of the donor moieties in the structures, i.e., the carbazole, dimethyldihydroacridine, and phenothiazine

A cyclopeptide and three oligomycin-class polyketides produced by an underexplored actinomycete of the genus Pseudosporangium

• Shun Saito,
• Kota Atsumi,
• Tao Zhou,
• Keisuke Fukaya,
• Daisuke Urabe,
• Naoya Oku,
• Md. Rokon Ul Karim,
• Hisayuki Komaki and
• Yasuhiro Igarashi

Beilstein J. Org. Chem. 2020, 16, 1100–1110, doi:10.3762/bjoc.16.97

• bioinformatics and culture collections are available. Experimental General experimental procedures Optical rotations were measured using a JASCO DIP-3000 polarimeter. The UV spectra were recorded on a Hitachi U-3210 spectrophotometer. The IR spectra were measured on a PerkinElmer Spectrum 100. NMR spectra were

A simple and easy to perform synthetic route to functionalized thienyl bicyclo[3.2.1]octadienes

• Dragana Vuk,
• Irena Škorić,
• Valentina Milašinović,
• Krešimir Molčanov and
• Željko Marinić

Beilstein J. Org. Chem. 2020, 16, 1092–1099, doi:10.3762/bjoc.16.96

• shifts of the aromatic protons could be observed, with the proton chemical shift shifting upfield. The comparison of the UV spectra of the cis- and trans-isomers of compound 3 (Figure 4) showed the expected bathochromic and hyperchromic shifts of the trans-isomers, due to the planarity of the structure

• , which could be accompanied by a photochemical annulation. The photolysis spectra of compound's 3 isomers are shown in Figure 5, as representative examples. Figure 6 presents the UV spectra of products' 3–7 trans-isomers. All the isomers showed an absorption maxima between 300–400 nm. It can be noticed

• bicyclo[3.2.1]octenes/octadienes with cholinesterase inhibitory properties. 1H NMR spectra (CDCl3) for the trans-isomers 3–6. UV spectra in ethanol (95%) of the cis- and trans-isomers of compound 3. Photolysis spectra of cis-3 (a) and trans-3 (b) in ethanol (95%). UV spectra in ethanol (95%) of the trans

Absolute configurations of talaromycones A and B, α-diversonolic ester, and aspergillusone B from endophytic Talaromyces sp. ECN211

• Ken-ichi Nakashima,
• Junko Tomida,
• Takao Hirai,
• Yoshiaki Kawamura and
• Makoto Inoue

Beilstein J. Org. Chem. 2020, 16, 290–296, doi:10.3762/bjoc.16.28

• . Experimental General experimental procedures Optical rotations were measured using a JASCO P-1020 polarimeter, UV spectra were obtained on a Hitachi U-2900 spectrometer, and ECD spectra were acquired on a JASCO J-820 spectropolarimeter. IR spectra were recorded on a Shimadzu FTIR-8400S spectrophotometer, and

The interaction between cucurbit[8]uril and baicalein and the effect on baicalein properties

• Xiaodong Zhang,
• Jun Xie,
• Zhiling Xu,
• Zhu Tao and
• Qianjun Zhang

Beilstein J. Org. Chem. 2020, 16, 71–77, doi:10.3762/bjoc.16.9

• suggested that Q[8] included cycle B and part of cycle C of BALE into its cavity. To quantitatively determine the ratio of the host–guest inclusion complexes formed from Q[8] and the guest, the UV spectra of different aqueous solutions containing a fixed concentration of the guest (20 μmol·L−1) and variable

Two new aromatic polyketides from a sponge-derived Fusarium

• Mada Triandala Sibero,
• Tao Zhou,
• Keisuke Fukaya,
• Daisuke Urabe,
• Ocky K. Karna Radjasa,
• Agus Sabdono,
• Agus Trianto and
• Yasuhiro Igarashi

Beilstein J. Org. Chem. 2019, 15, 2941–2947, doi:10.3762/bjoc.15.289

• recorded on a Bruker AVANCE II 500 spectrometer (Bruker Biospin K. K., Yokohama, Japan) and mass spectra were measured on a Bruker micrOTOF (Bruker Daltonics K. K., Yokohama, Japan). IR spectra were recorded on a Shimadzu FT-IR-300 spectrophotometer (Shimadzu Corp., Kyoto, Japan) and UV spectra on a

1,2,3-Triazolium macrocycles in supramolecular chemistry

• Mastaneh Safarnejad Shad,
• Pulikkal Veettil Santhini and
• Wim Dehaen

Beilstein J. Org. Chem. 2019, 15, 2142–2155, doi:10.3762/bjoc.15.211

• -known “click chemistry”, followed by triple quaternization of two triazoles and one pyridine unit (Figure 12) [62]. This macrocycle (in its hexafluorophosphate form) binds three equivalents of acetate anions in acetonitrile solvent, according to the Job plot based on UV spectra at 365 nm. More

An azobenzene container showing a definite folding – synthesis and structural investigation

• Abdulselam Adam,
• Saber Mehrparvar and
• Gebhard Haberhauer

Beilstein J. Org. Chem. 2019, 15, 1534–1544, doi:10.3762/bjoc.15.156

• and switchable molecular container 5. Molecular structures of trans,trans-10 (left), cis,trans-10 (middle) and cis,cis-10 (right) calculated by means of B3LYP/6-31G*. All hydrogen atoms are omitted for the sake of clarity. UV spectra of the foldable container 10 in acetonitrile after synthesis (blue

• arranged to the macrocycles, but they show a left-hand twist (Figure 3 and Figure S1 in Supporting Information File 1). The trans→cis isomerization enhances this left-hand twist leading to a clockwise rotation of the two macrocycles towards each other. To prove the switching process experimentally, the UV

• spectra of the container 10 in acetonitrile as solvent were recorded (Figure 4). After the synthesis, the UV spectrum of the container shows an intensive band at 323 nm and a weak band at ca. 450 nm. The absorption at 323 nm corresponds to the π→π* transition, the second one is caused by the n→π

Diazocine-functionalized TATA platforms

• Roland Löw,
• Talina Rusch,
• Fynn Röhricht,
• Olaf Magnussen and
• Rainer Herges

Beilstein J. Org. Chem. 2019, 15, 1485–1490, doi:10.3762/bjoc.15.150

• ). The UV–vis spectra of 1 and 2 are shown before and after irradiation with 405 nm and 525 nm. Both diazocine-TATAs 1 and 2 exhibit similar UV spectra. The n→π* transition of cis-1 appears at 403 nm and at 494 nm in the trans-isomer. The corresponding absorption maxima in diazocine-TATA 2 are 409 nm

• activation energies (Ea) are calculated from the linear fit of an Arrhenius plot. Supporting Information Supporting Information File 526: Analytical methods, experimental procedures, NMR and UV spectra, kinetic studies and DFT calculations. Acknowledgements The authors gratefully acknowledge financial

Reaction of oxiranes with cyclodextrins under high-energy ball-milling conditions

• László Jicsinszky,
• Federica Calsolaro,
• Katia Martina,
• Fabio Bucciol,
• Maela Manzoli and
• Giancarlo Cravotto

Beilstein J. Org. Chem. 2019, 15, 1448–1459, doi:10.3762/bjoc.15.145

• toward MO, as seen in the UV spectra in Figure 6 and Figure 7. However, unlike the epichlorohydrin polymers, their “concentration-dependency” was not linear. The solution and solid state reactions showed similar yields, as can be concluded from Table 5. A significant difference was found between GPTS-β

Electrophilic oligodeoxynucleotide synthesis using dM-Dmoc for amino protection

• Shahien Shahsavari,
• Dhananjani N. A. M. Eriyagama,
• Bhaskar Halami,
• Vagarshak Begoyan,
• Marina Tanasova,
• Jinsen Chen and
• Shiyue Fang

Beilstein J. Org. Chem. 2019, 15, 1116–1128, doi:10.3762/bjoc.15.108

• UV spectra section of the Supporting Information File 2. dM-Dmoc phosphoramidite monomers and CPG with Dmoc linker. Structure of phosphoramidites containing electrophilic groups. ODN sequences 30a–e. Their 5'-tritylated versions are labeled as 30a-tr, 30b-tr, 30c-tr, 30d-tr, and 30e-tr, respectively

• Information File 182: HPLC profiles, MALDI–TOF MS spectra, UV spectra, and OD260 values of ODNs, and NMR spectra of new compounds. Acknowledgements Financial support from NIH (GM109288), Robert and Kathleen Lane Endowed Fellowship (S.S. and B.H.), David and Valeria Pruett Fellowship (D.E. and B.H.), and PHF

New terpenoids from the fermentation broth of the edible mushroom Cyclocybe aegerita

• Frank Surup,
• Florian Hennicke,
• Nadine Sella,
• Maria Stroot,
• Steffen Bernecker,
• Sebastian Pfütze,
• Marc Stadler and
• Martin Rühl

Beilstein J. Org. Chem. 2019, 15, 1000–1007, doi:10.3762/bjoc.15.98

• its validity. Experimental General Optical rotations were measured on a Perkin-Elmer 241 spectrometer, the UV spectra on a Shimadzu UV–vis spectrophotometer UV-2450. NMR spectra were recorded with a Bruker Avance III 700 spectrometer, equipped with 5 mm TCI cryoprobe (1H 700 MHz, 13C 175 MHz

Synthesis of polydicyclopentadiene using the Cp₂TiCl₂/Et₂AlCl catalytic system and thin-layer oxidation of the polymer in air

• Zhargolma B. Bazarova,
• Ludmila S. Soroka,
• Alex A. Lyapkov,
• Мekhman S. Yusubov and
• Francis Verpoort

Beilstein J. Org. Chem. 2019, 15, 733–745, doi:10.3762/bjoc.15.69

• catalytic activity of the Cp2TiCl2/organoaluminum compound is determined by the molar ratio of the components of the catalytic system [15]. The rate of transformation in the system depends both on the Al:Ti molar ratio and on the temperature [16]. UV spectra of toluene solutions of Cp2TiCl2 and AlEt2Cl

Synthesis and fluorescent properties of N(9)-alkylated 2-amino-6-triazolylpurines and 7-deazapurines

• Andrejs Šišuļins,
• Jonas Bucevičius,
• Yu-Ting Tseng,
• Irina Novosjolova,
• Kaspars Traskovskis,
• Ērika Bizdēna,
• Huan-Tsung Chang,
• Sigitas Tumkevičius and
• Māris Turks

Beilstein J. Org. Chem. 2019, 15, 474–489, doi:10.3762/bjoc.15.41

• 3.96–3.87 ppm to broad singlet at 4.60–3.95 ppm. Furthermore, a significant difference is observed also in the UV spectra. Product 8a has an additional absorption maximum at 370 nm (Figure 4). In the 7-deazapurine series the SNAr reactions between 2,6-diazido-9-methyl-7-deazapurine (3) and pyrrolidine

Synthesis of mono-functionalized S-diazocines via intramolecular Baeyer–Mills reactions

• Miriam Schehr,
• Daniel Hugenbusch,
• Tobias Moje,
• Christian Näther and
• Rainer Herges

Beilstein J. Org. Chem. 2018, 14, 2799–2804, doi:10.3762/bjoc.14.257

• separated by chromatography and the UV–vis spectra of the pure cis and trans isomers could be measured in an acetonitrile/water mixture. Figure 2 shows the UV spectra of the pure cis and trans isomers of 4. The nπ* band of the cis isomer displays an absorption maxima at λmax = 392 nm. Upon irradiation with

• trans isomer are between 1–7 days. These properties are ideal for applications in photopharmacology where the more bulky cis state is the inactive form and the trans isomer is the active configuration. Cis–trans isomerization of mono-functionalized S-diazocines 1–5. UV spectra of the S-diazocine 4 in

Nucleoside macrocycles formed by intramolecular click reaction: efficient cyclization of pyrimidine nucleosides decorated with 5'-azido residues and 5-octadiynyl side chains

• Jiang Liu,
• Peter Leonard,
• Sebastian L. Müller,
• Constantin Daniliuc and
• Frank Seela

Beilstein J. Org. Chem. 2018, 14, 2404–2410, doi:10.3762/bjoc.14.217

• nucleobases are located outside of the macrocycle. The intensity of NOE’s for the CH2 groups decreased with increasing distance (Supporting Information File 1, Figures S21 and S35). As the triple bonds of the macrocycles 4 and 8 are in conjugation to the nucleobases they influence the UV spectra and affect

Novel photochemical reactions of carbocyclic diazodiketones without elimination of nitrogen – a suitable way to N-hydrazonation of C–H-bonds

• Liudmila L. Rodina,
• Xenia V. Azarova,
• Jury J. Medvedev,
• Dmitrij V. Semenok and
• Valerij A. Nikolaev

Beilstein J. Org. Chem. 2018, 14, 2250–2258, doi:10.3762/bjoc.14.200

• (Supporting Information File 1, Figure S1). As it is evident from these data, the tricyclic diazodiketones 1b–e all have endo-configuration of the molecular structure. Analysis of the UV spectra of diazodiketones 1 shows that they have four absorption bands: two intense ones at 216–222 and 248–250 nm, and two

Synthesis of new p-tert-butylcalix[4]arene-based polyammonium triazolyl amphiphiles and their binding with nucleoside phosphates

• Vladimir A. Burilov,
• Guzaliya A. Fatikhova,
• Mariya N. Dokuchaeva,
• Ramil I. Nugmanov,
• Diana A. Mironova,
• Pavel V. Dorovatovskii,
• Victor N. Khrustalev,
• Svetlana E. Solovieva and
• Igor S. Antipin

Beilstein J. Org. Chem. 2018, 14, 1980–1993, doi:10.3762/bjoc.14.173

• clarity) and optimized complex structure of 10a with ADP (c) and ATP (d) according to DFT calculations. UV spectra of EY (1), 10b–EY (2), and 10b–EY in the presence of 0.005 (3), 0.05 (4), 0.5 (5) and 2 (6) mM of ADP (a) or ATP (b). Concentration (EY) = 5 µM, concentration (10b) = 6 µM, concentration (MES

• ) = 50 mM (pH 6.5). UV spectra of the AEPCDA polydiacetylene vesicles in the presence of different amounts of 10b; concentration (AEPCDA) = 0.2 mM, concentration (10b) = 0.002–0.1 mM in 10 mM MES buffer, pH 6.5. Photographs of a portion of a 96-well plate containing AEPCDA–10b polydiacetylene vesicles in

The phenyl vinyl ether–methanol complex: a model system for quantum chemistry benchmarking

• Dominic Bernhard,
• Fabian Dietrich,
• Mariyam Fatima,
• Cristóbal Pérez,
• Hannes C. Gottschalk,
• Axel Wuttke,
• Ricardo A. Mata,
• Martin A. Suhm,
• Melanie Schnell and
• Markus Gerhards

Beilstein J. Org. Chem. 2018, 14, 1642–1654, doi:10.3762/bjoc.14.140

• , whereas for the UV/IR/UV spectra the IR laser was fired 2.0–3.0 ns after the UV excitation laser. The time delay between UV excitation and ionizing laser was 4.0–4.5 ns. CP-FTMW setup The rotational spectroscopy measurements were performed with the Hamburg chirped-pulse Fourier transform microwave (CP