Royal Society of Chemistry

Iron-catalyzed radical aryldifluoromethylation of activated alkenes to difluoromethylated oxindoles

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5582-5585
DOI: 10.1039/C4OB00758A, CommunicationJian-Yong Wang, Xin Zhang, Yan Bao, Yue-Ming Xu, Xiu-Fen Cheng, Xi-Sheng Wang
An iron-catalyzed aryldifluoromethylation of activated alkenes has been developed, which is a rare example where a cosolvent is used to improve the yield along with Fenton's reagent.
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Palladium-catalyzed microwave-assisted direct arylation of imidazo[2,1-b]thiazoles with aryl bromides: synthesis and mechanistic study

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5773-5780
DOI: 10.1039/C4OB00600C, PaperYi-Shuo Zhu, Benyi Shi, Ran Fang, Xiaoxuan Wang, Huanwang Jing
A palladium-catalyzed regioselective C-H arylation of imidazo[2,1-b]thiazoles under microwave irradiation via a concerted metalation-deprotonation (CMD) pathway was developed.
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Elucidating factors leading to acidolytic degradation of sterically strained oligoether dendrons

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5621-5628
DOI: 10.1039/C4OB00540F, PaperJ. Karabline-Kuks, A. Fallek, M. Portnoy
Monitoring of the disassembly of third-generation sterically crowded oligoether dendrons in acidic solution reveals their exact degradation sequence, synergistically induced by electron donation and steric strain.
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Synthesis of functionalized chromones through sequential reactions in aqueous media

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5757-5765
DOI: 10.1039/C4OB00618F, PaperSaber Mehrparvar, Saeed Balalaie, Mahnaz Rabbanizadeh, Frank Rominger, Elmira Ghabraie
An efficient synthesis protocol has been developed for diversity-oriented functionalized compounds via four-component reaction of chromone carbaldehydes, Meldrum's acid, 4-hydroxyl coumarin or 6-methyl-4-hydroxyl-pyrone and primary alcohols in aqueous media.
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Pd(OAc)2/DABCO as an efficient and phosphine-free catalytic system for the synthesis of single and double Weinreb amides by the aminocarbonylation of aryl iodides

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5727-5732
DOI: 10.1039/C4OB00729H, PaperSandip T. Gadge, Bhalchandra M. Bhanage
Single and double Weinreb amides were synthesized using a Pd(OAc)2 catalyst and DABCO as an inexpensive and stable ligand using carbonylation methodology under phosphine-free conditions.
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Electrophilicity and nucleophilicity of commonly used aldehydes

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5781-5788
DOI: 10.1039/C4OB00555D, PaperSanjay Pratihar
The present approach for determining the electrophilicity (E) and nucleophilicity (N) of aldehydes includes a kinetic study of KMNO4 oxidation and NaBH4 reduction of aldehydes.
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Hydroxyl radical induced oxidation of theophylline in water: a kinetic and mechanistic study

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5611-5620
DOI: 10.1039/C4OB00102H, PaperM. M. Sunil Paul, U. K. Aravind, G. Pramod, A. Saha, C. T. Aravindakumar
Evidence is reported for the addition and hydrogen abstraction reactions of hydroxyl radicals with an important pharmaceutically active compound, theophylline.
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Efficient palladium-catalyzed double carbonylation of o-dibromobenzenes: synthesis of thalidomide

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5578-5581
DOI: 10.1039/C4OB00796D, CommunicationJianbin Chen, Kishore Natte, Anke Spannenberg, Helfried Neumann, Matthias Beller, Xiao-Feng Wu
A convenient and mild procedure for double carbonylation of o-dibromobenzene with various 2-amino pyridines and naturally occurring amines has been developed. N-Substituted phthalimides were produced in good to excellent yields. Furthermore, thalidomide was produced in excellent yield under these conditions.
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Bis-chlorination of a hexapeptide-PCP conjugate by the halogenase involved in vancomycin biosynthesis

Org. and Biomol. Chem. - 15 July, 2014 - 06:54

Org. Biomol. Chem., 2014, 12,5574-5577
DOI: 10.1039/C4OB00474D, CommunicationOpen Access Open Access Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.Patrick C. Schmartz, Katja Zerbe, Khaled Abou-Hadeed, John A. Robinson
The vancomycin biosynthetic halogenase can bis-chlorinate both [small beta]-hydroxytyrosine residues-2 and -6 in a model substrate comprising a PCP-linked hexapeptide.
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Self-assembled capsules based on tetrafunctionalized calix[4]resorcinarene cavitands

Chem. Soc. Rev. - 15 July, 2014 - 06:54

Chem. Soc. Rev., 2014, Advance Article
DOI: 10.1039/C4CS00153B, Review ArticleKenji Kobayashi, Masamichi Yamanaka
The hemispherical structures of calix[4]resorcinarene cavitands are suitable for forming capsular assemblies with guest encapsulations through various intermolecular interactions.
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Recycling of carbon dioxide to methanol and derived products - closing the loop

Chem. Soc. Rev. - 15 July, 2014 - 06:54

Chem. Soc. Rev., 2014, Advance Article
DOI: 10.1039/C4CS00122B, Review ArticleAlain Goeppert, Miklos Czaun, John-Paul Jones, G. K. Surya Prakash, George A. Olah
Possible pathways to recycle CO2 to methanol, dimethyl ether and derived products in a sustainable anthropogenic carbon cycle are discussed.
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Programmed stereoselective assembly of DNA-binding helical metallopeptides

Chem. Commun. - 14 July, 2014 - 12:17

Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC03606A, CommunicationIlaria Gamba, Gustavo Rama, Elizabeth Ortega-Carrasco, Jean-Didier Marechal, Jose Martinez-Costas, M. Eugenio Vazquez, Miguel Vazquez Lopez
We have applied solid phase peptide synthesis methods for the construction of peptide ligands that coordinate Fe(II) ions and fold into chiral peptide helicates that show great affinity and chiral selectivity for three-way DNA junctions and promising cell-internalization properties.
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Mechanosynthesis of imine, [small beta]-ketoenamine, and hydrogen-bonded imine-linked covalent organic frameworks using liquid-assisted grinding

Chem. Commun. - 14 July, 2014 - 12:17

Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC03389B, CommunicationGobinda Das, Digambar Balaji Shinde, Sharath Kandambeth, Bishnu P. Biswal, Rahul Banerjee
Dynamic covalent bond formation is dramatically accelerated under Liquid-Assisted Grinding (LAG) conditions leading to improved crystalline COFs efficiently at a faster rate and in high yield.
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Efficient synthesis of carbazolespirooxindole skeletons via asymmetric Diels-Alder reaction of 3-vinylindoles and methyleneindolinones

Chem. Commun. - 14 July, 2014 - 12:17

Chem. Commun., 2014, 50,8794-8796
DOI: 10.1039/C4CC03135K, CommunicationHaifeng Zheng, Peng He, Yangbin Liu, Yulong Zhang, Xiaohua Liu, Lili Lin, Xiaoming Feng
A mild, highly efficient asymmetric Diels-Alder reaction, catalyzed by chiral N,N[prime or minute]-dioxide-Ni(II) complexes, has been achieved for the synthesis of chiral carbazolespirooxindole derivatives. A wide variety of substrates were readily tolerated, generating exclusively the corresponding exo-products.
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Enantioselective phospha-Michael addition of diarylphosphines to [small beta],[gamma]-unsaturated [small alpha]-ketoesters and amides

Chem. Commun. - 14 July, 2014 - 12:17

Chem. Commun., 2014, 50,8768-8770
DOI: 10.1039/C4CC01610F, CommunicationRenta Jonathan Chew, Kai Yuan Teo, Yinhua Huang, Bin-Bin Li, Yongxin Li, Sumod A. Pullarkat, Pak-Hing Leung
A chiral palladacycle catalyzed hydrophosphination of [small beta],[gamma]-unsaturated [small alpha]-ketoesters and amides has been developed; with up to 99% yield and 90% ee.
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New potassium-sodium niobate material system: a giant-d33 and high-TC lead-free piezoelectric

Dalton Transactions - 13 July, 2014 - 17:54

Dalton Trans., 2014, 43,11759-11766
DOI: 10.1039/C4DT01293C, PaperTing Zheng, Jiagang Wu, Xiaojing Cheng, Xiaopeng Wang, Binyu Zhang, Dingquan Xiao, Jianguo Zhu, Xiaojie Lou, Xiangjian Wang
A giant d33 ([similar]400 pC/N) and a high TC ([similar]292 [degree]C) have been simultaneously achieved in the (1 - x)K0.40Na0.60Nb0.965Sb0.035O3-xBi0.5Li0.5ZrO3 lead-free ceramics by forming the R-T phase boundary.
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Electronic excited states of chromium and vanadium bisarene complexes revisited: interpretation of the absorption spectra on the basis of TD DFT calculations

Dalton Transactions - 13 July, 2014 - 17:54

Dalton Trans., 2014, Advance Article
DOI: 10.1039/C4DT01481B, PaperSergey Ketkov, Nikolai Isachenkov, Elena Rychagova, Wen-Bih Tzeng
The influence of the ([small eta]6-arene)2M (M = Cr, V, Cr+) composition on parameters of intravalency and Rydberg transitions is explained on the basis of time-dependent DFT.
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Tuning of photocatalytic activity by creating a tridentate coordination sphere for palladium

Dalton Transactions - 13 July, 2014 - 17:54

Dalton Trans., 2014, 43,11676-11686
DOI: 10.1039/C4DT01034E, PaperM. G. Pfeffer, L. Zedler, S. Kupfer, M. Paul, M. Schwalbe, K. Peuntinger, D. M. Guldi, J. Guthmuller, J. Popp, S. Grafe, B. Dietzek, S. Rau
Intramolecular ruthenium palladium hydrogen evolving photocatalyst containing a novel coordination pocket for the catalytic centre.
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A-site size effect in a family of unfilled ferroelectric tetragonal tungsten bronzes: Ba4R0.67Nb10O30 (R = La, Nd, Sm, Gd, Dy and Y)

Dalton Transactions - 13 July, 2014 - 17:54

Dalton Trans., 2014, 43,11687-11695
DOI: 10.1039/C4DT00126E, PaperOpen Access Open Access Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Jonathan Gardner, Finlay D. Morrison
The structure of a family of ferroelectric unfilled tetragonal tungsten bronze oxides can be approximated to be metrically tetragonal allowing a simple correlation of tetragonality with Curie temperature.
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Inorganic/organic small molecular semiconductor self-assembly to functional core-shell nanoarchitectures for ultrasensitive chemiresistors to aniline vapor

Dalton Transactions - 13 July, 2014 - 17:54

Dalton Trans., 2014, 43,11542-11547
DOI: 10.1039/C4DT00962B, PaperKe Wang, Hui Yang, Xuemin Qian, Zheng Xue, Yongjun Li, Huibiao Liu, Yuliang Li
Novel inorganic/organic core-shell nanoparticles for ultrasensitive chemiresistors to aniline have been prepared by a new method.
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