Showing papers by "Chizuko Kabuto published in 1987"
TL;DR: In this article, a nouvelle dimerisation des alcynes, a partir de dodecamethyltetraoxahexasilacyclotetradecadiyn and Fe 2 (CO) was proposed.
Abstract: Preparation et structure d'un premier complexe fer-methylenecyclopropene par une nouvelle dimerisation des alcynes, a partir de dodecamethyltetraoxahexasilacyclotetradecadiyn et Fe 2 (CO) 9
37 citations
23 citations
TL;DR: The crystal structure of TTF·BTDA-TCNQ complex was determined by an X-ray diffraction method as discussed by the authors, which is not a simple CT complex with mixed stacks but rather the one with some inclusion behavior.
Abstract: The crystal structure of TTF·BTDA–TCNQ complex was determined by an X-ray diffraction method. The crystals are monoclinic, space group P21⁄n with a=9.660(1), b=7.231(1), c=14.628(2) A, β=91.31(1)°, and Z=2. The structure was solved by the direct method and refined by the block-diagonal least-squares method to give an R value of 0.040 for non-zero 2620 reflections. The complex is nonionic and the molecules form equally spaced mixed stacks along the b axis. These stacks are connected by strong transverse interactions resulting in a three-dimensional structure. BTDA–TCNQ molecules make cavities by S–N≡C interactions in which TTF molecules are included. This complex is not a simple CT complex with mixed stacks but rather the one with some inclusion behavior.
18 citations
TL;DR: In this paper, the stereoselective synthesis of dl -siccanin (1) and dl-siccanene E (2) has been described, and a novel tetrahydrofuran formation by a neighboring participation, which was observed in hydroxy ketone 24 and diol 32, are also discussed.
16 citations
TL;DR: Z-1,2-Bis(t-butyldimethylsilyl)-1-2-bis(trimethyl silyl)ethylene was prepared by X-ray crystallography as mentioned in this paper.
Abstract: Z-1,2-Bis(t-butyldimethylsilyl)-1,2-bis(trimethylsilyl)ethylene was prepared, the structure being determined by X-ray crystallography. Remarkably, the compound is fixed to cis configuration and a considerable pyramidarization occurs at olefinic carbons with large twisting of the double bond.
11 citations
TL;DR: In this paper, the absolute configuration of the resolved exo complex was determined by single crystal X-ray diffraction analysis, which was then applied to establish the endo isomer (−)- 3.
11 citations
TL;DR: In this paper, the title electron acceptors, TSDA (2) and BSDA (3), were prepared which crystallize isomorphously with the sulfur analogue, BTDA (1).
Abstract: The title electron acceptors, TSDA (2) and BSDA (3), were prepared which crystallize isomorphously with the sulfur analogue, BTDA (1). The molecular interactions are enhanced in 2 and 3 compared with 1, which connect the molecules to form two-dimensionally expanded “sheet-like” networks and their infinite layers.
11 citations
TL;DR: Optical resolution of (±)-tricarbonyl(2,3-dihydrotropone)iron was carried out, and the absolute configuration was determined by X-ray diffraction and CD spectroscopic studies as mentioned in this paper.
10 citations
TL;DR: In this paper, a two-dimensional "ribbonbone dimer" network was constructed by strong Se-Se and Se-N interactions in the crystal of the crystal lattice.
Abstract: The title compound was prepared which forms a two-dimensional “ribbon dimer” network by strong Se–Se and Se–N interactions in the crystal.
8 citations
TL;DR: Refluxing a mixture of 3-cyanoindolizine and dimethyl acetylenedicar☐ylate in toluene affords a 1:2 adduct, the structure of which is unambiguously determined by an X-ray analysis as discussed by the authors.
7 citations
TL;DR: In this paper, the crystal structure of the title salt was determined by X-ray analysis and columnar stacks of anion radicals were formed along the c axis, in which quinone molecules are not spaced equally but forming dyads with short contacts between sulfur atoms.
Abstract: Crystal structure of the title salt was determined by the X-ray analysis. Segregated columnar stacks of anion radicals are formed along the c axis, in which quinone molecules are not spaced equally but forming dyads with short contacts between sulfur atoms.
TL;DR: In this paper, the stereoselective synthesis of dl -siccanin (1) and dl-siccanene E (2) has been described, and a novel tetrahydrofuran formation by a neighboring participation, which was observed in hydroxy ketone 24 and diol 32, are also discussed.
Abstract: The stereoselective synthesis of dl -siccanin (1) and dl -siccano-chromene E (2) has been described. Acid isomerization of nonconjugated octalone 11a, derived from known octalone 5, stereoselectively provided cis-fused octalone 12, from which cis -drimane aldehyde 31 was obtained. After condensation of 31 with lithio-orcinol dimethyl ether, the product 32 was treated with pyridinium chloride to give tetrahydrofuran 33 whose complete stereostructure was unambiguously established by an X-ray crystal analysis. While cyclization of monophenol 34, obtained by partial demethylation of 33, with sulfuric acid afforded siccanochromene E methyl ether (35), reaction of 34 with Lewis acid gave siccanin methyl ether (36) along with 35. In the latter cyclization, the formation of 36 was demonstrated to occur from initially formed 35. Finally, demethylation of 35 and 36 provided 2 and 1, respectively. A novel tetrahydrofuran formation by a neighboring participation, which was observed in hydroxy ketone 24 and diol 32, are also discussed.