Potassium ZerZ.-BUTOxiDE

The sodium methoxide was obtained from Matheson, Coleman and Bell Co. The submitters carried out all operations with this reagent in a dry-box under a stream of dry nitrogen. Sodium ethoxide and potassium ZerZ-butoxide have been successfully substituted for sodium methoxide 2 the choice of sodium methoxide is here principally one of convenience. With other olefins, the choice of alkoxide depends upon the boiling points of the dichlorocarbene adduct and the corresponding dialkyl carbonates. 

The dehydrohalogenation products of poly(ethylene-a/z-chlorotrifluor-oethylene) were also studied using solid-state NMR spectroscopy and the cross-polarization magic angle spinning (CP MAS) technique [18]. The elimination reaction induced by potassium ZerZ-butoxide (z-BuOK) in tetrahydrofuran (THF) was found to proceed slowly only 50% of hydrogen... 

The NMR results along with the IR spectroscopic data have shown that chemical dehydrohalogenation of poly(ethylene-aZz-chlorotrifluor-oethylene), by treating with potassium zerz-butoxide in THF, mainly yields halogen-substituted polyenyne structures containing randomly distributed isolated triple C=C-bonds. Based on the predominant structure of the original polymer, the polyene fragments can be described as head-to-head poly fluoro vinylenes (Scheme 12.8). 

A previous metiiod [1] of prepariug 3,3-dimethyIbutyue by dehydrochloriuatiou of the title compoimd iu a sodium hydroxide melt is difficult to coutrol aud hazardous ou the large scale. Use of potassium ZerZ-butoxide as base iu DMSO is a high-yieldiug, safe aud couveuieut alteruative method of preparatiou of the alkyue [2]. See Dimethyl sulfoxide Metal alkoxides... 

Potassium Zert-butoxide See Potassium ZerZ-butoxide Acids, etc. 

Potassium ZerZ-butoxide See Potassium Zerf-butoxide Acids... 

Bis(2,4-pentanedionato)chromium, 3326 Molybdenum hexamethoxide, 2596 Potassium ZerZ-butoxide, 1650 Potassium ethoxide, 0861 Potassium methoxide, 0450... 

A chilled (—35°C) solution of commercial potassium ZerZ-butoxide (1.95 g, 17.4 mmol) in 20 mL THF is added to a suspension of anhydrous copper(I) iodide (3.00 g, 15.79 mmol) in 25 mL of THF. The mixture is stirred overnight at room temperature. The resulting solution is then filtered through Celite to remove the precipitated KI followed by removal of all volatiles from the filtrate in vacuo to give a brown-yellow residue. Addition of ca. 5 mL of cold pentane allows the isolation of a pale yellow solid from this residue by filtration and dried in vacuo to afford 1.69 g (78%) of pale yellow copper(I) ZerZ-butoxide. 

Oxabicyclo[4.1.0]hept-3-enes with a bromo substituent in position 2 can be converted to oxepins 11 by reaction with an appropriate base such as potassium ter+butoxide or triethylamine (see the experimental procedures for the preparation of the parent system in Houben-Weyl, Vol. 6/ld, pi78 and Vol. 6/4, p462).12,156,157 Usually the reaction products are mixtures of oxepin 11 and benzene oxide 12. In the case of ZerZ-butyl 7-oxabicyclo[4,1.0]hept-3-ene-2-carboxylate, the equilibrium lies completely on the benzene oxide side 12a.158... 

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