3.4- diacyl-2,5-dialkyl

This is basically the same type of induced decomposition that occurs with other peroxide classes, eg, the dialkyl peioxydicaibonates and diacyl peroxides. Table 8. Commercial rerf-Alkyl Hydroperoxides ... 

Organic peroxides can be classified according to peroxide stmcture. There are seven principal classes hydroperoxides dialkyl peroxides a-oxygen substitued alkyl hydroperoxides and dialkyl peroxides primary and secondary ozonides peroxyacids diacyl peroxides (acyl and organosulfonyl peroxides) and alkyl peroxyesters (peroxycarboxylates, peroxysulfonates, and peroxyphosphates). 

Acyl peroxides of structure (20) are known as diacyl peroxides. In this structure and are the same or different and can be alkyl, aryl, heterocychc, imino, amino, or fiuoro. Acyl peroxides of stmctures (21), (22), (23), and (24) are known as dialkyl peroxydicarbonates, 00-acyl O-alkyl monoperoxycarbonates, acyl organosulfonyl peroxides, and di(organosulfonyl) peroxides, respectively. and R2 ia these stmctures are the same or different and generally are alkyl and aryl (4—6,44,166,187,188). Many diacyl peroxides (20) and dialkyl peroxydicarbonates (21) ate produced commercially and used ia large volumes. 

The NOBS system undergoes an additional reaction that forms a diacyl peroxide as a result of the nucleophilic attack of the peracid anion on the NOBS precursor as shown in equation 21. This undesirable side reaction can be minimized by the use of an excess molar quantity of hydrogen peroxide (91,96) or by the use of shorter dialkyl chain acid derivatives. However, the use of these acid derivatives also appears to result in less efficient bleaching. The dependence of the acid group on the side product formation is apparentiy the result of the proximity of the newly formed peracid to unreacted NOBS in the micellar environment (91). A variety of other peracid precursor stmctures can be found (97—118). 

Furoxans, bis[(acetoxyalkyl)carbonyl]-synthesis, 6, 421 Furoxans, bisarylsulfonyl-synthesis, 6, 423 Furoxans, bis(dialkylamino)-synthesis, 6, 414 Furoxans, butylhexynyl-synthesis, 6, 423 Furoxans, decamethylenering cleavage, 6, 405 Furoxans, diacyl-thermolysis, 6, 81 synthesis, 6, 442 Furoxans, diadamant-1-yl-ring cleavage, 6, 404 Furoxans, dialkoxycarbonyl-synthesis, 6, 423 Furoxans, dialkyl-synthesis, 6, 423 Furoxans, diaryl-ozonolysis, 6, 405 Furoxans, diaroyl-isoxazoles from, 6, 82 Furoxans, dibenzoyl-synthesis, 6, 423 Furoxans, diethoxycarbonyl-synthesis, 6, 423... 

Isoxazole, 3-chloro-5-hydroxymethyl-oxidation, 6, 27 Isoxazole, 4-chloromethyI-reactions, 6, 53 Isoxazole, 5-chloro-3-phenyl-reactions, 6, 58 Isoxazole, 3-cyano-reactions, 6, 30 Isoxazole, diacyl-synthesis, 6, 79 Isoxazole, 3,4-dialkyl-synthesis, 6, 83 Isoxazole, 3,5-dialkyl-synthesis, 6, 83 Isoxazole, 4,5-dialkyl-synthesis, 6, 83 Isoxazole, 3,5-diamino-2-amino-l-azirines from, 7, 89 Isoxazole, 3,5-diaryl-synthesis, 6, 63 Isoxazole, 2,5-dihydro-synthesis, 6, 79 Isoxazole, 4,5-dihydro-dehydrogenation, 6, 4... 

Many types of peroxides (R-O-O-R) are known. Those in common use as initiators include diacyl peroxides (36), pcroxydicarbonatcs (37), peroxyesters (38), dialkyl peroxides (39), hydroperoxides (40), and inorganic peroxides [e.g. persulfate (41)1, Multifunctional and polymeric initiators with peroxide linkages are discussed in Sections 3.3.3 and 6.3.2.1. 

Diboran reduziert offenkettige 1,2-Diacyl-hydrazine in Bis-[2-methoxy-athyl]-ather auch mit 50%igem OberschuB erst bei 130-135° in guten Ausbeuten zu den entsprechen-den 1,2-Dialkyl-hydrazinen. Als Nebenreaktion kann die Spaltung der N,N-Bindung auftreten (s. S. 484). 

Dialkyl- 1,2-diacyl-hydrazine, selbst Benzoyl-Derivate, lassen sich dagegen bereits in siedendemTHFgutzu den Tetraalkyl-hydrazinenreduzieren. In geringemUmfang konnen sich auch Monoacyl-hydrazine und Amine bilden. So erhalt man z. B. aus 1,2-Dimethyl- 1,2-dipropanoyl-hydrazin neben 82% d.Th. 1,2-Dimethyl-1,2-dipropyl-hydrazin 14% d.Th. 1,2-Dimethyl-2-propyl-l-propanoyl-hydrazin1 bzw. aus 1,2-Dimethyl-1,2-di-benzoyl-hydrazin neben 60% d.Th. 1,2-Dimethyl-1,2-dibenzyl-hydrazin 28% d.Th. Methyl-benzyl- amin1. 

Thermal decomposition of dialkyl peroxides, diacyl peroxides, hydroperoxides and peracids depending on the structure of the peroxidic compound occurs in a measurable rate usually above 60°C. Diacyl peroxides and peracids are considerably less stable than dialkyl peroxides and hydroperoxides. 

Diacyl peroxides exhibit behavior somewhat like that of the dialkyl peroxides. Benzoyl, peroxide decomposes into radicals partly by a unimolecular and partly by a chain mechanism. In at least the case of benzoyl peroxide itself, if not for similar compounds, the first step is the production of benzoyloxy radicals rather than phenyl radicals and... 

Work on the deflagration hazards of organic peroxides has been done using a revised Time-Pressure test, to determine the characteristics of ignition sensitivity and violence of deflagration. Some correlation is evident between these characteristics and the AO content within each structurally based peroxide type. Also, for the same AO content, the nature of the characteristics appears to decrease hi the order diacyl peroxides, peroxyesters, dialkyl peroxides, alkylhydroperoxides [18],... 

CYCLIC PEROXIDES, DIACYL PEROXIDES DIALKYL PEROXIDES, Z, /-DI(BENZOYLPEROXY)ARYLIODINES DIFLUOROAMINO COMPOUNDS, DIFLUOROAMINOPOLYNITROAROMATIC COMPOUNDS... 

At increased temperatures, the peroxide bond is cleaved homolytically, giving radicals. Dibenzoyl peroxide is a diacyl peroxide and cleaves rather more readily than the dialkyl peroxide, but further decomposition then occurs in which carbon dioxide... 

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