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Search for "controllable" in Full Text gives 54 result(s) in Beilstein Journal of Organic Chemistry.

Complexation of 2,6-helic[6]arene and its derivatives with 1,1′-dimethyl-4,4′-bipyridinium salts and protonated 4,4'-bipyridinium salts: an acid–base controllable complexation

  • Jing Li,
  • Qiang Shi,
  • Ying Han and
  • Chuan-Feng Chen

Beilstein J. Org. Chem. 2019, 15, 1795–1804, doi:10.3762/bjoc.15.173

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  • the guests and in less polar solvent. Furthermore, the controllable complexation between (O-methyl)6-2,6-helic[6]arene and protonated 4,4'-bipyridinium salt could be efficiently controlled by acids and bases. Results and Discussion Synthesis of the hosts and the guests 2,6-Helic[6]arene H1 and its
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Published 26 Jul 2019

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

Graphical Abstract
  • chemistry. Here, we present the synthesis of a foldable container consisting of two different types of Lissoclinum macrocyclic peptides which are connected via two azobenzene units. The container is controllable by light: irradiation with UV light causes a switching process to the compact cis,cis-isomer
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Published 10 Jul 2019

Fabrication, characterization and adsorption properties of cucurbit[7]uril-functionalized polycaprolactone electrospun nanofibrous membranes

  • Changzhong Chen,
  • Fengbo Liu,
  • Xiongzhi Zhang,
  • Zhiyong Zhao and
  • Simin Liu

Beilstein J. Org. Chem. 2019, 15, 992–999, doi:10.3762/bjoc.15.97

Graphical Abstract
  • or some low-molecular weight organic compounds [1][2][3][4][5]. With the unique advantages of ultrafine diameter, high specific surface area, controllable morphology, and easy functionalization, electrospun nanofibers have potential applications in various areas including drug delivery and tissue
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Letter
Published 29 Apr 2019

Azologization of serotonin 5-HT3 receptor antagonists

  • Karin Rustler,
  • Galyna Maleeva,
  • Piotr Bregestovski and
  • Burkhard König

Beilstein J. Org. Chem. 2019, 15, 780–788, doi:10.3762/bjoc.15.74

Graphical Abstract
  • amide bond (Scheme 1) by an azo bridge would result in highly active photochromic serotonin 5-HTR antagonists controllable by irradiation with light. Based on the suggested receptor binding mode reported for one potent non-photochromic antagonist (lead structure of 16c) [61] we expected the extended
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Published 25 Mar 2019

LCST phase behavior of benzo-21-crown-7 with different alkyl chains

  • Yan Deng,
  • Xing Li,
  • Qiao Zhang,
  • Zheng Luo,
  • Chengyou Han and
  • Shengyi Dong

Beilstein J. Org. Chem. 2019, 15, 437–444, doi:10.3762/bjoc.15.38

Graphical Abstract
  • behavior, is a type of thermo-responsiveness [14][15][16], which has gained much attention in supramolecular chemistry, because of its profound impact on the development of stimuli-sensitive supramolecular materials with controllable and/or programmable phase separation properties [17][18][19]. Though LCST
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Letter
Published 14 Feb 2019

Olefin metathesis in multiblock copolymer synthesis

  • Maria L. Gringolts,
  • Yulia I. Denisova,
  • Eugene Sh. Finkelshtein and
  • Yaroslav V. Kudryavtsev

Beilstein J. Org. Chem. 2019, 15, 218–235, doi:10.3762/bjoc.15.21

Graphical Abstract
  • the MCM conditions enables one to obtain copolymers with a controllable average block length ranging from the initial homopolymer length to a few monomer units. Important data on the kinetics of MCM between PNB and PCOE mediated by Gr1 were obtained by combining in situ NMR studies of the Ru-carbene
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Published 24 Jan 2019

A convenient and practical synthesis of β-diketones bearing linear perfluorinated alkyl groups and a 2-thienyl moiety

  • Ilya V. Taydakov,
  • Yuliya M. Kreshchenova and
  • Ekaterina P. Dolotova

Beilstein J. Org. Chem. 2018, 14, 3106–3111, doi:10.3762/bjoc.14.290

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  • autocatalytic nature of the reaction. Since the alkoxide that is formed during the reaction acts as a catalyst [30], addition of small amounts (200–500 μL) of anhydrous EtOH (in a reaction using 100 mmol of compounds) to the initial NaH suspension in THF makes the reaction fully controllable. As it was
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Published 27 Dec 2018

A self-assembled photoresponsive gel consisting of chiral nanofibers

  • Lei Zou,
  • Dan Han,
  • Zhiyi Yuan,
  • Dongdong Chang and
  • Xiang Ma

Beilstein J. Org. Chem. 2018, 14, 1994–2001, doi:10.3762/bjoc.14.174

Graphical Abstract
  • and co-workers [20][21][22][23][24][25][26][27][28][29][30][31] have built a multifunctional controllable gel system, which utilized L-glutamic lipid to construct nanofibers, nanotwists, and nanotubes with the property of chirality. Azobenzene, which is structurally photosensitive, is widely chosen to
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Published 01 Aug 2018

A conformationally adaptive macrocycle: conformational complexity and host–guest chemistry of zorb[4]arene

  • Liu-Pan Yang,
  • Song-Bo Lu,
  • Arto Valkonen,
  • Fangfang Pan,
  • Kari Rissanen and
  • Wei Jiang

Beilstein J. Org. Chem. 2018, 14, 1570–1577, doi:10.3762/bjoc.14.134

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  • , Wuhan, 430079, China 10.3762/bjoc.14.134 Abstract Large amplitude conformational change is one of the features of biomolecular recognition and is also the basis for allosteric effects and signal transduction in functional biological systems. However, synthetic receptors with controllable conformational
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Published 27 Jun 2018

Selective carboxylation of reactive benzylic C–H bonds by a hypervalent iodine(III)/inorganic bromide oxidation system

  • Toshifumi Dohi,
  • Shohei Ueda,
  • Kosuke Iwasaki,
  • Yusuke Tsunoda,
  • Koji Morimoto and
  • Yasuyuki Kita

Beilstein J. Org. Chem. 2018, 14, 1087–1094, doi:10.3762/bjoc.14.94

Graphical Abstract
  • replacement for certain heavy-metal oxidizers, such as lead, mercury, and thallium-based salts, due to their low toxicities, high stabilities, operational simplicities, and many other user-friendly characteristics [31][32]. By virtue of their wide array of reactivity patterns, the controllable radical and
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Published 16 May 2018

Photocatalytic formation of carbon–sulfur bonds

  • Alexander Wimmer and
  • Burkhard König

Beilstein J. Org. Chem. 2018, 14, 54–83, doi:10.3762/bjoc.14.4

Graphical Abstract
  • the corresponding sulfides. Very recently, the same group reported of a controllable sulfenylation and sulfoxidation procedure starting from alkyl and aryl thiosulfates and diaryliodonium salts under visible-light catalysis with Eosin Y (Scheme 40) [75]. They observed that the reaction yields the
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Published 05 Jan 2018

Homologated amino acids with three vicinal fluorines positioned along the backbone: development of a stereoselective synthesis

  • Raju Cheerlavancha,
  • Ahmed Ahmed,
  • Yun Cheuk Leung,
  • Aggie Lawer,
  • Qing-Quan Liu,
  • Marina Cagnes,
  • Hee-Chan Jang,
  • Xiang-Guo Hu and
  • Luke Hunter

Beilstein J. Org. Chem. 2017, 13, 2316–2325, doi:10.3762/bjoc.13.228

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  • University, Nanchang, China School of Chemistry, The University of Sydney, Sydney NSW 2006, Australia 10.3762/bjoc.13.228 Abstract Backbone-extended amino acids have a variety of potential applications in peptide and protein science, particularly if the geometry of the amino acid is controllable. Here we
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Published 01 Nov 2017

Conjugated nitrosoalkenes as Michael acceptors in carbon–carbon bond forming reactions: a review and perspective

  • Yaroslav D. Boyko,
  • Valentin S. Dorokhov,
  • Alexey Yu. Sukhorukov and
  • Sema L. Ioffe

Beilstein J. Org. Chem. 2017, 13, 2214–2234, doi:10.3762/bjoc.13.220

Graphical Abstract
  • nitrosoalkene generation employs their stable nitrosoacetals of type 3 (N,N-bis(silyloxy)enamines) [17][18]. The latter eliminate (Alk3Si)2O upon the action of Lewis bases generating the corresponding nitrosoalkenes at low stationary concentrations in a controllable manner. Furthermore, synthetic precursors of
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Published 23 Oct 2017

Block copolymers from ionic liquids for the preparation of thin carbonaceous shells

  • Sadaf Hanif,
  • Bernd Oschmann,
  • Dmitri Spetter,
  • Muhammad Nawaz Tahir,
  • Wolfgang Tremel and
  • Rudolf Zentel

Beilstein J. Org. Chem. 2017, 13, 1693–1701, doi:10.3762/bjoc.13.163

Graphical Abstract
  • elugrams are shown in Figure 2 and Figure S4 (Supporting Information File 1). The polymers described in our work have a narrow polydispersity index (PDI) varying from 1.11 (for the PIL block) up to 1.23 for the block copolymer. In order to show how controllable the polymerization of IL by RAFT
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Published 16 Aug 2017

Synthesis and metal binding properties of N-alkylcarboxyspiropyrans

  • Alexis Perry and
  • Christina J. Kousseff

Beilstein J. Org. Chem. 2017, 13, 1542–1550, doi:10.3762/bjoc.13.154

Graphical Abstract
  • ., C4SP, Scheme 1) which exist in photo-controlled equilibrium with their zwitterionic, fully-conjugated merocyanine isomer [1] (e.g., C4MC, Scheme 1). The controllable nature of this isomerisation and the dramatic differences in physical and chemical properties displayed by the isomeric forms, coupled
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Published 04 Aug 2017

Synthesis and optical properties of new 5'-aryl-substituted 2,5-bis(3-decyl-2,2'-bithiophen-5-yl)-1,3,4-oxadiazoles

  • Anastasia S. Kostyuchenko,
  • Tatyana Yu. Zheleznova,
  • Anton J. Stasyuk,
  • Aleksandra Kurowska,
  • Wojciech Domagala,
  • Adam Pron and
  • Alexander S. Fisyuk

Beilstein J. Org. Chem. 2017, 13, 313–322, doi:10.3762/bjoc.13.34

Graphical Abstract
  • , solution-processable and conjugated compounds can be modified in a controllable way by the nature of the electron-accepting heterocyclic ring, the position of the solubilizing alkyl substituent and the molecule topology (linear vs three-arms star) [16][19][21][23]. In particular, the synthesized molecules
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Published 17 Feb 2017

Construction of bis-, tris- and tetrahydrazones by addition of azoalkenes to amines and ammonia

  • Artem N. Semakin,
  • Aleksandr O. Kokuev,
  • Yulia V. Nelyubina,
  • Alexey Yu. Sukhorukov,
  • Petr A. Zhmurov,
  • Sema L. Ioffe and
  • Vladimir A. Tartakovsky

Beilstein J. Org. Chem. 2016, 12, 2471–2477, doi:10.3762/bjoc.12.241

Graphical Abstract
  • ][6][7][8][9][10][11][12][13][14][15][16][17]. The hydrazone group is a chemically stable, easily assembled motif with prospective coordination properties, which can be tuned by substitution at the carbon and nitrogen atoms. Furthermore, a reversible E/Z-isomerism of the C=N bond allows controllable
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Published 21 Nov 2016

Thermal and oxidative stability of Atlantic salmon oil (Salmo salar L.) and complexation with β-cyclodextrin

  • Daniel I. Hădărugă,
  • Mustafa Ünlüsayin,
  • Alexandra T. Gruia,
  • Cristina Birău (Mitroi),
  • Gerlinde Rusu and
  • Nicoleta G. Hădărugă

Beilstein J. Org. Chem. 2016, 12, 179–191, doi:10.3762/bjoc.12.20

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  • . The advantages of this chemical method in comparison with other classical methods (e.g., oven drying or similar drying methods) is related to the selectivity for water (no other compounds such as solvents or volatiles will be detected), the controllable analysis temperature (room temperature or a
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Published 02 Feb 2016

Bright molecules for sensing, computing and imaging: a tale of two once-troubled cities

  • A. Prasanna de Silva

Beilstein J. Org. Chem. 2015, 11, 2774–2784, doi:10.3762/bjoc.11.298

Graphical Abstract
  • identification (MCID) tags come to the rescue [67][68]. Fluorescence colour is a useful identifier [69] but sufficient diversity is not generated in this way. Substantial diversities are created when the emission of the fluorescence colour is made conditional upon various controllable input parameters, such as
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Published 29 Dec 2015

Hexacoordinate Ru-based olefin metathesis catalysts with pH-responsive N-heterocyclic carbene (NHC) and N-donor ligands for ROMP reactions in non-aqueous, aqueous and emulsion conditions

  • Shawna L. Balof,
  • K. Owen Nix,
  • Matthew S. Olliff,
  • Sarah E. Roessler,
  • Arpita Saha,
  • Kevin B. Müller,
  • Ulrich Behrens,
  • Edward J. Valente and
  • Hans-Jörg Schanz

Beilstein J. Org. Chem. 2015, 11, 1960–1972, doi:10.3762/bjoc.11.212

Graphical Abstract
  • particles is somewhat controllable. It should be noted that DCPD contains two reactive double bonds in the monomer structure. When both undergo metathesis in a ROMP reaction, particularly at elevated temperatures, then the PDCPD material is crosslinked [70]. With respect to the latexes synthesized in this
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Published 21 Oct 2015

Regulation of integrin and growth factor signaling in biomaterials for osteodifferentiation

  • Qiang Wei,
  • Theresa L. M. Pohl,
  • Anja Seckinger,
  • Joachim P. Spatz and
  • Elisabetta A. Cavalcanti-Adam

Beilstein J. Org. Chem. 2015, 11, 773–783, doi:10.3762/bjoc.11.87

Graphical Abstract
  • the advantage of controlled and sustained influence on cell behavior [82][83], however, the orientation of many growth factors in single molecule level is not well controllable, which decreases the activity of the immobilized factors. In addition, immobilizing osteoinductive proteins on preferably
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Published 13 May 2015

Multivalent dendritic polyglycerolamine with arginine and histidine end groups for efficient siRNA transfection

  • Fatemeh Sheikhi Mehrabadi,
  • Hanxiang Zeng,
  • Mark Johnson,
  • Cathleen Schlesener,
  • Zhibin Guan and
  • Rainer Haag

Beilstein J. Org. Chem. 2015, 11, 763–772, doi:10.3762/bjoc.11.86

Graphical Abstract
  • with low dispersity. Moreover, the tree-like structure of such polymers provides multivalent positions for functionalization and interaction with DNA/siRNA. Dendritic polyglycerol (dPG) can be synthesized on a kilogram scale by a one-step, ring-opening polymerization of glycidol with controllable sizes
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Published 13 May 2015

Selective methylation of kaempferol via benzylation and deacetylation of kaempferol acetates

  • Qinggang Mei,
  • Chun Wang,
  • Weicheng Yuan and
  • Guolin Zhang

Beilstein J. Org. Chem. 2015, 11, 288–293, doi:10.3762/bjoc.11.33

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  • /bjoc.11.33 Abstract A strategy for selective mono-, di- and tri-O-methylation of kaempferol, predominantly on the basis of selective benzylation and controllable deacetylation of kaempferol acetates, was developed. From the selective deacetylation and benzylation of kaempferol tetraacetate (1), 3,4′,5
  • ,-tri-O-acetylkaempferol (2) and 7-O-benzyl-3,4′5,-tri-O-acetylkaempferol (8) were obtained, respectively. By controllable deacetylation and followed selective or direct methylation of these two intermediates, eight O-methylated kaempferols were prepared with 51–77% total yields from kaempferol
  • or controllable hydrolysis of kaempferol tetraacetate (1) intending to get the specific hydroxy group free for methylation. The solubility of acetylated kaempferols is improved, and the conditions for the methylation possess more possibilities. As a part of our ongoing work on the synthesis and
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Published 25 Feb 2015

Superstructures with cyclodextrins: Chemistry and applications II

  • Gerhard Wenz

Beilstein J. Org. Chem. 2015, 11, 271–272, doi:10.3762/bjoc.11.30

Graphical Abstract
  • polyrotaxanes [5][6][7]. The solubility and stability of CD complexes are controllable through the derivatization of CDs. Remarkable progress has been achieved over the past 10 years regarding the regioselective derivatization of cyclodextrins. Synthetic procedures for CD key derivatives such as mono-6-O-tosyl
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Editorial
Published 18 Feb 2015

Release of β-galactosidase from poloxamine/α-cyclodextrin hydrogels

  • César A. Estévez,
  • José Ramón Isasi,
  • Eneko Larrañeta and
  • Itziar Vélaz

Beilstein J. Org. Chem. 2014, 10, 3127–3135, doi:10.3762/bjoc.10.330

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  • absorbing considerable amounts of water, and are suitable for a variety of pharmaceutical and biomedical applications, such as drug delivery and tissue engineering. In particular, hydrogels are excellent vehicles for proteins due to their high water content, good compatibility, and controllable release
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Published 24 Dec 2014
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