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Double C (double + c)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

ChemInform Abstract: Zipper-Mode Double C,H Activation: Palladium-Catalyzed Direct Construction of Highly Fused Heterocyclic Systems.

CHEMINFORM, Issue 14 2008
Hiroaki Ohno
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]

Double C,H Activation Strategy for the Asymmetric Synthesis of C2 -Symmetric Anilines.

CHEMINFORM, Issue 41 2004
Huw M. L. Davies
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Acid-Free Synthesis of Carbazoles and Carbazolequinones by Intramolecular Pd-Catalyzed, Microwave-Assisted Oxidative Biaryl Coupling Reactions , Efficient Syntheses of Murrayafoline A, 2-Methoxy-3-methylcarbazole, and Glycozolidine

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 27 2009
Vellaisamy Sridharan
Abstract A mild and efficient methodology for the synthesis of oxygenated carbazoles from diarylamines under non-acidic conditions was developed, based on a palladium-catalyzed, microwave-assisted double C,H bond activation process. This new protocol was successfully applied to the synthesis of three naturally occurring carbazoles, namely murrayafoline A, 2-methoxy-3-methylcarbazole, and glycozolidine. The scope of the reaction was also expanded to include the synthesis of benzo fused carbazolequinones.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Concerning the Structure of [18]Annulene

HELVETICA CHIMICA ACTA, Issue 8 2005
Otto Ermer
A recent computational study of Schleyer and co-workers [1] is reviewed, which led these authors to the firm conclusion that [18]annulene has a localized structure with alternating single and double C,C bonds, contrary to earlier crystallographic analyses of X-ray-diffraction data favoring a delocalized non-alternating form. It is pointed out i) that deceptive orientational disorder phenomena in the crystal might be subject to experimental resolution in this case, and ii) that, in contrast to gas and solution phases, [18]annulene might possibly assume the non-alternating structure in the crystalline solid state. [source]

N,N,-Bis(2-pyridyl)benzene-1,2-diamine

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2004
Maria Gdaniec
Hindered rotation about the partial double C,N bonds between the amine and pyridine moieties in the title mol­ecule, C16H14N4, results in two different conformations of the N -aryl-2-amino­pyridine units. One, assuming an E conformation, is involved in a pair of N,H,N hydrogen bonds that generate a centrosymmetric (8) motif. The second, adopting a Z conformation, is not engaged in any hydrogen bonding and is flattened, the dihedral angle between the benzene and pyridine rings being 12.07,(7)°. This conformation is stabilized by an intramolecular C,H,N interaction [C,N,= 2.9126,(19),Å, H,N,=,2.31,Å and C,H,N,=,120°]. [source]