An iterative approach toward the synthesis of discrete oligomeric p-phenylene vinylene organic dyes employing aqueous Wittig chemistry
摘要:
Photovoltaic research has become increasingly prominent as the search for alternatives to fossil fuels are actively sought. A novel process for the iterative synthesis of discrete donor/acceptor-flanked oligostilbenes, key constituents in dye-sensitized solar cells, is described. The aqueous Wittig process is high yielding, proceeds with high (E)-stereoselectivity and allows facile product purification. (C) 2011 Elsevier Ltd. All rights reserved.
Microwave-Assisted, Aqueous Wittig Reactions: Organic-Solvent- and Protecting-Group-Free Chemoselective Synthesis of Functionalized Alkenes
作者:James McNulty、Priyabrata Das、David McLeod
DOI:10.1002/chem.201000438
日期:——
Free from protection! A general, chemoselective, protecting‐group‐ and organic‐solvent‐free route to stilbenes and heterostilbenes involving the direct synthesis of triethyl benzylic and allylic phosphonium salts from the corresponding alcohols and their microwave‐assisted, aqueous Wittig reactions is described.
Inhibition and Dispersion of Bacterial Biofilms with 2-Aminobenzimidazole Derivatives
申请人:BLACKWELL Helen
公开号:US20130136782A1
公开(公告)日:2013-05-30
Compounds described herein inhibit biofilm formation or disperse pre-formed biofilms of Gram-negative bacteria. Biofilm-inhibitory compounds can be encapsulated or contained in a polymer matrix for controlled release. Coatings, films, multilayer films, hydrogels, microspheres and nanospheres as well as pharmaceutical compositions and disinfecting compositions containing biofilm-inhibitory compounds are also provided. Methods for inhibiting formation of biofilms or dispersing already formed biofilms are provided. Methods for treating infections of gram-negative bacteria which form biofilms, particularly those of
Pseudomonas
and more particularly
P. aeruginosa.
2-Aminobenzimidazole Derivatives Strongly Inhibit and Disperse<i>Pseudomonas aeruginosa</i>Biofilms
作者:Reto Frei、Anthony S. Breitbach、Helen E. Blackwell
DOI:10.1002/anie.201109258
日期:2012.5.21
antibiotics and constitute a significant health threat. 2‐Aminobenzimidazole derivatives (see scheme) are capable of stronglyinhibiting the growth of and dispersing Pseudomonas aeruginosa biofilms. These molecules were found to modulate quorum sensing in reporter strains, and represent some of strongest P. aeruginosa biofilm inhibitors known.
Amine- and Sulfonamide-Promoted Wittig Olefination Reactions in Water
作者:James McNulty、David McLeod
DOI:10.1002/chem.201101153
日期:2011.8.1
Amine‐promoted olefination: The reaction of a phosphonium salt and an aldehyde in water to yield alkenes with high E‐configurational control is promoted by catalytic amounts of non‐basic amines in aqueous bicarbonate media (see scheme). Possible catalytic cycles involving imines and iminium intermediates are discussed.
Discovery of an Acid-Promoted [3+2] Cyclodimerization of 3-Vinylindoles and the Development of a General Lewis Acid Catalyzed Process
作者:James McNulty、David McLeod
DOI:10.1055/s-0030-1259688
日期:2011.3
A novel proton-catalyzed [3+2]-type cyclodimerization of 3-vinylindoles is reported leading to fused cyclopenta[b]indoles, contrasting to the normal [4+2]-cycloaddition pathway. The development of a general, high yielding version of the reaction catalyzed by zinc bromide in toluene is described.