2- -4-phenyl-2,5,5-tetramethyl

Phenyl-tetrafluor-phosphoran reagiert mit Hexamethyl-l,3,2-dioxasilolan in To uol bei 110° (76 Stdn.) zum 2-Phenyl-tetramethyl-/,3,2-dioxaphospholan-2-oxid (50% Schmp. 108-110°)462 ... 

Phenyl-hydrazino)- -2-sulfid XII/2, 803 2-Phenyl- -2-oxid XII/1, 426 E2, 2l0 2-Phenylimino-2-pyrrolidino- E2, 821 2-Phenyl-tetramethyl- -2-oxid E2, 382 2-Propyloxy- -2-oxid El, 506... 

The following table shows the pK,s of a series of phenyl-tetramethyl-guanidinium structures in water and acetonitrile. Can you find a correlation between the pK s in the different solvents Rationalize why you might expect a correlation. 

Doubts about the validity of the biradical intermediate arose when the single crystal x-ray structure of the bis(perfluoro-phenyl)tetramethyl-2-tetrazenezinc(II) was shown to be the following (25). 

Pteridine, 6-oxo-5,6,7,8-tetrahydro-electrochemistry, 3, 285 Pteridine, 7-oxo-5,6,7,8-tetrahydro-electrochemistry, 3, 285 Pteridine, 2-phenyl-structure, 3, 266 Pteridine, 4-phenyl-structure, 3, 266 Pteridine, 7-phenyl-oxidation, 3, 305 Pteridine, 2,4,6,7-tetraamino-synthesis, 3, 291 Pteridine, 2,4,6,7-tetrabromo-reactions, 3, 291 Pteridine, 2,4,6,7-tetrachloro-hydrolysis, 3, 291 properties, 3, 267 Pteridine, 1,2,3,4-tetrahydro-structure, 3, 280 Pteridine, 5,6,7,8-tetrahydro-reduction, 3, 280 synthesis, 3, 305 Pteridine, 2,4,6,7-tetramethyl-NMR, 3, 266... 

Thieno[3,4-d][ 1,2,3]triazole, tetramethyl-synthesis, 6, 1015 Thieno[3,4-c][ 1,2,3]triazoles synthesis, 6, 1042 Thieno[3,4-d][ 1,2,3]triazoles reactions, 6, 1036 synthesis, 6, 1044 Thienyl radicals generation, 4, 832 Thiepane, 2-acetoxy-synthesis, 7, 574 Thiepane, 2-chloro-nucleophilic substitution, 7, 573 synthesis, 7, 574 Thiepane, 2-methyl-synthesis, 7, 573 Thiepane, 2-phenyl-synthesis, 7, 573 Thiepane, 3,3,6,6-tetramethyl-cycloaddition reactions, 7, 574 Thiepanes, 7, 547-592 applications, 7, 591... 

Xanthine, 8-phenyl-synthesis, S, 588 Xanthine, 1,3,8,9-tetramethyl-synthesis, S, 588 Xanthine, 2-thio-dethiation, S, 558 Xanthine, 6-thio-synthesis, S, 588 Xanthine, 1,3,8-trimethyl-synthesis, 3, 308 S, 575 Xanthine, 1,3,9-trimethyl-structure, S, 509 Xanthine, 2,3,8-trimethyl-synthesis, S, 574... 

The X-ray structure of JV,iV,7,9-tetramethyl-2-phenyl-3//-l,3,4-benzotriazcpin-5- amine shows that the seven-membered ring is severely puckered and that the N1-C2 and N4-C5 bonds possess double-bond character.351... 

Bei der Hydroaluminierung von Alkinen tritt die Oligomerisierung oft bereits bei nied-rigeren Temperaturen in den Vordergrund. So erhalt man z.B. aus 3,3-Dimethyl-l-phe-nyl-butin (I) und Bis-[2-methyl-propyl]-aluminiumhydrid (1 1) bei 50° 94% d.Th. cis-3,3-Dimethyl-l-phenyl-buten-(l) (II)5 neben 6% d.Th. trans,trans-2,2,7,7-Tetramethyl-4,5-diphenyl-octadien-(3,5) (III) ... 

Hydroxy-2-mercapto-5-athyl-6-phenyl- 252 4-Hydroxy-2-oxo-hexahydro- 56l 4-Hydroxv-2-oxo-l,3,5,5-tetramethyl-hexahydro-561... 

C25H27CIO3 /O/Oy-i -J) see Trenbolone acetate ( )-2-chioro-3-[4-[(6-hydroxy-2,5,7,8-tetramethyl-chroman-2-yl)incthoxy]phenyl]propionic acid (C23H27C10 97322-69-5) sec Troglitazone 4 -chloro-2 (24midazoUn-2-yl)benzophenone (Ci HjiClNjO 22590-J7-6) see Mazindo ... 

Ci,H 20 122-97-4) see Fomocaine Phenprobamate 3-phenyl-2-propenoic acid (C,jHh02 621-82-9) see Docetaxel [2alf-(2aa,4p,4aP,6 3,9a,lla,12a,12aa,12ba)]-3-phenyl-2-propenoic acid 12b-(acetyloxy)-12-(benzoyloxy)-2a,3,4,4a, 5,6,9,10,ll,12,12a,12b-dodecahydro-ll-hydroxy-4a,8, 13,13-tetramethyl-S-oxo-4,6-bis[[(2,2,2-trichloroethoxy)-carbonyl]oxy]-7,ll-niethano-l/f-cyclodeca[3,4]benz[l,2-A] oxet-9-yl ester... 

A stopped flow technique coupled with spectrophotometric analysis of the iron (II) complex formed has been used to investigate - the reactions of some organic complexes of iron(III) with the ion Fe ". The iron(III) was complexed with 1,10-phenanthroline, various substituted 1,10-phenanthrolines (5-methyl-, 5-nitro-, 5-chloro-, 5-phenyl-, 5,6-dimethyl-, 4,7-diphenyl-, and 3,4,7,8-tetramethyl-) and 2,2 -dipyridine, 4,4 -dimethyl-2,2 -dipyridine, and 2,2, 2"-tripyridine. The wavelengths used for the analysis lay in the region 500-552 m/i. 

In addition, Robbins and Eastman were able to trap the intermediate phenyl-acetyl radicals by photolysis in the presence of the 2,2,6,6-tetramethyl-piperidine-l-oxyl free radical,... 

More recently, Kaiser and coworkers reported enantiomeric specificity in the reaction of cyclohexaamylose with 3-carboxy-2,2,5,5-tetramethyl-pyrrolidin-l-oxy m-nitrophenyl ester (1), a spin label useful for identifying enzyme-substrate interactions (Flohr et al., 1971). In this case, the catalytic mechanism is identical to the scheme derived for the reactions of the cycloamyloses with phenyl acetates. In fact, the covalent intermediate, an acyl-cyclohexaamylose, was isolated. Maximal rate constants for appearance of m-nitrophenol at pH 8.62 (fc2), rate constants for hydrolysis of the covalent intermediate (fc3), and substrate binding constants (Kd) for the two enantiomers are presented in Table VIII. Significantly, specificity appears in the rates of acylation (fc2) rather than in either the strength of binding or the rate of deacylation. 

Miktoarm stars of the A(BC)2 type, where A is PS, B is poly(f-bulyl acrylate) (PtBA), and C is PMMA [161] have been synthesized, by using the trifunctional initiator 2-phenyl-2-[(2,2,6,6-tetramethyl)-l-piperidinyloxy] ethyl 2,2-bis[methyl(2-bromopropionato)] propionate (NMP, ATRP) (Scheme 86). In the first step, a PS macroinitiator with dual < -bromo functionality was obtained by NMP of styrene in bulk at 125 °C. This precursor was subsequently used as the macroinitiator for the ATRP of ferf-bulyl acry-... 

HPA = (4-pyridylthio)aceticacid 2-fur = 2-furoate a-fur = a-furoate = ([Pg.116]

Many cycloadditions of nitrones86,172 174 and thiones give cycloaddition-cycloreversion equilibria. A-Methyl-C,C-diphenyl- and A-methyl-C-phenyl-nitrones, react with aliphatic thiones forming 1,4,2-oxathiazolidines, while 4 does not afford a cycloadduct.172 A-Methyl-C,C-2,2,4,4-tetramethyl-3-cyclo-butanonenitrone reacts with alicyclic thioketones to give 1,4,2-oxathiazolidines,174 while with 4 it enters into a metathesis reaction. 

A detailed analysis of photoisomerization of the nitrone group in the nitroxyl radical 4-phenyl-2,2,5,5-tetramethyl-3-imidazoline-3-oxide-l-oxyl, based on double electron-nuclear resonance methods, has shown that in the absence of oxygen the photochemical reaction occurs without affecting the radical center. The... 

Acetyl-4-(4 -sulfophenyl-3-tetrazene, 2982 l-Ethyl-l,l,3,3-tetramethyltetrazenium tetrafluoroborate, 2586 3 -Phenyl-1 -(5 -tetrazoly 1)-1 -tetrazene, 2804 Potassium 3,5-dinitro-2(l-tetrazenyl)phenoxide, 2256 Tetraallyl-2-tetrazene, 3545 Tetramethyl-2-tetrazene, 1759 See HIGH NITROGEN COMPOUNDS... 

Chiral terf-diamines complexed with LAH gave very low optical yields in reductions of prochiral ketones. A/,/V,A/, /V -Tetramethyl-l,2-cyclohexanedi-amine complexed with LAH or LiAlD4 reduced phenyl alkyl, dialkyl ketones or benzaldehyde in <15% optical yields (109). 

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