Dimethylamine oxidation

For the regioselectivity similar rules as for the ester pyrolysis do apply. With simple, alkylsubstituted amine oxides a statistical mixture of regioisomeric olefins is obtained. On the other hand with cycloalkyl amine oxides the regioselectivity is determined by the ability to pass through a planar, five-membered transition state. This has been demonstrated for the elimination reaction of menthyl dimethylamine oxide 10 and neomenthyl dimethylamine oxide 11 ... 

The assessors experienced an explosion while drying the oxide in ethyl ether. Rather drastic precautions are recommended in handling it [1], A preparation, allowed to stand for a week rather than the day specified, exploded during concentration [2], Amine oxides from the standard preparation are inclined to retain hydrogen peroxide of hydration unless it is destroyed during work-up. The perox-idate (or diperoxidate) of dimethylamine oxide would be expected to be far more dangerous than the oxide itself [3],... 

Attempts to prepare 1 from some other precursors were largely unsuccessful N, N , A,/-(cyclopropane-l,2,3-trimethyl)-tris(dimethylamine oxide) decomposed unspecifically above 250 °C3 and pyrolysis of l,2,3-tris(acetoxymethyl)cyclopropane gave mainly benzene3 its gas-phase pyrolysis at 570-580°C produced a mixture of at least fifteen compounds containing perhaps a small amount of l7. 

Interaction of Long Chain Dimethylamine Oxide with Sodium Dodecyl Sulfate in Water... 

Figure 1. Effect of pH on ir-A and AV-A isotherms of octadecyl-dimethylamine oxide (ClsDAO) at 25 C, O.OIM NaCl subsolutions (NaOH or HCl/NaCl). Substrate pH 1-10.9, 2-5.5, 3-2.2.

CA 66, 39497e(1967) An aerated aqueous expl compn of improved sensitivity and regulated d and expl strength was provided by passing compressed air into a slurry contg 20—75% oxidizer (such as nitrates and perchlorates of NHa, K, Na, Ca, Ba, etc), 4—35% water, 4—60% sensitizer (such as TNT, Pentolite, PETN, smokeless propint, RDX or Tetryl ),A1 and Mg, 0.5—2.0% thickener (such as gaar gum, CM-cellulose starch), 0.6—5.0% surfactant [such as diethano lam ides of coconut lauric acids, triethanolamine salts, alkyl-poly (oxyethylene)s, arylalkylsulfonates mixed dimethylamine oxides]. Presence of... 

A cyclopropene (533) could not be isolated from the pyrolysis of cyclopropyl-dimethylamine oxide ... 

The preference for endo- or exo-cyclic elimination depends on the ring size. The cyclopentyl- and cy-cloheptyl-dimethylamine oxides (21 n = 5, 7) give more of the endocyclic alkene (22 = 5, 7) whereas the cyclohexylamine oxide (21 = 6) gives predominantly the exocyclic alkene (23 n = 6) because the six-membered ring has to adopt an unfavorable boat conformation in the transition state for endoCyclic elimination (equation 10). °... 

Af-Dodecyl-Af,Af-dimethylamine oxide yields with phenols a typical sigmoidal curve when chemical shifts are plotted vs. ApXa . 

Zwitterionic (amphoteric) Dodecyl betaine, dodecyl dimethylamine oxide, cocamidopropyl betaine, coco ampho glycinate, and so on. 

Based on DFT calculations on chlorophylls and, additionally, on ubiquinone and the RC main detergent, lauryl dimethylamine oxide or LDAO, we have then developed a force field for their classical modelization. Our approach to this undertaking was straightforward. We initially use the DFT optimized structures and the vibrational analysis to determine the bonded part of the potential parameters described by the AMBER potential function. Then, atomic ab initio partial charges on the chromophore are used to account for electrostatic effects. At a later stage, experimental data from X-ray crystallography are used to check the structural properties of the molecule in the condensed state and to refine the intermolecular Lennard-Jones parameters. 

Laureh)xl2. [Reilly-Whiteman] Lauryl dimethylamine oxide foam borater/sta-bilizer for light duty liqs. nonwetting agent for textile applies. 

Naxide 1230. piue ers ease] Lauryl dimethylamine oxide detergent, foam booster, stabilizer for cosmetics, hand cleanos, light du detergents, textiles, lubricants, ptqrer coatings. 

With increasing size of substituents, a greater tendency for trans- rather than di-olefin formation should be exhibited and this is found to be the case as dimethylamine oxides of the larger alicyclic rings give mainly the trans isomer. 

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