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Intramolecular C (intramolecular + c)

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Chemistry100%

Selected Abstracts

Intramolecular C -thiocarbamoylation of aroxy(isothiocyanato)phosphonium salts

HETEROATOM CHEMISTRY, Issue 7 2008
R. V. Smalii
Isothiocyanatophosphonium salts bearing an aroxy group at the phosphorus atom have been obtained for the first time. As found, these compounds undergo an intramolecular heterocyclization to give hitherto unknown benzoxazaphosphininethiones or cyanoiminophosphoranes, according to the nature of the substituents on the aryl ring. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:667,670, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20491 [source]

(1-Pyridinio)perfluorophenacylide: a new stable pyridinium ylide in the enol form

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2008
Shinji Yamada
The title compound, C13H6F5NO, exists in the enol form and adopts the E configuration about the enol double bond. It is the first example of an enol-type pyridinium ylide. The enol structure was unambiguously determined on the basis of the significantly longer C,O bond and shorter C,C bond. Intramolecular C,H...O and C,H...F hydrogen bonds are responsible for promotion of the enol form and for the stability of this compound. [source]

ChemInform Abstract: Nano-Iron Oxide as a Recyclable Catalyst for Intramolecular C,N Cross-Coupling Reactions under Ligand-Free Conditions: One-Pot Synthesis of 1,4-Dihydroquinoline Derivatives.

CHEMINFORM, Issue 17 2010
Xiao-Jin Wu
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: Spirolactone Syntheses Through a Rhodium-Catalyzed Intramolecular C,H Insertion Reaction: Model Studies Towards the Synthesis of Syringolides.

CHEMINFORM, Issue 10 2010
Mauricio Navarro Villalobos
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: Synthesis of Condensed Pyrroloindoles via Pd-Catalyzed Intramolecular C,H Bond Functionalization of Pyrroles.

CHEMINFORM, Issue 18 2009
Seung Jun Hwang
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]

ChemInform Abstract: Auto-Tandem Catalysis: Synthesis of Substituted 11H-Indolo[3,2-c]quinolines via Palladium-Catalyzed Intermolecular C,N and Intramolecular C,C Bond Formation.

CHEMINFORM, Issue 27 2008
Caroline Meyers
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]

ChemInform Abstract: Palladium-Catalyzed Intramolecular C,O Bond Formation: An Approach to the Synthesis of Chiral Benzodioxocines.

CHEMINFORM, Issue 21 2008
Arpita Neogi
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]

ChemInform Abstract: Regio- and Stereocontrol Elements in Rh(II)-Catalyzed Intramolecular C,H Insertion of ,-Diazo-,-(phenylsulfonyl)acetamides.

CHEMINFORM, Issue 10 2002
Cheol Hwan Yoon
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: Catalytic Asymmetric Synthesis of 1,1,-Spirobi[indan-3,3,-dione] via a Double Intramolecular C,H Insertion Process.

CHEMINFORM, Issue 52 2001
Teruki Takahashi
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: Asymmetric Intramolecular C,H Insertions of Aryldiazoacetates.

CHEMINFORM, Issue 36 2001
Huw M. L. Davies
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]

Stereogenic Evolution of clasto -Lactacystin ,-Lactone from L -Serine

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 1 2007
Cheol H. Yoon
Abstract Reported herein is a novel synthesis of clasto -lactacystin ,-lactone. The ,-lactam core was selectively prepared by an intramolecular C,H insertion to establish the stereocenter, C(6). The ensuing construction of the quaternary C(5) and carbinol C(9) centers was facilitated by aldol with excellent stereoselection. All these new stereochemistries were induced by the inherent chirality of L -serine without employing chiral auxiliaries or reagents. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

1,3,4-Triphenyl-7-trifluoromethyl-1H -pyrazolo[3,4- b]quinoline at 293 and 100,K

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2010
Szlachcic
In the structure of the title compound, C29H18F3N3, belonging to the space group P65 (or P61), three symmetry-independent molecules are arranged in two chains, with two molecules alternating along the 32 axes, whereas the remaining molecule forms a chain along [0001] due to the 65 screw axis. The conformation of each of the molecules is stabilized by an intramolecular C,H...N hydrogen bond, with C...N distances in the range 2.964,(6),3.069,(5),Å at room temperature (293,K) and 2.943,(4),3.084,(4),Å at low temperature (100,K). One molecule has its ,CF3 group ordered even at 293,K, which can be explained only by considering its involvement in two weak intermolecular C,H...F interactions, with C...F distances in the range 3.084,(6),3.302,(5),Å at 293,K and 3.070,(3),3.196,(3),Å at 100,K, and also a C,F...N interaction, with a C...N distance of 3.823,(5),Å at 293,K and 3.722,(4),Å at 100,K. The trifluoromethyl groups in the two remaining molecules are disordered at 293,K, whereas at 100,K the continuous (dynamic) positional disorder of one of the ,CF3 groups (of the molecule forming the chain along [0001]) is totally eliminated while the ,CF3 group disorder remains for the third molecule. [source]

4,4,-Bis(2,2,2-trifluoroethoxymethyl)-2,2,-bipyridine

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2010
Norman Lu
As part of a homologous series of novel polyfluorinated bipyridyl (bpy) ligands, the title compound, C16H14F6N2O2, contains the smallest fluorinated group, viz. CF3. The molecule resides on a crystallographic inversion centre at the mid-point of the pyridine Cipso,Cipso bond. Therefore, the bpy skeleton lies in an anti conformation to avoid repulsion between the two pyridyl N atoms. Weak intramolecular C,H...N and C,H...O interactions are observed, similar to those in related polyfluorinated bpy,metal complexes. A ,,, interaction is observed between the bpy rings of adjacent molecules and this is probably a primary driving force in crystallization. Weak intermolecular C,H...N hydrogen bonding is present between one of the CF3CH2, methylene H atoms and a pyridyl N atom related by translation along the [010] direction, in addition to weak benzyl-type C,H...F interactions to atoms of the terminal CF3 group. It is of note that the O,CH2CF3 bond is almost perpendicular to the bpy plane. [source]

N4 -Methyl- N4 -(2-methylphenyl)-1H -pyrazolo[3,4- d]pyrimidine-4,6-diamine,ethanol,hydrazine (1/0.865/0.135): hydrogen-bonded ribbons containing four independent ring types

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2009
Jorge Trilleras
N4 -Methyl- N4 -(2-methylphenyl)-1H -pyrazolo[3,4- d]pyrimidine-4,6-diamine crystallizes from ethanol as a mixed solvate, C13H14N6·0.865C2H6O·0.135N2H4, (I), where the hydrazine has been carried through from the initial preparation. Within the heterocyclic component, the 2-methylphenyl substituent is disordered over two sets of sites. There is an intramolecular C,H...,(arene) hydrogen bond, which may control the molecular conformation of the heterocycle. The heterocyclic molecules are linked by two independent N,H...N hydrogen bonds in a chain containing two types of R22(8) ring. The ethanol component is linked to this chain by a combination of O,H...N and N,H...O hydrogen bonds and the hydrazine component by two N,H...N hydrogen bonds, so generating two R33(9) rings and thus forming a ribbon containing four distinct ring types. [source]

Bis[4-(trimethylammonio)phenyl] disulfide diiodide acetone solvate

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2009
Zheng Zhang
The title compound, C18H26N2S22+·2I,·2C3H6O, is an intermediate in the design of the zwitterionic thiolate 4-(trimethylammonio)benzenethiolate (Tab), in which a pair of aryl-substituted S atoms are linked by a covalent bond. The central S,S bond length is 2.020,(3),Å and the Car,S,S,Car torsion angle is ,84.1,(2)°. The crystal structure is stabilized by nonclassical hydrogen bonds which occur as intramolecular C,H...I interactions and intermolecular C,H...S and C,H...O contacts. In the crystal structure, both the dication and the two symmetrically independent iodide counter-anions are located on twofold crystallographic axes, whereas the acetone solvent molecule occupies a general position. [source]

A structural systematic study of three isomers of difluoro- N -(4-pyridyl)benzamide

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2008
Joyce McMahon
The isomers 2,3-, (I), 2,4-, (II), and 2,5-difluoro- N -(4-pyridyl)benzamide, (III), all with formula C12H8F2N2O, all exhibit intramolecular C,H...O=C and N,H...F contacts [both with S(6) motifs]. In (I), intermolecular N,H...O=C interactions form one-dimensional chains along [010] [N...O = 3.0181,(16),Å], with weaker C,H...N interactions linking the chains into sheets parallel to the [001] plane, further linked into pairs via C,H...F contacts about inversion centres; a three-dimensional herring-bone network forms via C,H...,(py) (py is pyridyl) interactions. In (II), weak aromatic C,H...N(py) interactions form one-dimensional zigzag chains along [001]; no other interactions with H...N/O/F < 2.50,Å are present, apart from long N/C,H...O=C and C,H...F contacts. In (III), N,H...N(py) interactions form one-dimensional zigzag chains [as C(6) chains] along [010] augmented by a myriad of weak C,H...,(arene) and O=C...O=C interactions and C,H...O/N/F contacts. Compound (III) is isomorphous with the parent N -(4-pyridyl)benzamide [Noveron, Lah, Del Sesto, Arif, Miller & Stang (2002). J. Am. Chem. Soc.124, 6613,6625] and the three 2/3/4-fluoro- N -(4-pyridyl)benzamides [Donnelly, Gallagher & Lough (2008). Acta Cryst. C64, o335,o340]. The study expands our series of fluoro(pyridyl)benzamides and augments our understanding of the competition between strong hydrogen-bond formation and weaker influences on crystal packing. [source]

Adducts of bis(acetylacetonato)zinc(II) with 1,10-phenanthroline and 2,2,-bipyridine

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2008
Sanjaya Brahma
In each of the zinc(II) complexes bis(acetylacetonato-,2O,O,)(1,10-phenanthroline-,2N,N,)zinc(II), [Zn(C5H7O2)2(C12H8N2)], (I), and bis(acetylacetonato-,2O,O,)(2,2,-bipyridine-,2N,N,)zinc(II), [Zn(C5H7O2)2(C10H8N2)], (II), the metal center has a distorted octahedral coordination geometry. Compound (I) has crystallographically imposed twofold symmetry, with Z, = 0.5. The presence of a rigid phenanthroline group precludes intramolecular hydrogen bonding, whereas the rather flexible bipyridyl ligand is twisted to form an intramolecular C,H...O interaction [the chelated bipyridyl ligand is nonplanar, with the pyridyl rings inclined at an angle of 13.4,(1)°]. The two metal complexes are linked by dissimilar C,H...O interactions into one-dimensional chains. The present study demonstrates the distinct effects of two commonly used ligands, viz. 1,10-phenanthroline and 2,2,-bipyridine, on the structures of metal complexes and their assembly. [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]

Hydro­gen bonding and C,H,X interactions in 3-fluoro-2-[1-(1-naph­thyl)ethyl]benzoic acid

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 7 2000
Roger E. Gerkin
The title acid, C19H15FO2, crystallized in the centrosymmetric space group P with one mol­ecule as the asymmetric unit. There is a single hydrogen bond, with an OD,OA distance of 2.632,(2),Å and an OD,H,OA angle of 177,(3)°, which forms an R(8) cyclic dimer about a center of symmetry. There is a single leading intermolecular C,H,X interaction, with an H,F distance of 2.49,Å and a C,H,F angle of 147°. Three leading intramolecular C,H,X interactions appear to play a significant role in determining the orientation of the methyl and carboxyl groups. [source]