Phenyl functions

Some more complex examples of this reaction type from the field of natural product synthesis, using a ketone, a thioenol ether, or a phenyl function as an internal nucleophile, are found in references 171-173. 

Phenyl-functionalized SWNTs HiPCO ([Pg.199]

A screening of (R)-bis-N-tosyl-BlNAM 151 and axially chiral (thio)urea derivatives 152-162 (10mol% loading 0.36 M catalyst concentration incorporating the N-aryl(alkyl) structural motif was performed at various reaction temperatures in di-chloroform using the asymmetric FC addition of N-methylindole to trans-Ji-nitrostyrene as model reachon (product 1 Scheme 6.158). The structure of bis(3,5-bistrifluoromethyl) phenyl functionalized binaphthyl bisthiourea 158 was identified... 

Phenyl-functionalized silicate mesophases with hexagonal or cubic symmetries influence of synthesis parameters. 

Organically modified porous silicates have been prepared under acidic conditions, by direct reaction of a mixture of phenyltriethoxysilane (PTES) and tetraethoxysilane (TEOS), and an aqueous solution of cetyltrimethylammonium bromide (CTAB). For a 1 4 molar ratio between PTES and TEOS, the hexagonal (2d, p6m) phase, but also a cubic phase analogous to the already reported SBA-1 phase (Pm3n), can be prepared. The surfactant can then be efficiently removed by calcination at 350°C, leading to phenyl-functionalized microporous silicates with two types of architecture. The influence of several parameters (PTES/TEOS ratio ethanol content) that affect the organization of the samples, will be discussed. 

Most of the one-pot syntheses of organically functionalized mesoporous silicates have been done under basic conditions. Only hexagonal phases (2d, p6m) were reported so far, except one very recent example of a phenyl-functionalized cubic phase [17], analogous to the bicontinuous MCM-48 phase (la3d) [8]. The cubic phase prepared under acidic conditions from PTES and TEOS is indeed related to a different type of cubic mesophases, micellar mesophases, reported in the literature for various surfactant/solvent systems [23] as well as for lipid-containing systems [24]. 

Two procedures have been used to prepare phenyl-functionalized silicate mesophase under acidic conditions. The only difference between them, is the pre-hydrolysis step, which was added in preparation B to initiate the hydrolysis and condensation reactions of the two precursors, prior to reaction with the CTAB solution. This step may cause the formation of co-condensed species between PTES and TEOS, and thus prevent phase separation [25],... 

Figure 1. X-ray diffraction patterns of the as-synthesized phenyl-functionalized silicate mesophases obtained from preparations A (a) and B (b) (PTES/TEOS = 1 4). Data recorded with synchrotron radiation (X = 1.2836 A).

Phenyl-functionalized Silicate Mesophases with Hexagonal or Cubic Symmetries 287... 

The primer chosen for this investigation consisted of an equimolar mixture of phenyl- and amino-functional silanes, suggested as a potential superior primer for aluminum/epoxy adhesive joints [7], The amino-functional silane is known to be effective as an adhesion promoter for fiber-reinforced composite materials [1, 2] as well as for epoxy/metal adhesive joints [8, 9] and provides for strong chemical interaction between the adhesive and primer, while the phenyl functional silane should reduce the overall concentration of polar, hydrophilic functional groups in the interphase region and at the same time maintain or improve the ability of the resin and primer to interpenetrate due to its structural similarity to the adhesive resin. 

Scheme 1.25 Crafting of phenyl functionalities on to a SWCNT bucky paper electrode by electrochemically coupling of aryldiazonium...

Figure 9. Naphthylimide bound to (a) phenyl-functionalized control receptor and (b) anthracyl receptor.

Supports for HIC have short alkyl chains or phenyl functionalities, the length of which is related to retention. The matrix can be either silica or polymer, as it is totally covered by the bonded phase and, thus, not ex-... 

Noh Ncooh Nnh2 Nc=o Noch3 Nsh Nh2c= Nbenz - ) whose entries represent the number of oxhydryl, carboxylic, aminic, carbonylic, meth-oxy, thio, methylene, and phenyl functional groups, respectively. 

One-pot synthesis of phenyl functionalized porous silicates with hexagonal and cubic symmetries... 

Phenyl functionalized silicates with cubic Pm3n and 2D p6m symmetries have been prepared by direct reaction of a mixture of phenyltriethoxysilane and tetraethoxysilane with an aqueous solution of cetyltrimethylammonium bromide, under acidic or basic conditions. Their structural characterization by XRD using synchrotron radiation, multinuclear MAS-NMR (including 2-dimensional H homonuclear correlation) and N2 adsorption-desorption isotherms will be reported in order to better describe the localization of the phenyl groups in the silicate framework. 

Phenol-trimethylbenzene transalkylation 25-0-04 Phenyl-functionalized mesoporous silica 07-0-02 I-Phenyl-1,2-propanedione hydrogenation 23-P-25 Pheromones 32-0-05... 

The Diels-Alder Reaction essentially consists in the direct combination of a compound possessing a conjugated diene system with a reagent that contains either a double-bond or a triple-bond, usually activated by conjugation with additional multiply-bonded systems, such as cyano, carbonyl, nitro, phenyl functions. It ultimately adds on to the 1, 4-positions of a conjugated diene system e.g., buta-1, 3-diene) with the formation of a 6-membered ring. Importantly, the ethylenic (double-bond) or acetylenic (tripple-bond) compormd is normally termed as the dienophile, the second reactant as the diene and the final desired product as the adduct. A few typical examples of such reagents are, namely maleic anhydride, para-benzoquinone, acetaldehyde and acetylene dicarboxylic esters. 

Analysis of Nonpolar Polymers MALDl analysis of hydrocarbon polymers is a challenging task since they are chemically inert due to the absence of functional groups in their chains, making their characterization somewhat difficult. In that sense, PS is one of the most common synthetic polymers analyzed by MALDI-MS due to the presence of the phenyl functionality in PS that facilitates its easier ionization compared to other nonpolar nonfunctional polymers such as poly(butadiene), poly(isoprene), polyethylene, or poly(propylene). 

In an extremely powerful technique, Dams et al. [540] separated 18 opiates and their derivatives (morphine, codeine, naloxone, hydrocodone, papaverine, dextromethorphan, noscapine, bupremorphine, methadone, heroin, thebacone, ethylmor-phine, 6-monoacetylmorphine, acetyldihydrocodeine, acetylcodeine, normethadone, normorphine, norcodeine) with baseline resolution in <12 min This was accomplished on a fast LC phenyl column 53 x 7 mm (2 = 280 nm) using a simple 100/0—>50/50 (at 10min)—> 0/100 (at 12min hold Imin) (90/5/5 water/ methanol/acetonitrile with 50 mM ammonium acetate)/(50/50 methanol/ acetonitrile with 50 mM ammonium acetate) gradient. The mobile phase components were adjusted to pH pp 4.5 with formic acid prior to use. The phenyl column was chosen ova- the conventional Cg or C g columns because of the increased selective interaction with analytes containing the planar phenyl functional group. Detection limits from 50 to 450ng/mL (analyte dependent) were reported. 

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