Reversible carbon–nitrogen bond formation in the isomerisation of triosmium compounds derived from t-butyldiazomethane (ButCHN2); the X-ray crystal structure of [Os3H2(ButCHNNCO)(CO)8(PMe2Ph)]

1986 ◽  
pp. 2259-2264 ◽  
Author(s):  
Antony J. Deeming ◽  
Yoshio Fuchita ◽  
Kenneth Hardcastle ◽  
Kim Henrick ◽  
Mary McPartlin
Keyword(s):  
Crystal Structure ◽  
Bond Formation ◽  
X Ray ◽  
Nitrogen Bond

scholarly journals Uncovering the chemistry of C–C bond formation in C-nucleoside biosynthesis: crystal structure of a C-glycoside synthase/PRPP complex

2020 ◽  
Vol 56 (55) ◽  
pp. 7617-7620 ◽  
Author(s):  
Sisi Gao ◽  
Ashish Radadiya ◽  
Wenbo Li ◽  
Huanting Liu ◽  
Wen Zhu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Bond Formation ◽  
Biologically Active ◽  
X Ray

X-Ray crystal structure of a novel C-glycoside synthase involved in the biosynthesis of biologically active C-nucleosides and C-nucleotides.

The crystal structure and chemistry of the "red salt" α-trisilver-amidoselenate, Ag3NSeO3

1990 ◽  
Vol 68 (9) ◽  
pp. 1606-1610 ◽  
Author(s):  
Vladimir Kocman ◽  
Jan T. Szymański
Keyword(s):  
Crystal Structure ◽  
Structural Unit ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Threefold Axis ◽  
X Ray ◽  
Dimensional Network ◽  
Crystal Structure And Chemistry ◽  
Silver Atoms ◽  
Nitrogen Bond

The crystal structure of the α-modification of the "red salt" of trisilver amidoselenate, Ag3NSeO3 has been determined from MoKα X-ray diffraction data, and refined to R = 3.19% from 337 unique absorption-corrected observed reflections. The structure is rhombohedral, R3c (No. 161), with (hexagonal) a = 8.462(4), c = 11.372(6) Å. The formula unit has point symmetry 3 (C3), with Se and N on the threefold axis, each approximately tetrahedrally coordinated; Se by three oxygen atoms (at 1.651(8) Å and N (at 1.70(2) Å, and N by Se and three silver atoms (at 2.164(8) Å. The bond of 1.70(2) Å between Se and N is particularly short. The Ag3NSeO3 structural unit bridges to three adjacent units via short Ag … O contacts of 2.23(1) Å to form a three-dimensional network. Keywords: trisilver amidoselenate, selenium–nitrogen bond, X-ray structure.

scholarly journals An unusual thionyl chloride-promoted C−C bond formation to obtain 4,4'-bipyrazolones

2018 ◽  
Vol 14 ◽  
pp. 1287-1292 ◽  
Author(s):  
Gernot A Eller ◽  
Gytė Vilkauskaitė ◽  
Algirdas Šačkus ◽  
Vytas Martynaitis ◽  
Ashenafi Damtew Mamuye ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Thionyl Chloride ◽  
Alkaline Hydrolysis ◽  
Bond Formation ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
Spectroscopic Investigations

Dialkyl 5,5'-dioxo-4,4'-bipyrazole-4,4'-dicarboxylates are readily obtained by the reaction of 5-hydroxypyrazole-4-carboxylates in refluxing thionyl chloride. The obtained diesters can be transformed into the corresponding 4,4'-bipyrazoles via alkaline hydrolysis and subsequent decarboxylation. Detailed NMR spectroscopic investigations (1H, 13C, 15N) were undertaken with all products prepared. Moreover, the structure of a representative 5,5'-dioxo-4,4'-bipyrazole-4,4'-dicarboxylate was confirmed by X-ray crystal structure analysis.

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