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Showing 1 to 12 of 345 entries
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Microwave-Assisted Synthesis of Heteroleptic Ir(III)(+) Polypyridyl Complexes.

The Journal of organic chemistry

Monos TM, Sun AC, McAtee RC, Devery JJ, Stephenson CR.
PMID: 27301646
J Org Chem. 2016 Aug 19;81(16):6988-94. doi: 10.1021/acs.joc.6b00983. Epub 2016 Jun 23.

We report a rapid, one-pot, operationally simple, and scalable preparation of valuable cationic heteroleptic iridium(III) polypyridyl photosensitizers. This method takes advantage of two consecutive microwave irradiation steps in the same reactor vial, avoiding the need for additional reaction purifications....

Effects of ferumoxytol on quantitative PET measurements in simultaneous PET/MR whole-body imaging: a pilot study in a baboon model.

EJNMMI physics

Borra RJ, Cho HS, Bowen SL, Attenberger U, Arabasz G, Catana C, Josephson L, Rosen BR, Guimaraes AR, Hooker JM.
PMID: 26501808
EJNMMI Phys. 2015 Dec;2(1):6. doi: 10.1186/s40658-015-0109-0. Epub 2015 Feb 26.

BACKGROUND: Simultaneous PET/MR imaging depends on MR-derived attenuation maps (mu-maps) for accurate attenuation correction of PET data. Currently, these maps are derived from gradient-echo-based MR sequences, which are sensitive to susceptibility changes. Iron oxide magnetic nanoparticles have been used...

The Role of Substituent Effects in Tuning Metallophilic Interactions and Emission Energy of Bis-4-(2-pyridyl)-1,2,3-triazolatoplatinum(II) Complexes.

Angewandte Chemie (International ed. in English)

Prabhath MR, Romanova J, Curry RJ, Silva SR, Jarowski PD.
PMID: 26015153
Angew Chem Int Ed Engl. 2015 Jun 26;54(27):7949-53. doi: 10.1002/anie.201502390. Epub 2015 May 26.

The photoluminescence spectra of a series of 5-substituted pyridyl-1,2,3-triazolato Pt(II) homoleptic complexes show weak emission tunability (ranging from λ=397-408 nm) in dilute (10(-6) M) ethanolic solutions at the monomer level and strong tunability in concentrated solutions (10(-4) M) and...

The Multidisciplinary Approach Needs to Extend Into Head and Neck Cancer Clinical Trials.

International journal of radiation oncology, biology, physics

Corry J, Yom SS.
PMID: 26853330
Int J Radiat Oncol Biol Phys. 2016 Feb 01;94(2):217-20. doi: 10.1016/j.ijrobp.2015.09.029.

No abstract available.

Broad-spectrum enantioselective diels-alder catalysis by chiral, cationic oxazaborolidines.

Journal of the American Chemical Society

Ryu DH, Lee TW, Corey EJ.
PMID: 12188655
J Am Chem Soc. 2002 Aug 28;124(34):9992-3. doi: 10.1021/ja027468h.

The cationic chiral Lewis acids 1 and 2, generated by triflic acid protonation of the corresponding neutral oxazaborolidines, serve as excellent catalysts for Diels-Alder addition of cyclopentadiene to a wide variety of dienophiles. Adducts have been obtained in excellent...

Catalytic enantioselective conjugate addition of trimethylsilylacetylene to 2-cyclohexen-1-one.

Organic letters

Kwak YS, Corey EJ.
PMID: 15355058
Org Lett. 2004 Sep 16;6(19):3385-8. doi: 10.1021/ol048623v.

[reaction: see text] The first example of catalytic asymmetric conjugate addition of TMS-acetylene to a cyclic alpha,beta-enone has been accomplished using the chiral bisoxazoline-Ni complex 9 as catalyst and dimethylalumino TMS-acetylide and 2-cyclohexen-1-one as reactants.

Highly enantioselective dimerization of alpha,beta-enones catalyzed by a rigid quaternary ammonium salt.

Organic letters

Zhang FY, Corey EJ.
PMID: 15355061
Org Lett. 2004 Sep 16;6(19):3397-9. doi: 10.1021/ol048583v.

[reaction: see text] The chiral quaternary ammonium salt 1 served as a phase-transfer catalyst for the enantioselective dimerization of alpha,beta-enones, providing a route for the asymmetric syntheses of chiral 1,5-dicarbonyl compounds and alpha-alkylated gamma-keto acids.

A general process for the haloamidation of olefins. Scope and mechanism.

Journal of the American Chemical Society

Yeung YY, Gao X, Corey EJ.
PMID: 16866514
J Am Chem Soc. 2006 Aug 02;128(30):9644-5. doi: 10.1021/ja063675w.

A methodology is described for the addition of a bromine atom and an amide nitrogen in a trans sense to an olefinic double bond. The process, which is illustrated by numerous examples, involves the use of an N-bromoamide and...

Application of an intramolecular dipolar cycloaddition to an asymmetric synthesis of the fully oxygenated tricyclic core of the stemofoline alkaloids.

Tetrahedron

Carra RJ, Epperson MT, Gin DY.
PMID: 18443655
Tetrahedron. 2008 Apr 21;64(17):3629-3641. doi: 10.1016/j.tet.2008.02.008.

An intramolecular non-stabilized azomethine ylide dipolar cycloaddition was applied toward the first non-racemic synthesis of the fully-oxygenated bridged pyrrolizidine core (45) of (+)-stemofoline (1) in eleven steps from a commercially available starting material.

Synthesis of oxacalixarenes incorporating nitrogen heterocycles: evidence for thermodynamic control.

Organic letters

Katz JL, Geller BJ, Conry RR.
PMID: 16774249
Org Lett. 2006 Jun 22;8(13):2755-8. doi: 10.1021/ol060823e.

[structure: see text] Oxacalix[2]arene[2]hetarenes are formed in a single step by cyclooligomerization of meta-diphenols with meta-dichlorinated azaheterocycles. The high selectivity for cyclic tetramer formation results from thermodynamic product control. Macrocycles as large as oxacalix[5]arene[5]hetarenes have been isolated under nonequilibrating...

Nonparallelism between reaction rate and dienophile-catalyst affinity in catalytic enantioselective Diels-Alder reactions.

Organic letters

Ryu DH, Zhou G, Corey EJ.
PMID: 15816770
Org Lett. 2005 Apr 14;7(8):1633-6. doi: 10.1021/ol0503236.

[reaction: see text] The above reaction is much faster with Y = CF(3)CH(2)O than with Y = CH(3)O. However, the methyl ester is a strong inhibitor of the Diels-Alder reaction of the trifluoroethyl ester, since it has a higher...

Marine genetics - a cautionary tale with a happy ending (so far).

Trends in ecology & evolution

Berry RJ.
PMID: 21237107
Trends Ecol Evol. 1995 Nov;10(11):472. doi: 10.1016/s0169-5347(00)89189-2.

No abstract available.

Showing 1 to 12 of 345 entries