Bromo crystal structure

Oxetane, 3,3-bis(trimethylaminomethyl)-methane sulfonate X-ray crystal structure, 7, 365 Oxetane, 3-bromo-synthesis, 7, 390 Oxetane, 2-t-butyl-3-methyl-synthesis, 7, 399 Oxetane, 2-chloro-reactions, 7, 390 Oxetane, 3-chloro-synthesis, 7, 390... 

The crystal structure of 2-bromo-l,4-phenylenediyl bis(tran5-4-n-prop-ylcyclohexanoate) was determined by Hartung and Winter [114]. The molecules exhibit pseudo-centrosymmetry in consequence of a special kind of disorder within the crystal lattice. The peculiarity of the crystal structure is the disorder of the molecules with respect to the position of their bromine atoms which occupy the 2- or 5-position of the phenyl ring in a statistical manner. 

Silver(I) complexes are known with the tris(pyrazolyl)borate [HB(pz)3] and the methyl, phenyl, bromo, or trifluoromethyl-substituted derivatives. The structure of the silver tri(pyrazolyl)borato species has been a puzzle since it was first reported.385,386 It was suggested that the structure could be oligomeric, but recently the crystal structure of the compound [Ag HB(3,5-Me2pz)3 ]2 shows that it has a dimeric structure387 where the silver(I) centers are tricoordinated by a bidentate arm of one ligand and a monodentate arm of the other ligand (29). The related complexes [Ag HB(4-Brpz)3 ]2, [Ag HB(4-Mepz)3 ]2, [Ag HB(3,5-Me2pz)3 ]2, [Ag HB(3-Mepz)3 ] , [Ag B(pz)4 ], and... 

Only one bicyclic peroxide was obtained for each ring system and for 26 and 27 we confirmed that the bromide is cis to the peroxide linkage. In the [2,2.1]-compound this was established from its H n.m.r. spectrum by the absence of long range W-plan coupling for the CHBt proton. The cw-configuration of the [3.2.1] compound was indicated by the lH n.m.r. spectrum of the 2-bromo-3-butoxy-cyclohexanol obtained quantitatively upon reaction with butyllithium (Eq. 24), and has now been confirmed by an X-ray crystal structure determination39). 

Figure 5 shows the crystal structures of 4-chloro, 4-bromo, 4-iodo and 4-carbomethoxy-l-cubane car-... 

Figure 5. Crystal structures of 4-chloro-1 -cubanecarboxylic acid (top left), 4-bromo-1-cubanecarboxylic acid (bottom left), 4-iodo-1-cubanecarboxylic acid (top right) and 4-carbomethoxy-1-cubanecarboxylic acid (bottom right) to show the layer with zig-zag arrangement of synthon VIII.

In an effort to prepare bidentate boranes as colorimetric anion sensors, the incorporation of chromophoric boron moieties has also received attention. Reaction of lO-bromo-9-thia-lO-boranthracene 33 with dimesityl-1,8-naphthalenediylborate 26 affords diborane 34 (Scheme 14). This bright yellow diborane is soluble in chloroform, THF and pyridine. It has been fully characterized but its X-ray crystal structure could not be determined experimentally. Its structure was computationally optimized using DFT methods (B3LYP, 6-31 + G for the boron and sulfur... 

Experimental studies delineating an extensive number of chemical transformations of laurenene (532) 12.336) including the crystal structure analysis of a bromo derivative have teen published. 

Full papers on the crystal structures of echinocystic acid diacetate bromo-lactone and papyrogenin have appeared. The structure of 3/3,16)3-... 

The X-ray crystal structure determinations of thieno[2,3-c]pyridine imines, 38, have been carried out. When the imine contains weak donor and acceptor groups, as in the thioether derivative, the compound is twisted however, the analogous bromo compound is planar <1998J(P2)437>. 

The oxidation of phenols forming aryloxyl radicals was first recognized by Pummerer and Frankfurter in 1914," who reacted 2,2 -dihydroxy-l,l -binaphthyl with ferricyanide, and isolated dimers and trimers of the radical 20 (equation 8), which was later observed by ESR." Many further examples were studied by Goldschmidt, Muller, and others," and an X-ray crystal structure confirmed dimer formation with C—O bonding at the 4-position for 3-bromo-2,4,6-triphenylphenoxyl. ... 

The X-ray crystal structures of the related, though less complex, anticrown mercury-containing macrocycles 45 and 46 have also recently been reported. Complex 45 may form either 1 1 complexes with Br or I" or a 3 2 complex with Cr. In the case of the bromo derivative, crystallographic results reveal an infinite chain of alternating Br and 45 with each halide bridging between six Hg atoms, Hg- Br 3.07-3.39 A. It is postulated that the related 3 2 chloride complex exhibits a similar, though finite layered structure. The related pentameric species 46 forms... 

The dimer 29 of the dihydronaphthylmethylidenecyclopropane 30 was formed at a surprisingly low temperature (— 90 °C), when the bromo derivative 28 was treated with terf-butyllithi-um in tetrahydrofuran.62 The E configuration of the dispiro[2.0.2.2]octane derivative was proved by X-ray crystal structure analysis. Similar dimerizations of 1-donor-substituted allyli-dcnccyclopropanes have been observed at + 50 C.63... 

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