Phenyl-triphenylmethyl

Aus Phenyl-triphenylmethyl-diazen entsteht Triphenylphosphanoxid (68%) und 1,1,1-Triphenyl-ethanl63 ... 

Triphenylcarbinol reagiert dagegen als tert.-Alkohol bereits bei 100° ohne Aluminium-chlorid als Katalysator mit Diehlor-phenyl-phosphan zu Phenyl-triphenylmethyl-phos-phinsdure-chlorid206 (44%). 

Phenyl-propyl- XII/1, 232 Phenyl-(1,1,2,3-tetramethyl-butyl)- E2, 146 Phenyl-2-thienyl- -ethylester E2, 201 Phenyl-trichlormethyl- XII/1, 232 Phenyl-trichlormethyl- -methylester XII/1, 256 Phenyl-trichlormethyl- -propylester XII/1, 256 Phcnyl-(2-triethylstannyl-ethyl)- E2, 170 Phenyl-triphenylmethyl- -chlorid E2, 154 Phenyl-triphenylmethyl- -(2-mcthyl-propylcster) Xll/1, 256... 

Additional phenyl substituents stabilize carbocations even more Triphenylmethyl The triphenylmethyl group is 1, , t 11 1. . 1. .. 

Thiazole, 4-methyl-5-(2-hydroxyethyl)-in thiamine biosynthesis, 1, 97 Thiazole, 4-methyl-2-methylami nosynthesis, 6, 300 Thiazole, 4-methyl-2-phenyl-alkylation, 6, 256 mercuration, 6, 256 Thiazole, 2-(methylthio)-methylation, 6, 290 thermodynamic values, 6, 291 Thiazole, 2-methylthio-5-phenyl-synthesis, 5, 153 Thiazole, 4-methyl-5-vinyl-occurrence, 6, 327 Thiazole, 2-phenyl-acetylation, 6, 270-271 Conformation, 6, 237 synthesis, 5, 113, 6, 306 Thiazole, 4-phenyl-conformation, 6, 237 2,5-disubstituted synthesis, 6, 304 Thiazole, 5-phenyl-conformation, 6, 237 Thiazole, 2-phenyl-5-triphenylmethyl-synthesis, 6, 265 Thiazole, 2-(2-pyridyl)-metal complexes, 5, 51 6, 253 Thiazole, 4-(2-pyridyl)-metal complexes, S, 51 6, 253 Thiazole, tetrahydro-ring cleavage, 5, 80 Thiazole, 2,4,5-trimethyl-occurrence, 6, 327... 

Unsymmetrical azo compounds must be used to generate phenyl radicals because azobenzene is very stable thermally. Phenylazotiiphenylmethane decomposes readily because of the stabihty of the triphenylmethyl radical ... 

Additional phenyl substituents stabilize carbocations even more. Triphenylmethyl... 

S-Diphenylmethyl, 466 S-Bis(4-methoxyphenyl)methyl, 467 S-5-Dibenzosuberyl, 468 S-Triphenylmethyl, 468 S-Diphenyl-4-pyridylmethyl, 469 S-Phenyl, 469... 

A further extension of the MIMIRC reaction is seen in the synthesis of enantiomerically pure cyclohexanones. A successful diastereoselective MIMIRC reaction with 2-(rer/-butyldimethylsi-lyloxy)-4-phenyl-l,3-butadiene and an optically pure (Z)-y-alkoxy-substituted enone was performed using catalytic amounts (5 mol%) of triphenylmethyl perchlorate at — 78 ,C 360,408 (for a further example see Section 1.5.2.4.4.1.). 

Otsu and Tazaki90 have reported on the use of triphenylmethylazobenzene (39) as an initiator. In this case, phenyl radical initiates polymerization and the triphenylmethyl radical reacts mainly by primary radical termination to form a macroinitiator. The early report91 that triphenylmethyl radical does not initiate MMA polymerization may only indicate a very low rate of polymerization. The addition of triphenylmethyl radical to MMA has been demonstrated in radical... 

Pyridin mit seiner hohen Dielektrizitatskonstante ist ein geeignetes Losungsmittel (Zur AusfUhrung der re-duktiven C,C-Spaltung als Hauptreaktion). Triphenylmethyl-phenyl-keton liefert z. B. unter diesen Bedingun-... 

So laBt sich das Perchlor-triphenylmethyl-Radikal in 97%iger Ausbeute zu Tris- pen-tachlor-phenyl]-methan reduziercn2 Nitroxyl-Radikale reagierenzu Hydroxylaminen3 ... 

When (trichloromethyl)silanes reacted with excess benzene in the presence of aluminum chloride at reflux temperature, (triphenylmethyl)silanes were obtained as the major products along with (diphenylmethyl)silanes as minor products (Eq. (17)). Excess benzene was used to avoid the production of polymeric materials due to polyalkylation of one phenyl group. 

To confirm the production of benzene from the decomposition reaction of methyl(triphenylmethyl)dichlorosilane, the decomposition reaction of methyKdi-phenylmethyl)dichlorosilane in the presence of aluminum chloride was carried out in toluene solvent at 80 C. In this reaction, the exchange reaction between phenyl groups on the methyl group of (diphenylmethyl)(inethyl)dichlorosilane and toluene occurred to give [phenyl(tolyl)methylJ(methyl)dichlorosilane and (di-tolylmethyl)(methyl)dichlorosiIane (Scheme 1). " ... 

---