Caesium iodide, reaction

Chapman and co-workers have reported the direct spectroscopic observation of benzocyclobutadiene itself by reaction of cis-1,2-di-iodobenzocyclobutene with zinc powder at 230 °C. Initial cooling of the resultant vapour deposited a mixture of dimeric material and traws-l,2-di iodobenzocyclobutene. The benzocyclobutadiene was trapped in an argon matrix at 20 K on either a caesium iodide or a sapphire plate for spectroscopic examination. The infrared spectrum showed a band at 700 cm which is probably due to one of the C—H bond deformations of the four-membered ring. The ultraviolet spectrum showed at 243, 246.5,256, 270, 281.5, and 289 nm. On warming above 75 K, the known benzocyclobutadiene dimer (150) was formed and identified by comparison with authentic material. 

Bowsher, B. R., Dickinson, S. The interaction of caesium iodide with boric acid Vapour phase and vapour-condensed phase reactions. Report AEEW-R 2102 (1986)... 

Bowsher, B. R., Henshaw, J. G., Newland, M. S. The kinetics of reaction between iodine vapour and bulk-material aerosols. Proc. 3. CSNI Workshop on Iodine Chemistry in Reactor Safety, Tokai-mura, Japan, 1991 Report JAERI-M 92-012 (1992), p. 165-180 Bowsher, B. R., Nichols, A. L. High-temperature studies of simulant fission products. Part IV Interaction of caesium iodide with boric acid over the temperature range 400 to 1000 °C. Report AEEW-R 1973 (1985)... 

Bums, W. G., Kent, M. C., Marsh, W. R., Potter, P. E., Sims, H. E. Radiolytic and surface reactions of dilute iodine solutions. Proc. 2. CSNI Workshop on Iodine Chemistry in Reactor Safety, Toronto, Can., 1988 Report AECL-9923 (1989), p. 19-38 Bums, W. G., Kent, M. C., Marsh, W. R., Sims, H. E. The radiolysis of aqueous solutions of caesium iodide and caesium iodate. Report AERE-R-13520 (1990)... 

In their review of the classification of donors and acceptors in inorganic reactions, Williams and Hale (7) pointed out that for reactions in water, class (a) character was exhibited most strongly by lithium and least by caesium, which was indeterminate between classes (a) and (b). Here class (a) character means that the fluoride is more stable in water than the iodide. In general Group IA metals prefer hard ligands, F, O, N their interaction with sulphur and carbon is considered in para. IV. 

The reaction between dry phosphine and hydrogen iodide, first described in 1817 by J. J.Houtonde la Billardiere produces phosphonium iodide. The simplest laboratory preparation of this compound is by the hydrolysis of an intimate mixture of diphosphorus tetraiodide and white phosphorus According to X-ray diffraction investigations, phosphonium iodide crystallises in a caesium chloride type lattice 3m,32s). 326) hydrogen atoms... 

The coupling of secondary phosphines with aryl iodides was also extended to pyridines. 3-Iodopyridine and diphenylphosphine were coupled to give 3-diphenylphosphino-pyridine in 60% yield (7.80.), The catalyst in this reaction consisted of copper(I) iodide and N,N -dimethylethylenediamine and caesium carbonate was used again as base.102... 

Place the caesium carbonate (31.3 g), caesium toluenesulfonate (3.65 g) and tetrabutylammonium iodide (1.13 g) in the reaction vessel through a powder funnel and then pour dry DMF (800 mL) through the same funnel. Degas the resulting suspension with a flow of nitrogen for 15 min. Transfer the nitrogen supply to the bubbler, so that the gas is flowed over the reaction mixture. 

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