Dibenzoyl 490 -acetone

Dimethyl peroxide Diethyl peroxide Di-t-butyl-di-peroxyphthalate Difuroyl peroxide Dibenzoyl peroxide Dimeric ethylidene peroxide Dimeric acetone peroxide Dimeric cyclohexanone peroxide Diozonide of phorone Dimethyl ketone peroxide Ethyl hydroperoxide Ethylene ozonide Hydroxymethyl methyl peroxide Hydroxymethyl hydroperoxide... 

Lobelanidine, C22ll2g02N. Crystallises from alcohol in laminae, m.p. 150°, [ ] D i 0°, distils unchanged in a vacuum and is readily soluble in acetone or benzene, sparingly so in ether. The hydrochloride, m.p. 135-8°, forms needles from alcohol the hydrobromide has m.p. 188-190°. The dibenzoyl derivative melts at 109-10° and the hydrochloride of the diacetyl derivative at 214-5°. The methiodide becomes tiu-bid at 178-5° and clears at 200°. Phosphorus trichloride converts the base into dichlorolobelane... 

Dimethyl peroxide Diethyl peroxide Di-t-butyl-di-peroxyphthalate Difuroyl peroxide Dibenzoyl peroxide Dimeric ethylidene peroxide Dimeric acetone peroxide Dimeric cyclohexanone peroxide Diozonide of phorone Dimethyl ketone peroxide Ethyl hydroperoxide Ethylene ozonide Hydroxymethyl methyl peroxide Hydroxymethyl hydroperoxide 1-Hydroxyethyl ethyl peroxide 1 -Hydroperoxy-1 -acetoxycyclodecan-6-one Isopropyl percarbonate Isopropyl hydroperoxide Methyl ethyl ketone peroxide Methyl hydroperoxide Methyl ethyl peroxide Monoperoxy succinic acid Nonanoyl peroxide (75% hydrocarbon solution) 1-Naphthoyl peroxide Oxalic acid ester of t-butyl hydroperoxide Ozonide of maleic anhydride Phenylhydrazone hydroperoxide Polymeric butadiene peroxide Polymeric isoprene peroxide Polymeric dimethylbutadiene peroxide Polymeric peroxides of methacrylic acid esters and styrene... 

Dissociation of 1,1,4,4-tetrapheny 1-2,3- dibenzoyl-tetrazane into radicals in chloroform, acetone, ether, and toluene.464 90s... 

A 50-ml Schlenk tube containing a stirrer bar was charged with 3.4 ml of toluene, vinyl acetate (71 mmol), tris(2,2,2-trifluorethyl) phosphite (0.36 mmol), and dibenzoyl peroxide (0.18 mmol) successively at 60°C. The reaction mixture was then stirred in the closed Schlenk tube at 70°C for 2 hours and then treated with bis(ally-loxy)methane (3.56 mmol) and stirred at 70°C for 20 hours. All volatile components were then removed using an oil pump vacuum. The polymer was dissolved in acetone and then precipitated in heptane and 1.78 g product isolated as a white powder. 

Benzodioxines. The reaction of benzo-l,4-dioxanes with NBS catalyzed by dibenzoyl peroxide results in 2,3-dibromo derivatives, which undergo denomination to benzo-l,4-dioxines when treated with sodium iodide in acetone (equation I).1... 

The acetonation of 1,6-dibenzoyl-D-mannitol, using a concentrated sulfuric acid catalyst, gives only the 3,4-derivative, even when excess acetone is employed.31-181 Under similar conditions l,6-dichloro-l,6-didesoxy-D-mannitol affords the 3,4-derivative as well as two isomeric 2,3,4,5-ketals.119... 

Up to about the 1960 s, elemental analysis coupled with absorption spectra and infrared spectra and X-ray crystallography were the primary methods used in the studies of complexes. Later on with the developments in nuclear magnetic resonance (NMR) spectroscopy, especially multinuclear NMR, this technique has been invariably used in the studies of structural features of lanthanide complexes. To illustrate these points some references to literature are herein pointed out. The studies on the rare earth 1,3-diketonates, where 1,3-diketones are acetyl acetone, benzoyl acetone, dibenzoyl methane and 2-thienoyl tri-fluoroacetone totally relied on elemental analysis, UV-Vis and IR spectra to establish the nature of the complexes [89]. The important role played by X-ray crystallography in the elucidation of the structures of lanthanide complexes has been extensively discussed in Chapter 5 and the use of this technique goes as far back as the 1960 s. Nevertheless it continues to play a major role in the studies of lanthanide complexes. 

The benzene or substituted benzene emissions may change to enhanced absorptions and the phenylbenzoate absorptions may change to emissions if dibenzoyl peroxides are irradiated in solutions containing such added effective triplet sensitizers, as Michler s ketone, 2-acetonaphthone, 1 -acetonaphthone, acetophenone, benzophenone, acetone and cyclohexanone An example... 

The corresponding iodide is prepared in a similar manner to the bromide. It may be crystallised from benzene or acetone and melts at about 80° C. It is more readily decomposed than the bromide, and hydrochloric or acetic acids break it down to allyl alcohol and mercuric salts. The presence of the two hydroxyl groups has been shown by the fact that the iodide yields a dibenzoyl derivative, M.pt. 100° C. When the iodide is treated with iodine at 40° C. a liquid iodohydrine is obtained. 

Di(m-chlorobenzoyl) Peroxide, crysts (from hydrocarbon solvs), mp 123° dec was prepd by reaction 3-chlorobenzoyl chloride in dry toluene with an excess of aq Na202 (Ref 4) Di(p-chlorobenzoyl) Peroxide, crysts (from CS2), mp 142° dec explodes in a steel bomb when heated to 180° giving 4-4-dichlorodiphenyl, 4-chlorobenzoic acid, CO2 other products more sensitive to impact friction than Dibenzoyl Peroxide was prepd by reacting 4-chlorobenzoyl chloride in acetone with either 5% H2O2 25% NaOH below 6° or a soln of Na202 in ice water (Refs 1 2)... 

Benzoyl disulfide (dibenzoyl disulHde) [644-32-6] M 174.4, m 131.2-132.3. About 300mL of solvent is blown off from a filtered solution of dibenzoyl disulfide (25g) in acetone (350mL). The remaining acetone is decanted from the solid which is recrystallised first from 300mL of 1 1 (v/v) EtOH/ethyl acetate, then from 300mL of EtOH, and finally from 240mL of 1 1 (v/v) EtOH/ethyl acetate. The yield is about 40% [Pryor Pickering J Am Chem Soc 84 2705 1962]. [Beilstein 9 H 424, 9 II 289, 9 III 1977.] Handle in a fume cupboard because o/TOXICITY and obnoxious odour. 

Neutral dibenzoyl-rf-tartrate, (CjjHyNjOjJj.C-.HiaO,. crystals from alcohol or acetone, dec 166-167. Mb +3-7 <4 1 alcohol + chloroform). 

Very reactive substances are treated with NBS alone, but in other cases a radical-former is added. The favored radical activator for bromination of olefins by NBS is 2,2/-azoisobutyronitrile, 1 part per 100-1000 parts of NBS. This nitrile is obtained by reaction of bromine water with 2,2 -hydrazoiso-butyrodinitrile, which is prepared from acetone, KCN, and hydrazine sulfate in warm water365 (see also Dox366). The decomposition temperature of dibenzoyl peroxide is higher than that of 2,2 -azoisobutyrodinitrile, and about 30° above the boiling point of CC14. 

Lobelanidine, C22H2902N, which accompanies lobeline and lobelanine, is also a tertiary and monoacidic base. It ciystallizes from ethanol as colorless prisms, m.p. 150°, is readily soluble in acetone, benzene, and pyridine, less soluble in cold ethanol, sparingly in ether and petroleum ether, and insoluble in water. The base forms crystalline salts and derivatives a hydrochloride melting at 138°, a hydrobromide, m.p. 188-190°, a diacetyl derivative, the acetate of which melts at 75°, and a dibenzoyl... 

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