6 article(s) from Wegner, Hermann A
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- Published 30 Jun 2022
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Scheme 1: Baeyer–Mills reaction of AB (1a) involving nucleophilic attack of aniline (2a) to nitrosobenzene (3...
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Figure 1: Flow setup for optimization of the Baeyer–Mills reaction with aniline (2a) and nitrosobenzene (3). ...
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Figure 2: Optimization of the Baeyer–Mills reaction of nitrosobenzene (3) with aniline (2a) to AB (1a). The n...
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Figure 3: Flow setup after prior optimization with unsubstituted aniline (2a) and nitrosobenzene (3) to AB (1a...
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Scheme 2: Large-scale synthesis of AB 1t from aniline 2t and nitrosobenzene (3) in >99% yield within 3 days.
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- Published 03 Jan 2020
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Figure 1: 1,3,5-Tris(arylazo)benzenes as individually switchable multistate photoswitches: previous [11,12] and pres...
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Scheme 1: Synthetic strategy towards 1,3,5-tris(arylazo)benzenes 3 based on consecutive Baeyer–Mills reaction...
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Scheme 2: Preparation of tris(arylazo)benzenes 3 by Pd-catalyzed cross-coupling reactions of N-Boc-arylhydraz...
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Scheme 3: Synthesis of azobenzene building block 8.
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Scheme 4: Synthesis of 1,3-bis(4-methoxyphenylazo)-5-phenylazobenzene (14).
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Scheme 5: Synthesis of unsymmetrical tris(arylazo)benzenes 3a/3b using Pd-catalyzed coupling reactions and Cu...
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Scheme 6: Coupling reactions of 15 with the corresponding arylhydrazides to access monocoupled (16a/16b) and ...
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Figure 2: a) UV–vis spectra of tris(arylazo)benzenes 3a/3b in ethanol. b) Reversible photoisomerization of 3a...
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- Published 30 Sep 2019
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Figure 1: Methane, fluoromethane, and difluoromethane in Lewis representation (top, left to right), in ball a...
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Figure 2: Multiple allocations of molecules to PI classes. Molecules that can be allocated to a group on the ...
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Figure 3: Left: benzene from two different angles, PI code of benzene: PI = 1/2D/C3H3/cX1-1-2-3-X2-X3-X1/h1-3...
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Figure 4: The atom carbon by Patrick Borchers (left) and Christoph Kern (right).
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Figure 5: Artistic interpretation by Jette Flügge of the atoms hydrogen, carbon, nitrogen, oxygen, and fluori...
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Figure 6: Hangings of methane (CH4), fluoromethane (CH3F), and difluoromethane (CH2F2) (from left to right) b...
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- Published 29 May 2018
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Scheme 1: Half-lives for the thermal Z→E isomerization of all-meta-alkyl-substituted azobenzenes 1–3 in DMSO ...
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Scheme 2: Isomerization of N-substituted Z-azobenzenes (a). Rotational equilibrium of (Z)-4 allowing intramol...
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Figure 1: a) Optimized geometry of open conformer (R,S)-4 c0. b) NCI plot of the most stable conformer of (R,S...
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- Published 13 Mar 2018
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Scheme 1: Bidentate bisborane Lewis acids.
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Scheme 2: Complexation reaction of 5,10-dimethyl-5,10-dihydroboranthrene (A) with Lewis bases analyzed by NMR...
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Figure 1: Time-dependent 1H NMR spectra of the air-exposed complex B.
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Scheme 3: Synthetic procedures of bisboranes A and B.
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Figure 2: ORTEP drawing (50% probability) of complex B.
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Figure 3: UV–vis spectrum of complex B was measured in CHCl3 and compared with pyridazine and bisborane A (co...
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- Published 13 Jun 2012
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Figure 1: para-Substituted bisazobiphenyls 1 investigated by Hecht (R1, R2 = H, Me, R3 = t-Bu) and by Woolley...
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Figure 2: Synthetic strategy for the assembly of meta-substituted oligo-azobiphenyls 2.
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Scheme 1: Synthesis of 2-nitro-4-tert-butyl-6-bromobenzoic acid (6).
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Scheme 2: Preparation of nitroso derivative 10.
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Scheme 3: Assembly of oligomer 2 by Suzuki cross-coupling and site-selective Mills reaction.
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Figure 3: Isomerization studies of compound 13 (a), 15 (b), 16 (c) and 2 (d) (Irradiation at 356 nm in CHCl3)....
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Figure 4: Comparison of the absorption as well as the photostationary state of compounds 13, 15, 16, 2.
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Figure 5: Four different isomers of 2.
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