An enantiomerically pure siderophore type ligand for the diastereoselective 1 : 1 complexation of lanthanide(III) ions

• Markus Albrecht,
• Olga Osetska,
• Thomas Abel,
• Gebhard Haberhauer and
• Eva Ziegler

Beilstein J. Org. Chem. 2009, 5, No. 78, doi:10.3762/bjoc.5.78

• lanthanide(III) ions is of interest, due to the special properties of those compounds as light emitting or magnetic materials [39]. Experimental NMR spectra were recorded on a Varian Mercury 300 NMR spectrometer. FT-IR spectra were measured on a PerkinElmer Spektrum 100 spectrometer. Mass spectra were taken

An expedient and new synthesis of pyrrolo[1,2-b]pyridazine derivatives

• Rajeshwar Reddy Sagyam,
• Ravinder Buchikonda,
• Jaya Prakash Pitta,
• Himabindu Vurimidi,
• Pratap Reddy Padi and
• Mahesh Reddy Ghanta

Beilstein J. Org. Chem. 2009, 5, No. 66, doi:10.3762/bjoc.5.66

• blocks for various products with pyrrolo[1,2-b]pyridazine cores. Experimental The 1H, 13C NMR spectra were recorded in DMSO-d6 and CDCl3 at 200 or 400 MHz on a Mercury Plus/Varian Gemini 2000 FT NMR spectrometer. Proton chemical shifts (δ) were expressed in ppm with tetramethylsilane (TMS, δ 0.00) as

Synthesis and properties of calix[4]arene telluropodant ethers as Ag⁺ selective sensors and Ag⁺, Hg²⁺ extractants

• Yang Lu,
• Yuanyuan Li,
• Song He,
• Yan Lu,
• Changying Liu,
• Xianshun Zeng and
• Langxing Chen

Beilstein J. Org. Chem. 2009, 5, No. 59, doi:10.3762/bjoc.5.59

• +-selective ionophores in ion-selective electrodes evaluated by electromotive force measurements of polymer membrane electrodes. The tweezer-like ionophores 6–8 showed excellent extraction ability towards Ag+ and Hg2+. Keywords: calix[4]arenes; extractants; mercury; sensors; silver; telluropodant ether

Structural studies on encapsulation of tetrahedral and octahedral anions by a protonated octaaminocryptand cage

• I. Ravikumar,
• P. S. Lakshminarayanan,
• E. Suresh and
• Pradyut Ghosh

Beilstein J. Org. Chem. 2009, 5, No. 41, doi:10.3762/bjoc.5.41

• are shown for clarity). (a) Mercury diagram depicting the interactions of the encapsulated ClO4− within the [H6L1]6+ and the surrounding water molecules. (b) Mercury diagram depicting the interactions of the encapsulated ClO4− within the hexaprotonated tere-cryptand moiety and the surrounding water

• for the thermal ellipsoids and only hydrogen atoms attached to the amino nitrogens are shown in the figure for clarity). Mercury diagram depicting the encapsulation of disordered hydrogen sulfate in the cavity of [H8L1]8+ through various hydrogen bonding interactions. Interactions of the protonated

• hydrogen atoms attached to the amino nitrogens are shown for clarity). Mercury diagram depicting the encapsulation of the disordered HSiF6− inside the [H8L1]8+ moiety along with various hydrogen bonding interactions. Only hydrogen atoms having interactions with encapsulated anion are shown for clarity

Reversible intramolecular photocycloaddition of a bis(9-anthrylbutadienyl)paracyclophane – an inverse photochromic system. (Photoactive cyclophanes 5)

• Henning Hopf,
• Christian Beck,
• Jean-Pierre Desvergne,
• Henri Bouas-Laurent,
• Peter G. Jones and
• Ludger Ernst

Beilstein J. Org. Chem. 2009, 5, No. 20, doi:10.3762/bjoc.5.20

• CH2Cl2 through which nitrogen was bubbled with a medium pressure mercury lamp in a Pyrex photoreactor (UV light filtered by NaNO2 aqueous solution) gave 4 as a white powder after a week at −20 °C. That a single photoproduct was produced is borne out by HPLC, showing the increase of a single peak at the

• , was irradiated at λ > 400 nm for 2 h with a high pressure mercury lamp in a Pyrex photoreactor. The cooling tube of the latter was filled with a NaNO2 solution (75 g/L) maintaining the reaction medium at 10–20 °C. After the end of irradiation, the solution was concentrated at ca 15 °C to 10 mL; then

A biphasic oxidation of alcohols to aldehydes and ketones using a simplified packed- bed microreactor

• Andrew Bogdan and
• D. Tyler McQuade

Beilstein J. Org. Chem. 2009, 5, No. 17, doi:10.3762/bjoc.5.17

• purchased from Aldrich and titrated before use. 1H NMR and 13C NMR spectra were recorded in CDCl3 on Varian Mercury 300 MHz operating at 300.070 MHz and 75.452 MHz, respectively, using the residual solvent peak as reference. ATR-IR was performed on a Nicolet Avatar DTGS 370 infrared spectrometer with Avatar

Synthesis of 3-(phenylazo)-1,2,4-triazoles by a nucleophilic reaction of primary amines with 5-chloro- 2,3-diphenyltetrazolium salt via mesoionic 2,3-diphenyltetrazolium- 5-aminides

• Shuki Araki,
• Satoshi Hirose,
• Yoshikazu Konishi,
• Masatoshi Nogura and
• Tsunehisa Hirashita

Beilstein J. Org. Chem. 2009, 5, No. 8, doi:10.3762/bjoc.5.8

• spectra were obtained using a Varian Mercury 200 (200 MHz) or a Varian Mercury 300 (300 MHz), and 13C NMR spectra were obtained using a Varian Mercury 200 (50 MHz). Chemical shifts are recorded in ppm downfield from tetramethylsilane. J values are given in Hz. Mass spectra were taken with a Hitachi M-2000

A facile synthesis and fungicidal activities of 2-(alkylamino)-5,6-dimethylthieno[2,3-d]pyrimidin- 4(3H)-ones

• Yang-Gen Hu,
• Ai-Hua Zheng,
• Xu-Zhi Ruan and
• Ming-Wu Ding

Beilstein J. Org. Chem. 2008, 4, No. 49, doi:10.3762/bjoc.4.49

• relationships of the title compounds are underway. Experimental Melting points were uncorrected. MS were measured on a Finnigan Trace MS spectrometer. IR were recorded on a PE-983 infrared spectrometer as KBr pellets with absorption in cm−1. 1H NMR spectra were recorded in CDCl3 on a Varian Mercury 400

End game strategies towards the total synthesis of vibsanin E, 3-hydroxyvibsanin E, furanovibsanin A, and 3-O-methylfuranovibsanin A

• Brett D. Schwartz,
• Craig M. Williams and
• Paul V. Bernhardt

Beilstein J. Org. Chem. 2008, 4, No. 34, doi:10.3762/bjoc.4.34

• methylated furans using catalytic amounts of mercury triflate. Although verification of this protocol was undertaken on a cycloheptanone derivative, substrate 39 failed to give the desired furan 42 (Scheme 6). Instead, hydration was observed as the major reaction pathway (i.e. 40) with furan 41 being

The enantiospecific synthesis of (+)-monomorine I using a 5-endo- trig cyclisation strategy

• Malcolm B. Berry,
• Donald Craig,
• Philip S. Jones and
• Gareth J. Rowlands

Beilstein J. Org. Chem. 2007, 3, No. 39, doi:10.1186/1860-5397-3-39

• -Hydride® to give the free amines 23 and 15c, which were subjected to mercury-mediated hydroamination (Scheme 6 and Scheme 7). [20] Cyclisation of 23 proceeded in good yield to give a 9:4 mixture of two indolizidines, epimeric at the C-5 methyl group 24-anti and 24-syn (Scheme 6). Cyclisation of the

• required for the preparation of (+)-monomorine I Mercury-mediated hydroamination Proposed transition state for mercury-mediate hydroamination Model study for the reductive amination-based cyclisation The synthesis of (+)-monomorine I Deprotection of N-benzoylpyrrolidines Supporting Information Supporting

Solvent- controlled regioselective protection of allyl- 4,6-benzylidene glucopyranosides

• Kerry Ann Ness and
• Marie E. Migaud

Beilstein J. Org. Chem. 2007, 3, No. 26, doi:10.1186/1860-5397-3-26

• acidity of the alcohol groups. The steric and electronic effect of the anomeric substituents was then assessed by examining the β-allyl glucoside anomer (Table 3). The allyl-4,6-O-benzylidene-β-D-glucopyranoside, 11 was synthesised from 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide using mercury

• bromide, mercury oxide and allyl alcohol. Only dialkylated material 14 was obtained under both sets of alkylation conditions. To examine the impact of the nature of the glycon, benzylation of methyl and benzyl 4,6-benzylidene-α-D-glucosides, 15 and 16 respectively, was also carried out (Table 4). The

Photosonochemical catalytic ring opening of α-epoxyketones

• Hamid R. Memarian and
• Ali Saffar-Teluri

Beilstein J. Org. Chem. 2007, 3, No. 2, doi:10.1186/1860-5397-3-2

• were performed using a 400 W high pressure mercury lamp from Narva with cooling of samples in Duran glass. 1H NMR spectra of the mixture of photoproducts were measured in CDCl3 solutions containing tetramethylsilane (TMS) as internal standard on a Bruker drx-500 (500 MHz). Preparative layer