Isopropenyl benzene

Synonyms AI3-18133 AMS BRN 0969405 CCRIS 6067 EINECS 202-705-0 Isopropenyl-benzene (1-Methylethenyl)benzene 1-Methyl-1-phenylethylene a-Methylstyrol NSC 9400 Ortho brush killer A 2-Phenylpropene P-Phenylpropene 2-Phenylpropylene p Phenylpropylene UN 2303. 

From the decomposition mechanism and the products formed it can be deduced that DCP primarily generates cumyloxy radicals, which further decompose into highly reactive methyl radicals and acetophenone, having a typical sweet smell. Similarly, tert-butyl cumyl peroxide (TBCP) forms large quantities of acetophenone, as this compound still half-resembles DCP. From the decomposition products of l-(2-6 rt-butylperoxyisopropyl)-3-isopropenyl benzene ( ), it can be deduced that the amount of aromatic alcohol and aromatic ketone are below the detection limit (<0.01 mol/mol decomposed peroxide) furthermore no traces of other decomposition products could be identified. This implies that most likely the initially formed aromatic decomposition products reacted with the substrate by the formation of adducts. In addition, unlike DCP, there is no possibility of TBIB (because of its chemical structure) forming acetophenone. As DTBT contains the same basic tert-butyl peroxide unit as TBIB, it may be anticipated that their primary decomposition products will be similar. This also explains why the decomposition products obtained from the multifunctional peroxides do not provide an unpleasant smell, unlike DCP [37, 38]. 

METHYL SILICATE METHYL STYRENE see ISOPROPENYL BENZENE METHYL SULFATE see DIMETHYL SULFATE METHYL SULFIDE see DIMETHYL SULFIDE 2606 681-84-5 ... 

Alpha- Methylstyrene Isopropenyl- Benzene 1-Methyl- 1-phenylethylene Phenylpropylene ... 

That kind of a problem seems to arise in the addition of sec-butyl lithium to di-isopropenyl benzene. The reaction proceeding in benzene was investigated by Rempp et al.407. The investigators intended to develop a dilithio initiator soluble in hydrocarbon. Therefore, they prepared a stoichiometric mixture of the reagents (2 1). Protonation of such a mixture, presumably after cessation of the reaction, yielded butane and the monoadduct,... 

The kinetics of sec-BuLi addition to m-di-isopropenyl benzene was investigated417. However, a large excess of sec-Buli was used in those studies, eliminating the problems of the unfavorable dimerization. Not surprisingly, both C=C bonds reacted under those conditions and were found to be virtually iso-reactive, i.e. the addition of sec-BuLi to one of them did not effect the reactivity of the other. 

ISOPROPENYL BENZENE (98-83-9) Forms explosive mixture with air (flash point 129°F/54°C). Violent reaction with strong oxidizers, butyl lithium, oleum, xenon tetraflu-oride. Unless inhibited, forms unstable peroxides. Incompatible with acids. Reacts with heat and/or lack of appropriate inhibitor concentration, and/or contact with catalysts for vinyl or ionic polymerization, such as aluminum, iron chloride, or 2,5-dimethyl-2,5-di(rert-butylperoxy)hexane. The uninhibited monomer vapor may block vents and confined spaces by forming a solid polymer material. 

SYNONYMS ams, isopropenyl benzene, 1-methyl-1-phenylethylene, 2-phenylpropene, 2-phenylpropylene. 

Synonyms/Trade Names AMS, Isopropenyl benzene, 1-Methyl-1-phenylethylene, 2-Phenyl propylene ... 

Isopropenyl acet at e Isopropenyl benzene / -lsopropenyl I sopropyl benzen / -lsopropenyl st yrene... 

Figure 1.20 Py-GC-MS chromatogram of Kraton 1107 copolymer (a) isoprene, (b) methyl-benzene, (c) isomers of dimethyl benzene, (d)styrene, (e) 1,4-dimethyl-4-ethenyl-cyclohexene, (f) isopropenyl-benzene and (g) l-methyl-4-(l-methylethenyl)-cyclohexene. Reproduced with permission from M. Statheropoulos, K. Mikedi, N. Tzamtzis and A. Pappa, Analytica Chimica Acta, 2002, 461, 215.

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