4.5- dipropyl-2-methyl

Tellnronium Dipropyl-methyl-(Iodide) El2b, 685 (R2TeI2 + HjC-I)... 

Diphenyl dichlorosilane, 59 Diphenyl oxide, 59 Diphenylamine, 58 1,2-DiphenyUiydrazine, 59 DIPLAST , phthalates, 59 Dipropyl ketone, 59 Dipropylamine, 59 Dipropylene glycol methyl ether, 59 Diquat, 59... 

In the course of this study, the authors determined /Lvalues for dibenzyl, methyl phenyl, methyl p-nitrophenyl, di-p-tolyl, di-isopropyl and tetramethylene sulphoxides and for diethyl, dipropyl and dibutyl sulphites. The /Lscales are applied to the various reactions or the spectral measurements. The /Lscales have been divided into either family-dependent (FD) types, which means two or more compounds can share the same /Lscale, family-independent (FI) types. Consequently, a variety of /Lscales are now available for various families of the bases, including 29 aldehydes and ketones, 17 carboxylic amides and ureas, 14 carboxylic acids esters, 4 acyl halides, 5 nitriles, 10 ethers, 16 phosphine oxides, 12 sulphinyl compounds, 15 pyridines and pyrimidines, 16 sp3 hybridized amines and 10 alcohols. The enthalpies of formation of the hydrogen bond of 4-fluorophenol with both sulphoxides and phosphine oxides and related derivatives fit the empirical equation 18, where the standard deviation is y = 0.983. Several averaged scales are shown in Table 1588. 

Nishimura and coworkers57-59 studied the y-radiolysis of aqueous solutions of sulfoxide amino acids. Sulfoxide amino acids are the precursors of the flavors of onions (S-propyl-L-cysteine sulfoxide, S-methyl-L-cysteine sulfoxide and S-(l-propenyl)-L-cysteine sulfoxide) and garlic (S-allyl-L-cysteine sulfoxide). In studies on sprout inhibition of onion by /-irradiation it was found that the characteristic flavor of onions became milder. In the y-radiolysis of an aqueous solution of S-propyl-L-cysteine sulfoxide (PCSO)57,58 they identified as the main products alanine, cysteic acid, dipropyl disulfide and dipropyl sulfide. In the radiolysis of S-allyl-L-cysteine sulfoxide (ACSO) they found that the main products are S-allyl-L-cysteine, cysteic acid, cystine, allyl alcohol, propyl allyl sulfide and diallyl sulfide. The mechanisms of formation of the products were partly elucidated by the study of the radiolysis in the presence of N20 and Br- as eaq - and OH radicals scavengers, respectively. 

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. 

In verd. Losung wird Chloral mit Diathyl-, Dipropyl- bzw. Bis-[2-methyl-propyl]-zink zum 2,2,2-Trichlor-athanol reduziert (Bd. XIII/2a, S. 712f.) (Dimethyl-zink wird addiert). 

The fact that many 4 systems are paratropic even though they may be nonplanar and have unequal bond distances indicates that if planarity were enforced, the ring currents might be even greater. That this is true is dramatically illustrated by the NMR spectrum of the dianion of 83 (and its diethyl and dipropyl homologs). We may recall that in 83, the outer protons were found at 8.14-8.67 8 with the methyl protons at —4.25 8. For the dianion, however, which is forced to have approximately the same planar geometry but now has 16 electrons, the outer protons are shifted to about -3 8 while the methyl protons are found at 21 8, a shift of 258 We have already seen where the converse shift was made, when [16]annulenes that were antiaromatic were converted to 18-electron dianions that were aromatic. In these cases, the changes in NMR chemical shifts were almost as dramatic. Heat of combustion measurements also show that [16]annulene is much less stable than its dianion. 

Dimethyl Dipropyl Dibutyl Methyl Ethyl Methyl Vinyl Methyl Amyl... 

Diethyl ether Ethyl vinyl ether Dipropyl ether Diisopropyl ether Methyl butyl ether Butyl vinyl ether... 

Dimethyl ether Ethyl methyl ether Diehyl ether Dipropyl ether Diisopropyl ether Dibutyl ether 1,2-Dimethoxy ethane... 

Acetic acid, butyl ester Acetic acid, pentyl ester Acetic acid, decyl ester Acetic acid, benzyl ester Acetic acid, benzyl ester Acetic acid, 1-cyclohexenyl ester Acetic acid, 3-cyclohexenyl ester Butyric acid, benzyl ester Phenylacetic acid, propyl ester Oleic acid, methyl ester Linoleic acid, methyl ester Linolenic acid, methyl ester Adipic acid, methyl ester Adipic acid, ethyl ester Adipic acid, diethyl ester Adipic acid, dipropyl ester Adipic acid, (methylethyl)ester Adipic acid,... 

The oxygen-bridged carbodications analogous to 29, bis(dipropyl)dicycloprope-nium ether, ditropylium ether, and dipyridylium ether ditiiflates (42, 43, and 44), have been synthesized from the reaction of triflic anhydride with dipropylcyclopro-penone, tropone, and A-methyl-2-pyridone, respectively." These carbodications, unlike 37, are quite stable for isolation and characterization. 

Complex formation equilibria in binary mixtures of chloroform with dipropyl ether (PE), diisopropyl ether (IPE), methyl tert-butyl ether(MBE), tetrahydrofuran (THE), 1,4-dioxane (DOX), acetone (AC), and methyl acetate (MA) have been analyzed in detail. The complex formation equilibria in chloroform mixtures was compared to those previously examined for halothane (2-bromo-2-chloro-l,l,l-trifluoroethane) mixed with the same oxygenated solvents. It was found that the H-bonds formed by halothane are stronger than those formed by chloroform (Dohnal and Costas, 1996). 

Aliphatic sulfur compounds, in particular disulfides such as methyl propyl disulfide, dipropyl disulfide, and especially cis- and /ran -propenyl propenyl disulfide are mainly responsible for the typical odor of onion oil [235]. The presence of 2-hexyl-5-methyl-3(2H)-furanone [33922-66-6] is a characteristic of authenticity [235a]. 

Onion Allium cepa L. Methylpropyl disulphide, dipropyl disulphide, propenylpropyl disulphide, 2-hexyl-5-methyl-3(2H)-furanone... 

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