			Home About us Contact

Convenient Access (convenient + access)

Distribution by Scientific Domains

Chemistry	90%

Distribution within Chemistry

Organic Chemistry	60%
General & Introductory Chemistry	30%

Selected Abstracts

Brominated 4-(Trifluoromethyl)pyrimidines: A Convenient Access to Versatile Intermediates

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 20 2004
Levente Ondi
An expedient route to all three monobrominated and all three dibrominated isomers of 4-(trifluoromethyl)pyrimidine, and to several other halogenated pyrimidines, is described. Key steps are the electrophilic introduction of the halogen in the 5-position of 2- or 4-pyrimidinones, the bromodeoxygenation of pyrimidinones or thiopyrimidinones using phosphorus tribromide, and the partial debromination of dibromo-4-(trifluoromethyl)pyrimidines. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004) [source]

Bismuth Triflate-Catalyzed Addition of Allylsilanes to N -Alkoxycarbonylamino Sulfones: Convenient Access to 3-Cbz-Protected Cyclohexenylamines

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2009
Thierry Ollevier
Abstract Bismuth triflate was found to be an efficient catalyst in the Sakurai reaction of allyltrimethylsilanes with N -alkoxycarbonylamino sulfones. The reaction proceeded smoothly with a low catalyst loading of Bi(OTf)3,4,H2O (2,5,mol%) to afford the corresponding protected homoallylic amines in very good yields (up to 96%). A sequential allylation reaction followed by ring-closing metathesis delivers 6,8 membered 3-Cbz-protected cycloalkenylamines. [source]

Convenient Access to Monosilicon Epoxides with Pentacoordinate Silicon,

ANGEWANDTE CHEMIE, Issue 23 2010
Rajendra
Von einer Zwischenstufe zu einem stabilen Molekül: Stabile Monosiliciumepoxide mit fünffach koordiniertem Silicium wurden erstmals durch [2+1]-Cycloaddition von Lewis-Base-stabilisierten Chlorsilylenen mit Ketonen hergestellt. Die Molekülstrukturen dieser Verbindungen mit ihren dreigliedrigen SiOC-Ringen wurden durch Röntgenbeugungsstudien ermittelt (siehe Beispiel; N,blau, O,rot, Cl,grün). [source]

ChemInform Abstract: Convenient Access to C-2 or C-5 Substituted 4-Azaindole Derivatives.

CHEMINFORM, Issue 18 2010
Fabienne Saab
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Convenient Access to ,-Substituted Chiral Phenones.

CHEMINFORM, Issue 39 2009
Xiu-Fang Cao
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Ortho-Selective Nucleophilic Aromatic Substitution Reactions of Polyhaloanilines with Potassium/Sodium O-Ethyl Xanthate: A Convenient Access to Halogenated 2(3H)-Benzothiazolethiones.

CHEMINFORM, Issue 8 2005
Lei Zhu
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Convenient Access to Substituted Acridines by a Buchwald,Hartwig Amination.

CHEMINFORM, Issue 43 2004
Rene Csuk
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Synthesis of 4-[18F]fluoroiodobenzene and its application in sonogashira cross-coupling reactions

JOURNAL OF LABELLED COMPOUNDS AND RADIOPHARMACEUTICALS, Issue 8 2003
Frank R. Wüst
Abstract The first application of a Sonogashira cross-coupling reaction in 18F chemistry has been developed. The reaction was exemplified by the cross-coupling of terminal alkynes (ethynylcyclopentyl carbinol 6, 17,-ethynyl-3,17,-estradiol 7 and 17,-ethynyl-3-methoxy-3,17,-estradiol 8) with 4-[18F]fluoroiodobenzene. 4,4,-Diiododiaryliodonium salts were used as precursors for the synthesis of 4-[18F]fluoroiodobenzene, enabling the convenient access to 4-[18F]fluoroiodobenzene in 13,70% yield using conventional heating or microwave activation. The Sonogashira cross-coupling of 4-[18F]fluoroiodobenzene with terminal alkynes gave the corresponding 4-[18F]fluorophenylethynyl-substituted compounds [18F]-9, [18F]-10 and [18F]-13 in yields up to 88% within 20 min of starting from 4-[18F]fluoroiodobenzene. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Highly Enantioselective Michael Addition of Malononitrile to Vinylogous Imine Intermediates Generated in situ from Arylsulfonyl Indoles

CHEMISTRY - A EUROPEAN JOURNAL, Issue 36 2010
Linhai Jing
Malononitrile on rare form: Highly enantioselective Michael addition of malononitrile to vinylogous imine intermediates 2, generated in situ from arylsulfonyl indoles 1, is described (see scheme). This protocol provides easy and convenient access to valuable 3-indolyl derivatives 3 in high yields and enantioselectivities. A possible catalytic mechanism is proposed. [source]

Lipases-Catalyzed Alcoholysis for the Preparation of Chiral 1- or 2-Hydroxyalkanephosphonates,

CHINESE JOURNAL OF CHEMISTRY, Issue 1 2003
Zhang Yong-Hui
Abstract Enzymatic alcoholysis has been developed for the preparation of some chiral 1- and 2-hydroxyalkanephosphonates with high optical purity. This method ensures the convenient access to the optically pure phosphocarnitine, phosphogabob and phosphomycin. [source]

Why do adults entitled to free or highly subsidized dental services select fully out-of-pocket-paid care?

COMMUNITY DENTISTRY AND ORAL EPIDEMIOLOGY, Issue 1 2010
Fariborz Bayat
Bayat F, Vehkalahti MM, Murtomaa H, Tala H. Why do adults entitled to free or highly subsidized dental services select fully out-of-pocket-paid care? Community Dent Oral Epidemiol 2010; 38: 88,95. © 2009 John Wiley & Sons A/S Abstract,,, Objective:, To investigate patients' reasons for selecting a dental clinic given their choice of free or highly-subsidized dental services. Methods:, The study was based on cross-sectional data obtained through phone interviews with adults in Tehran, Iran. The present study included those entitled to free or highly-subsidized dental services (n = 726). The data covered the patients' awareness of subsidized dental services and type of dental clinic for their most recent visit and their reasons for selecting that clinic. Awareness of subsidized dental services was dichotomized as being either aware or unaware of such subsidy. The type of clinic was dichotomized as providing either free or highly-subsidized (FHS) or fully out-of-pocket paid (FOP) services. Free format answers about the subjects' reasons for selecting a particular clinic were later sub-grouped as: convenient access, good technical aspects, good interpersonal aspects, low or reasonable fees, recommendation by a friend, and no reason. Socio-demographic status was based on background. Data analysis included the chi-square test and logistic regression model. Results:, Of the subjects (n = 726), 60% were women and 58% were under 35 years of age. The subjects' mean age was 33.5 years with no difference by gender (P = 0.24) and the majority had public insurance (91%). Of all the subjects, 60% selected FOP. Good interpersonal aspects were the strongest reason for selecting FOP (OR = 4.6), follow by good technical aspects (OR = 2.3). Those subjects who were unaware of their benefit had 4.6 times the odds of selecting FOP. Conclusions:, Despite the opportunity to use highly-subsidized dental services, good interpersonal and good technical aspects lead patients to select private dentists and to pay fully out of pocket. [source]