Propane derivatives

A general rule can be suggested for one of the principal ways of forming 1,3-oxazine derivatives. They can be formed from 1,3-sub-stituted propane derivatives of general formula ... 

The decomposition of these latter esters at high temperatures constitutes the important synthesis of cyclo-propane derivatives (Buchner) ... 

Water-soluble l,3-bis(di(hydroxyalkyl)phosphino)propane derivatives were thoroughly studied as components of Pd-catalysts for CO/ethene (or other a-olefins) copolymerization and for the terpolymerization of CO and ethene with various a-olefins in aqueous solution (Scheme 7.17) [59], The ligands with long hydroxyalkyl chains consistently gave catalysts with higher activity than sulfonated DPPP and this was even more expressed in copolymerization of CO with a-olefins other than ethene (e.g. propene or 1-hexene). Addition of anionic surfactants, such as dodecyl sulfate (potassium salt) resulted in about doubling the productivity of the CO/ethene copolymerization in a water/methanol (30/2) solvent (1.7 kg vs. 0.9 kg copolymer (g Pd)" h" under conditions of [59]) probably due to the concentration of the cationic Pd-catalyst at the interphase region or around the micelles which solubilize the reactants and products. Unfortunately under such conditions stable emulsions are formed which prevent the re-use... 

Goti A, Cordero FM, Brandi A (1996) Cycloadditions Onto Methylene- and Alkylidene-cyclo-propane Derivatives. 178 1 - 99... 

The U.S. ethylene industry has been based primarily on the cracking of ethane and propane derived from natural gas. The quantities and liquid contents of U.S. natural gases have been such as to permit substantial quantities of these light hydrocarbons to be recovered for use as economically attractive ethylene feedstocks. In Europe and Japan, however, naphthas have been generally the available and preferred feeds to pyrolysis. 

Figure 9-33 Schematic proton nmr spectra X and Y are nonmagnetic nuclei. For 2-propane derivatives, as at the top, the CH3 resonances are double because of the splitting produced by the single proton on C2. For the ethane derivatives, the right set of lines is always a triplet when observable because of the two protons of the X—CH2— group. We assume here that the chemical shifts of the CH Y3 protons are independent of the number of Y substituents.

In this chapter silylmethylamines are defined as compounds in which one silicon and one nitrogen atom are directly linked to an sp3-carbon atom. This excludes, for example, enamines1 or imines2 of acylsilanes, a-silylpyridine3 and a-silylpyrroles4 derivatives (in which central carbon is sp2 hybridized) and silyldiazomethanes.5 In the literature, primary amines of this type are commonly referred to as aminomethylsilanes, silylmethylamines, 1-silylamines, a-silylamines, or 3-sila-l-aza-propanes derivatives. In this chapter,... 

The 3,3-dimethyl-5-alkynyl-3H-pyrazoles 28, obtained by addition of 2-diazopropane to diacetylene, were irradiated to give the alkynylvinylcarbenes 29 and 30 the relative reactivity of which depended mainly on the substituent R on the triple bond. These carbenic species were trapped by cyclopentadiene or furan to give the ethynylcyclo-propane derivatives 31 and 32, respectively, Eq. (10) 23). 

The final photoreaction that we discuss in the context of chiral auxiliary effect in photorearrangements is the geometric isomerization of 2,3-diphenylcy-clopropane-1-carboxylic acid derivatives 40 and 2,3-diphenyl-1-benzoylcyclo-propane derivatives 41 [279,282,287,290,296-300]. As shown in Schemes 25 and 26, the isomerization in the former occurs through the cleavage of the C2-C3 bond, while that in latter occurs through the cleavage of the Ci-C2 and Ci C3 bonds. We have examined twenty-two 2,3-diphenylcyclopropane-l-carboxylic acid derivatives and fourteen 2,3-diphenyl-1-benzoylcyclopropane derivatives appended with a variety of chiral auxiliaries. The results in solution and zeolites are presented in Schemes 27 and 28. 

Similarly, Takahashi and coworkers reported that treatment of alkynes with zirconocene-ethylene complex (9) and homoallylic bromides gave allylcyclo-propane derivatives [21]. Therefore, the possibility of y-elimination of the halogen atom in zirconacyclopentene intermediates appeared to be more general as expected. The plausible mechanism is shown in Scheme 13. Carbozirconation... 

Reactivation potency of the compounds was tested in vitro on lyophilized eel AChE inhibited by diisopropyl-fluorophosphate (DFP). The compounds with a 2-oxapropane linker between both pyridinium rings were weaker reactivators compared to the corresponding propane derivatives. 

Oxidative phenol coupling. Schwartz et al. report that TTFA is an effective reagent for intramolecular oxidative phenol coupling. Thus oxidation of the diaryl-propane derivative (I) with 1 molar eq. of n i A in methylene chloride affords the... 

Alkene formation by cycloelimination has also been observed for several aminocyclo-propane derivatives. Thus amino acids 526 (equation 135) and 527 (equation 136) were converted into ethene and 1-butene, respectively by electrochemical oxidation or interaction with other oxidizing reagents, e.g. NaOCP aqueous chromic acid ... 

Krow, G. R., Lee, Y. B., Szczepanski, S. W., Zacharias, D. E., and Bailey, D. B Structural studies of 4-phenyl-2,4,6-triazatetracyclo[6.3.2.0 .0 trideca-10.12-diene-3,5-dione, a dihydrodiazabullvalene. Preference for a bisected aminocyclo propane derivative having an unusual planar triazolidinedione ring. J. Amer Chem. Soc. 109, 5744-5749 (1987). 

Pure essential oils are mixtures of more than 200 components, normally mixtures of terpenes or phenyl-propanic derivatives, in which the chemical and structural differences between compounds are minimal. They can be essentially classified into two groups A volatile fraction, constituting 90-95% of the oil in weight, containing the monoterpene and sesquiterpene hydrocarbons, as well as their oxygenated derivatives along with aliphatic aldehydes, alcohols, and esters and a nonvolatile residue that comprises 1-10% of the oil, containing hydrocarbons, fatty acids, sterols, carotenoids, waxes, and flavonoids. 

Kaufmann, A.,A. Manufacture of Glycidic Acids 1932 US 1,858,551 Kefalas A.,S Appetite-reducing Compositions Comprising Phenylamino Propane Derivatives 1962 GB 906,331... 

Beauchamp and Armen trout studied the reaction of Co with isobutane in an ion beam apparatus connected to a mass spectrometer. They were able to see very similar chemistry to that observed by Larsen and Ridge. Co reacts with C-H and C-C bonds exothermically, the latter being preferred on thermodynamic grounds. They showed in a later study, performed with deuterated propane derivatives, that all possible transformations involve insertion into both primary and secondary C-H bonds through 3c-2e transition states. Similar transition states were found by ab initio calculations in the reaction of methane with second-row transition metals by Siegbahn et al. The results of subsequent studies are summarized in reviews. ... 

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