Catalysis of diene polymerization and Diels-Alder reactions by an octahedral tungsten nitrosyl Lewis acid. X-ray crystal structure of the .eta.1-acrolein complex (cis-Me3P)(trans-NO)(CO)3WO:C(H)C(H):CH2

1987 ◽  
Vol 52 (23) ◽  
pp. 5293-5296 ◽  
Author(s):  
Robert V. Honeychuck ◽  
Peter V. Bonnesen ◽  
Judah Farahi ◽  
William H. Hersh
Keyword(s):  
Crystal Structure ◽  
Lewis Acid ◽  
Diels Alder ◽  
X Ray

scholarly journals First Total Synthesis and Investigation of the X-ray Crystal Structure of the Pyrano[3,2-a]carbazole Alkaloid Clausenalansine A

Synthesis ◽  
2020 ◽  
Vol 53 (02) ◽  
pp. 359-364
Author(s):  
Hans-Joachim Knölker ◽  
Valerie Lösle ◽  
Olga Kataeva
Keyword(s):  
Crystal Structure ◽  
Total Synthesis ◽  
Lewis Acid ◽  
Oxidative Cyclization ◽  
Formyl Group ◽  
Pyran Ring ◽  
X Ray ◽  
Synthetic Strategy

AbstractWe describe the first total synthesis of the recently discovered pyrano[3,2-a]carbazole alkaloid clausenalansine A. The synthetic strategy for the construction of this formylpyrano[3,2-a]carbazole is based on a sequence of Buchwald–Hartwig coupling, palladium(II)-catalyzed oxidative cyclization, Lewis acid promoted annulation of the pyran ring, and chemoselective oxidation of a methyl to a formyl group.

ChemInform Abstract: Abnormal Diels-Alder Reaction of 5-Alkoxyoxazoles with Tetracyanoethylene and X-Ray Crystal Structure of an Adduct.

ChemInform ◽  
2010 ◽  
Vol 23 (44) ◽  
pp. no-no
Author(s):  
T. IBATA ◽  
Y. ISOGAMI ◽  
H. NAKAWA ◽  
H. TAMURA ◽  
H. SUGA ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Alder Reaction ◽  
Diels Alder ◽  
X Ray ◽  
Diels Alder Reaction

Coordination compounds of indium. Part 43. Indium(III) derivatives of benzenethiol, and the crystal structure of tetraphenylphosphonium bromotris(benzenethiolato)- indate(III), Ph4P[BrIn(SPh)3]

1987 ◽  
Vol 65 (4) ◽  
pp. 804-809 ◽  
Author(s):  
Raj K. Chadha ◽  
Peter C. Hayes ◽  
Hassan E. Mabrouk ◽  
Dennis G. Tuck
Keyword(s):  
Crystal Structure ◽  
Lewis Acid ◽  
Vibrational Spectra ◽  
Coordination Compounds ◽  
Monoclinic Space Group ◽  
Tetrahedral Symmetry ◽  
X Ray ◽  
Cell Dimensions ◽  
Derivatives Of ◽  
Ray Methods

In(SPh)3 is readily prepared by the reaction of InCl3 and NaSPh in methanol. The compound is a Lewis acid, forming 1:1 adducts with 2,2′-bipyridine, 1,10-phenanthroline, N,N,N′,N′-tetramethylethanediamine, bis(diphenylphosphino)ethane, and dimethylsulphoxide, and 1:2 adducts with pyridine, trimethylamine, and triphenylphosphine. Reaction with R4NX (X = Cl, Br, I) or similar salts gives R4N[XIn(SPh)3] salts, which are 1:1 electrolytes. The structure of Ph4P[BrIn(SPh)3] has been determined by X-ray methods. The crystals are monoclinic, space group P21/c, with cell dimensions a = 9.964(3) Å, b = 13.477(3) Å, c = 30.359(7) Å, α = 98.30(2)°, Z = 4, R = 0.0622 for 2924 unique observed reflections. The anion has distorted tetrahedral symmetry in the InBrS3 kernel, with In—Br = 2.527(2) Å, and In—S(av) = 2.450 Å. The vibrational spectra of In(SPh)3 and its derivatives in the region 500–200 cm−1 are discussed.

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