2.5.5- Trimethyl-2,3-hexadiene

Catalytic forms of copper, mercury and silver acetylides, supported on alumina, carbon or silica and used for polymerisation of alkanes, are relatively stable [3], In contact with acetylene, silver and mercury salts will also give explosive acetylides, the mercury derivatives being complex [4], Many of the metal acetylides react violently with oxidants. Impact sensitivities of the dry copper derivatives of acetylene, buten-3-yne and l,3-hexadien-5-yne were determined as 2.4, 2.4 and 4.0 kg m, respectively. The copper derivative of a polyacetylene mixture generated by low-temperature polymerisation of acetylene detonated under 1.2 kg m impact. Sensitivities were much lower for the moist compounds [5], Explosive copper and silver derivatives give non-explosive complexes with trimethyl-, tributyl- or triphenyl-phosphine [6], Formation of silver acetylide on silver-containing solders needs higher acetylene and ammonia concentrations than for formation of copper acetylide. Acetylides are always formed on brass and copper or on silver-containing solders in an atmosphere of acetylene derived from calcium carbide (and which contains traces of phosphine). Silver acetylide is a more efficient explosion initiator than copper acetylide [7],... 

Hydroxy-4,4,6-trimethyl-2,5-hexadien-l-one, lanierone, 254, is a component of the complex aggregation signal of male Ipspini [468]. The carbon skeleton of 254 is the same as in isophorone 255, which has been identified as a volatile constituents of females of Ips typographus. Whether these compounds are degradation products of higher terpenes awaits further investigations. 

So kann z.B. 6-Chlor-3-nitro-2,3,4-trimethyl- bzw. 6-Acetoxy-3-methyl-3-nitro-l,4-cyclo-hexadien mit einer waBrigen Losung aus Natriumnitrit und Tetrabutylammoniumbromid in Dichlormethan bei 0° in 6 h in 60%iger Ausbeute zu 5-Nitro-1,2,3-trimethyl-benzol bzw. 4-Methyl- 1-nitro-henzol rearomatisiert werden2 ... 

Die waBrig-alkalische Ringspaltung von 1,1,2-Trimethyl- bzw. l,l-Dimethyl-2-ethyl-1,2,3,6-tetrahydro-pyridinium-jodid fuhrt in guten Ausbeuten zu 1 -Dimethylamino-(2Z,4E)-hexadien (65%) bzw. l-Dimethylamino-(2Z,4E)-heptadien (64%)2 ... 

Formations of 6-dimethylamino-2,4-hexadiene (163) from 1,6-dimethyl-3-piperideine,87 5-dimethylamino-4-methyl-1,3-pen tadiene (164) from l,3-dimethyl-3-piperideine,82 5-dimethylamino-3-methyl-1,3-pentadiene (165) from l,4-dimethyl-3-piperideine,83 and 6-di-methylamino-2,4-heptadiene (166) from l,2,6-trimethyl-3-piperi-deine94 may serve as further examples of the Hofmann exhaustive methylation in the 3-piperideine series. 

Hexadien 3,5,5-Trimethyl- E19b, 413 (a-Eliminierung/Ringoff-nung)... 

When N-sulfinylcarbamate 224 was reacted with ( , )-2,4-hexadiene 225 the formal [4 -I- 2] cycloaddition products (the reaction mechanism is a matter of debate [141-143]) 226 and epi-226 were formed in a 15 1 ratio, respectively. Treatment of this mixture with phenylmagnesium bromide followed by refluxing the resulting mixture with trimethyl phosphite in methanol af-... 

Application of the fragmentation reaction to a mixture of the isomeric 1,2,5-trimethyl-3-phospholcnes (5a) and (Sb) gives (ra/tr,rran.r-hexadiene-2,4 (6) in quantitative yield together with diethyl methylphosphonite (7). Since the diene (6) is the most stable isomer, it is not possible to comment on the stereospecificity of the reaction. 

The Weinreb group has recently developed stereoselective methodology for synthesis of unsaturated vicinal diamine derivatives from dihydrothiazine imines.49 For example, when cycloadduct 54 prepared from (E, )-2,4-hexadiene was treated with phenylmagnesium bromide followed by trimethyl phosphite, E-threo vicinal diamine 57 was formed cleanly in good yield [Ea. <27)1. 

The photoinitiated crosslinking of three ethylene-propylene-diene copolymers (EPDM elastomers) has been investigated in a series of studies > > >9. Commercial EPDM samples were used containing the following dienes ethylidene-norbomene (ENB), dicydopentadiene (DCPB) and hexadiene (HD). The main photoinitiators used were benzoyl-1-cyclohexanol (PI) from Ciba-Geigy and 2,4,6-trimethyl-benzoyl diphenylphosphineoxide (APO) from BASF, which both are photofragmenting (formulas 3 and 4) ... 

For example, the ultraviolet absorption maximum of the cholestadienone isomer (I) is close to that, of (II), but entirely different from those of the other isomers, (III), (IV), and (V). However, it is very close to the absorption maximum of a nonsteroidal, 4-methyl-6-(2,6,6-trimethyl-2-cyclohexenyl)-3,5-hexadien-2-one (VI). This is natural because the absorbing system is the same in (I), (II), and (VI), but is quite different from those of (III), (IV), and (V). 

I>ibrom-2.2 -oxido-l. 2.3-trimethyl-cyck>hexadien-(3.6)-on-(5) 17 II327. 

Hexadecylpyridinium chloride 1-Hexadecylpyridinium chloride n-Hexade-cylpyridinium chloride. See Cetylpyridinium chloride Hexadecyl sodium sulfate. See Sodium cetyl sulfate Hexadecyl stearate n-Hexadecyl stearate. See Cetyl stearate Hexadecyl (sulfophenoxy) benzenesulfonic acid, disodium salt See Sodium hexadecyl diphenyl disulfonate Hexadecyl tetradecanoate. See Cetyl myristate Hexadecyltrimethylammonium bromide. See Cetrimonium bromide Hexadecyl trimethyl ammonium chloride. See Cetrimonium chloride Hexadecyl trimethyl ammonium p-toluene sulfonate. See Cetrimonium tosylate Hexadienic acid Hexadienoic acid 2/4-Hexadienoic acid. See Sorbic acid 2/4-Hexadienoic acid potassium salt. See Potassium sorbate Hexaethylene glycol. See PEG-6... 

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