Influence of cyclodextrin on the solubility of a classically prepared 2-vinylcyclopropane macromonomer in aqueous solution

• Helmut Ritter,
• Jia Cheng and
• Monir Tabatabai

Beilstein J. Org. Chem. 2012, 8, 1528–1535, doi:10.3762/bjoc.8.173

• (4) was synthesized following a procedure described in [32]. Diethyl 2-vinyl-1,1-cyclopropanedicarboxylate could be obtained according to [33] from sodium ethoxide, diethyl malonate and trans-1,4-dichloro-2-butene in ethanol (Scheme 2). The desired macromonomer 5 was prepared in two steps according

Sexithiophenes as efficient luminescence quenchers of quantum dots

• Christopher R. Mason,
• Yang Li,
• Paul O’Brien,
• Neil J. Findlay and
• Peter J. Skabara

Beilstein J. Org. Chem. 2011, 7, 1722–1731, doi:10.3762/bjoc.7.202

• = 4.4, 2H); MS (EI) m/z: 338 (M+, 51%), 310 (19%), 265 (19%); MS (CI) m/z: 356 (M + NH4+, 5%), 339 (M + H+, 100%). 5,7-Dithiophen-2-yl-2,3-dihydrothieno[3,4-b][1,4]dithiine (5) [30] To a solution of the terthiophene D (2.17 g, 6.4 mmol) in dry tetrahydrofuran (150 mL), was added sodium ethoxide (0.2 M

Approaches towards the synthesis of 5-aminopyrazoles

• Ranjana Aggarwal,
• Vinod Kumar,
• Rajiv Kumar and
• Shiv P. Singh

Beilstein J. Org. Chem. 2011, 7, 179–197, doi:10.3762/bjoc.7.25

• intermediacy of the acyclic cyano derivative 127 (Scheme 34) [76]. Hydrazonoyl chlorides 129 on treatment with benzothiazole-2-acetonitrile in ethanolic sodium ethoxide solution at room temperature afforded intermediate hydrazones 130 which on cyclization gave products identified as 3-substituted 5-amino-1

• sodium ethoxide (Scheme 47). Ioannidou and Koutentis [91] investigated the conversion of isothiazoles into pyrazoles on treatment with hydrazine. The influence of various C-3, C-4 and C-5 isothiazole substituents and some limitations of this ring transformation were investigated. When a good nucleofugal

Redox-active tetrathiafulvalene and dithiolene compounds derived from allylic 1,4-diol rearrangement products of disubstituted 1,3-dithiole derivatives

• Filipe Vilela,
• Peter J. Skabara,
• Christopher R. Mason,
• Thomas D. J. Westgate,
• Asun Luquin,
• Simon J. Coles and
• Michael B. Hursthouse

Beilstein J. Org. Chem. 2010, 6, 1002–1014, doi:10.3762/bjoc.6.113

• solution of 8-(2-thienyl)thieno[2,3-f][1,3]benzodithiole-2-thione 3 (0.092 g, 2.85 × 10−4 mol) in dry THF (10 ml) under a nitrogen atmosphere, was added sodium ethoxide (0.1 M aqueous solution, 2.85 ml, 2.85 × 10−4 mol) and the mixture heated under reflux for 1 h. Tetrabutylammonium bromide (0.097 g, 3.01

Synthesis of 3-(quinolin-2-yl)- and 3,6-bis(quinolin-2-yl)-9H-carbazoles

• Yang Li and
• Wentao Gao

Beilstein J. Org. Chem. 2010, 6, 966–972, doi:10.3762/bjoc.6.108

• Yang Li Wentao Gao Institute of Superfine Chemicals, Bohai University, Jinzhou 121000, China 10.3762/bjoc.6.108 Abstract A simple and efficient synthesis of novel 3-(quinolin-2-yl)- and 3,6-bis(quinolin-2-yl)-9H-carbazoles, utilizing sodium ethoxide as a catalyst via a Friedländer condensation

• : acetylcarbazole; β-aminoaldehyde; β-aminoketone; Friedländer condensation; sodium ethoxide; Introduction Nitrogen-containing heterocycles are a very important group of organic compounds because of their wide application in medicine, agriculture, and technology. Among these, quinoline and carbazole derivatives

• quinolines under mild conditions catalysed by sodium ethoxide. In connection with our studies, we envisioned that the procedure could also be applied to the reaction of 3-acetyl-9-ethyl-9H-carbazole or 3,6-diacetyl-9-ethyl-9H-carbazole with 2-aminoaldehydes or 2-aminoketones, from which the quinolycarbazoles

9,10-Dioxa-1,2-diaza-anthracene derivatives from tetrafluoropyridazine

• Graham Pattison,
• Graham Sandford,
• Dmitrii S. Yufit,
• Judith A. K. Howard,
• John A. Christopher and
• David D. Miller

Beilstein J. Org. Chem. 2010, 6, No. 45, doi:10.3762/bjoc.6.45

• substitution ring annelation process, further extending the use of perfluoroheteroaromatic derivatives for the synthesis of unusual polyfunctional heterocyclic architectures. The tricyclic scaffold reacts with amines and sodium ethoxide providing a short series of functional 9,10-dioxa-1,2-diaza-anthracene

• publication CCDC-764716. Reaction of 3,4-difluoro-9,10-dioxa-1,2-diaza-anthracene (5) with sodium ethoxide 4-Ethoxy-3-fluoro-9,10-dioxa-1,2-diaza-anthracene (9c) Using the procedure described above, 3,4-difluoro-9,10-dioxa-1,2-diaza-anthracene (5) (0.10 g, 0.45 mmol), sodium ethoxide (0.06 g, 0.90 mmol) and

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

• condensation reactions, such as the condensation of oxazolo[3,2-b]pyridazinium perchlorates with malononitrile, ethyl cyanoacetate and ethyl malonate in the presence of sodium ethoxide [15]; the condensation of 1,4,7-triketones with hydrazine followed by dehydrogenation [16]; the condensation of cyanoacetic

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

• carbodiimides 4, which were allowed to react with secondary amines to provide guanidine intermediates 5. Even in refluxing toluene, compounds 5 did not cyclize. However, in the presence of a catalytic amount of sodium ethoxide, compounds 5 were converted easily to 2-(dialkylamino)-5,6-dimethylthieno[2,3-d