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Showing 25 to 36 of 439 entries
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Intramolecular [4 + 2] cycloadditions of 1,3-enynes or arylalkynes with alkenes with highly reactive cationic phosphine Au(I) complexes.

Journal of the American Chemical Society

Nieto-Oberhuber C, López S, Echavarren AM.
PMID: 15853316
J Am Chem Soc. 2005 May 04;127(17):6178-9. doi: 10.1021/ja042257t.

New Au(I) complexes with bulky, biphenyl phosphines are the most reactive catalysts for the cyclizations of enynes. 1,6-Enynes with an aryl ring at the alkyne give 2,3,9,9a-tetrahydro-1H-cyclopenta[b]naphthalenes by a 5-exo-dig cyclization followed by a Nazarov-type ring expansion. 1,8-Dien-3-ynes also...

Amphiphilic telechelic poly(N-isopropylacrylamide) in water: from micelles to gels.

The European physical journal. E, Soft matter

Kujawa P, Watanabe H, Tanaka F, Winnik FM.
PMID: 15880290
Eur Phys J E Soft Matter. 2005 Jun;17(2):129-37. doi: 10.1140/epje/i2004-10134-9. Epub 2005 May 06.

We report the first study of aqueous solutions (0.025 gL(-1) to 46 gL(-1)) of a telechelic poly(N-isopropylacrylamide) with octadecyl termini (C(18)-PNIPAM-C(18), M(w): 37000, 320 NIPAM units, M(w)/ M(n)=1.07) obtained by reversible addition-fragmentation chain transfer (RAFT) free radical polymerization of...

Influence of anionic sulfonate-containing co-ligands on the solid structures of silver complexes supported by 4,4'-bipyridine bridges.

Dalton transactions (Cambridge, England : 2003)

Wu H, Dong XW, Liu HY, Ma JF, Li SL, Yang J, Liu YY, Su ZM.
PMID: 18827940
Dalton Trans. 2008 Oct 21;(39):5331-41. doi: 10.1039/b806195e. Epub 2008 Aug 18.

In this paper, ten new silver compounds, namely [Ag(bipy)](L1).H2O (1), [Ag(bipy)](L2).2H2O (2), [Ag2(bipy)2(H2O)2](L3).H2O (3), [Ag(L4)(bipy)].H2O (4), [Ag(L5)(bipy)] (5), [Ag(L6)(bipy)].0.5CH3CN (6), [Ag3(L7)2(bipy)2].2(H2O) (7), [Ag2(L8)(bipy)1.5(H2O)].H2O (8), [Ag2(L9)(bipy)2(H2O)2] (9) and [Ag3(L10)(bipy)2][(bipy)(H2O)2].(H2O)3.5 (10) (where bipy = 4,4'-bipyridine, L1 = 6-amino-1-naphthalenesulfonate anion, L2 =...

Aromatic compounds in molecular phase of Baltic amber-synchronous luminescence analysis.

Talanta

Matuszewska A, Czaja M.
PMID: 18968585
Talanta. 2002 Apr 08;56(6):1049-59. doi: 10.1016/s0039-9140(01)00610-5.

Synchronous luminescence analysis was performed in order to identify aromatic compounds in solvent extracts of Baltic amber. The investigated extracts were obtained, for comparisons, as products of extraction by various techniques and solvents. Methylene chloride and ethanol were applied...

Chemical fingerprinting of adhesive tapes by GCMS detection of petroleum hydrocarbon products.

Journal of forensic sciences

Aziz N, Greenwood PF, Grice K, John Watling R, van Bronswijk W.
PMID: 18631281
J Forensic Sci. 2008 Sep;53(5):1130-7. doi: 10.1111/j.1556-4029.2008.00798.x. Epub 2008 Jul 08.

Pressure-sensitive adhesive tapes often represent key evidence of crimes such as assault, rape or homicide; thus, the development of analytical techniques able to contribute to a detailed characterization of these materials is of forensic importance. The gas chromatography-mass spectrometry...

Some aspects of room-temperature phosphorescence in liquid solutions.

Talanta

Donkerbroek JJ, Elzas JJ, Gooijer C, Frei RW, Velthorst NH.
PMID: 18962992
Talanta. 1981 Oct;28(10):717-23. doi: 10.1016/0039-9140(81)80112-9.

Experimental requirements for room-temperature phosphorescence measurements in liquids (RTPL) are discussed. Phosphorescence quantum yields and triplet lifetimes of some brominated naphthalenes and halogenated biphenyls at 77 K in 2-methyltetrahydrofuran and at room temperature in hexane are reported and compared....

Determination of chromium(vi) in natural waters by the sorption of chromium-diphenylcarbazone with xad-2 resin.

Talanta

Osaki S, Osaki T, Takashima Y.
PMID: 18963443
Talanta. 1983 Sep;30(9):683-6. doi: 10.1016/0039-9140(83)80156-8.

The sorption of the chromium(III)-diphenylcarbazone complex (Cr-DPC) with XAD-2 has been investigated, for use in the separation of Cr(VI) from Cr(III) species in natural waters. Cr-DPC is formed from the reaction of Cr(VI) with diphenylcarbazide, but Cr(III) species give...

Structures of 1-(arylseleninyl)naphthalenes: O, G, and Y dependences in 8-G-1-[p-YC6H4Se(O)]C10H6.

The Journal of organic chemistry

Hayashi S, Wada H, Ueno T, Nakanishi W.
PMID: 16839136
J Org Chem. 2006 Jul 21;71(15):5574-85. doi: 10.1021/jo060527f.

Structures of 8-G-1-[p-YC6H4Se(O)]C10H6 [1 (G = H), 2 (G = F), 3 (G = Cl), and 4 (G = Br): Y = H, OMe, OCH2Ph, t-Bu, Me, Cl, and NO2] and (1-C10H7)2SeO (5) are investigated by the X-ray crystallographic...

2-alpha-hydroxyalkyl- and 2,7-di(alpha-hydroxyalkyl)-1,8-bis(dimethylamino)naphthalenes: stabilization of nonconventional in/out conformers of "proton sponges" via N...H-O intramolecular hydrogen bonding. A remarkable kind of tandem nitrogen inversion.

The Journal of organic chemistry

Pozharskii AF, Degtyarev AV, Ryabtsova OV, Ozeryanskii VA, Kletskii ME, Starikova ZA, Sobczyk L, Filarowski A.
PMID: 17378612
J Org Chem. 2007 Apr 13;72(8):3006-19. doi: 10.1021/jo062667v. Epub 2007 Mar 23.

A regular set of 2-(alpha-hydroxymethyl)- and 2,7-di(alpha-hydroxymethyl)-1,8-bis(dimethylamino)naphthalenes has been prepared. Their X-ray, NMR, and IR studies have demonstrated that in tertiary mono-alcohols the orientation of free nitrogen electron pairs in crystals and solution corresponds to nonconventional in/out conformers stabilized...

Aromatic molecules in restricted geometries: photophysics of naphthalene included in a cyclodextrin functionalized layered solid.

The journal of physical chemistry. B

Mohanambe L, Vasudevan S.
PMID: 16853933
J Phys Chem B. 2005 Dec 01;109(47):22523-9. doi: 10.1021/jp053925f.

The galleries of an Mg-Al layered double hydroxide have been functionalized by intercalation of carboxymethyl beta-cyclodextrin cavities. The anchored cavities form a random array of identical-sized hydrophobic nanopockets arranged in a bilayer fashion in the interlamellar space of the...

Aromatic sulphonate ion-selective electrode membrane with crystal violet as ion-exchange site.

Talanta

Ishibashi N, Kohara H, Horinouchi K.
PMID: 18961356
Talanta. 1973 Sep;20(9):867-74. doi: 10.1016/0039-9140(73)80202-4.

Four triphenylmethane derivatives (cations) and a high molecular-weight quaternary ammonium ion were used as the ion-exchange site in the liquid membranes of electrodes responsive to aromatic sulphonate ions, such as benzenesulphonate and alpha-naphthalenesulphonate. The nitrobenzene or 1,2-dichloroethane membrane containing...

Use of an ipb-lux Fusion To Study Regulation of the Isopropylbenzene Catabolism Operon of Pseudomonas putida RE204 and To Detect Hydrophobic Pollutants in the Environment.

Applied and environmental microbiology

Selifonova OV, Eaton RW.
PMID: 16535269
Appl Environ Microbiol. 1996 Mar;62(3):778-83. doi: 10.1128/aem.62.3.778-783.1996.

A DNA segment involved in the regulation of the isopropylbenzene (cumene) catabolism operon (ipb) of plasmid pRE4 from Pseudomonas putida RE204 and the Vibrio fischeri luciferase genes, luxCDABE, were used to create an ipbRo/pA(prm1)-luxCDABE reporter fusion plasmid, pOS25. Escherichia...

Showing 25 to 36 of 439 entries