2-chloro-2- 1,1,3,3-tetraphenyl

The photocatalyzed reduction of carbon dioxide at elevated pressure was also investigated. Porous glass beads were used to obtain efficient gas-liquid contact. With isopropanol as the solvent and 2-propyl formate as the reducing agent,the reaction products were carbon monoxide and hydrogen. The catalyst, chloro(tetraphenyl-porphinato)rhodium(III), was irradiated with visible light /21/. 

A chiral titanium complex with 3-cinnamoyl-l,3-oxazolidin-2-one was isolated by Jagensen et al. from a mixture of TiCl 2(0-i-Pr)2 with (2R,31 )-2,3-0-isopropyli-dene-l,l,4,4-tetraphenyl-l,2,3,4-butanetetrol, which is an isopropylidene acetal analog of Narasaka s TADDOL [48]. The structure of this complex was determined by X-ray structure analysis. It has the isopropylidene diol and the cinnamoyloxazolidi-none in the equatorial plane, with the two chloride ligands in apical (trans) position as depicted in the structure A, It seems from this structure that a pseudo-axial phenyl group of the chiral ligand seems to block one face of the coordinated cinnamoyloxazolidinone. On the other hand, after an NMR study of the complex in solution, Di Mare et al, and Seebach et al, reported that the above trans di-chloro complex A is a major component in the solution but went on to propose another minor complex B, with the two chlorides cis to each other, as the most reactive intermediate in this chiral titanium-catalyzed reaction [41b, 49], It has not yet been clearly confirmed whether or not the trans and/or the cis complex are real reactive intermediates (Scheme 1.60). 

Reductive ring opening of the [i-lactam 10 (X = O), obtained by [2 + 2] cycloaddition of chloro-sulfonyl isocyanate and tetraphenylcyclopentadiene followed by treatment with /7-cresol, with sodium hydride in anhydrous tetrahydrofuran yields 3,5,6,7-tetraphenyl-2//-azepin-2-one (11, X = O).41 Surprisingly, similar treatment of the reduced /Mactam 10 (X = H2) is reported to yield 3,5,6,7-letraphenyl-2//-azepine (11, X = H2), the first monocyclic 277-azepine to be isolated and characterized. Physical data for this compound, however, are inconclusive and attempts to reproduce this synthesis have failed.291... 

Imines 268 (Ar = phenyl, p-anisyl, p-chloro-phenyl) are dimerized on heating in aprotic solvents to give the yellow tetraphenyl p-benzoquinone imines 267 and (or) their reduction products, the colorless p-phenylene diamine derivatives 270ss ... 

The early days of Copper Phthalocyanine Green synthesis were dominated by two competitive routes. One method was the synthesis of tetraphenyl copper phthalocyanine (Bayer), while the second method involved chlorination of copper phthalocyanine in carbon tetrachloride to form copper tetradeca to hexadeca-chloro phthalocyanine (BASF). It was on the grounds of economical considerations that manufacturers began to prefer the chlorination technique in industrial scale production. 

Silacyclopentadiene, 1,1 -dimethyl-2,3,4,5-tetraphenyl-irradiation, 1, 618 structure, 1, 617 Silacyclopentadiene, 1-methyl-synthesis, 1, 615 Silacyclopentadienes Diels-Alder reactions, 1, 618 reactions, 1, 617-620 reduction, 1, 617 structure, 1, 616 synthesis, 1, 585, 586, 614-616 Silacyclopentane, 1-chloro-nucleophilic displacement, 1, 608 Silacyclopentanes, 1, 605-609 chemical properties, 1, 607-608 synthesis, 1, 605-607... 

Groups of reportedly photochromic systems which deserve further study include (a) disulfoxides (123,124), (b) hydrazones (125-129), (c) osazones (130-133), (d ) semicarbazones (134-143), (e) stilbene derivatives (144), (/) succinic anhydrides (145-148), and (g) various dyes (149,150). A number of individual compounds also remain unclassified as to their mechanism of photochromic activity. These include o-nitro-benzylidine isonicotinic acid hydrazide (151), 2,3-epoxy-2-ethyl-3-phenyl-1-indanone (152), p-diethyl- and p-dimethyl-aminophenyli-minocamphor (153), brucine salts of bromo- and chloro-nitromethionic acid (154), diphenacyldiphenylmethane (155,156), 2,4,4,6-tetraphenyl-1,4,-dihydropyridine (155,156), 2,4,4,6-3,5-dibenzoyltetrahydropyran (155,156), o-nitrobenzylidenedesoxybenzoin (157), p-nitrobenzylidene-desoxybenzoin (157), N-(3-pyridyl)sydnone (158,159), tetrabenzoyl-ethylene (160), and the oxidation product of 2,4,5-triphenylimidazole (161,162). 

The synthesis of a tetraphenyl derivative (rubrene, Expt 6.13) of the linearly fused tetracyclic aromatic hydrocarbon naphthacene involves an interesting intermolecular cyclisation process between two molecules of 1-chloro-1,3,3-triphenylpropa-1,2-diene. This substituted allene is formed in situ from 1,1,3-triphenylprop-2-yn-l-ol (Expt 5.41) when the latter is allowed to react with thionyl chloride and the resulting chlorosulphite ester heated with a little quinoline cyclisation occurs spontaneously under these reaction conditions to give rubrene which has an intense red colour. 

Refluxing of 2,5-bis[phenylhydroxymethyl]tellurophene and pyrrole in benzene/chloro-acetic acid (98 2) gave rise to 2,5-bis phenylpyrrolylmethylene]-2,5-dihydrotellurophene, which, in turn, was reacted with 2,5-bis[phenylhydroxymethyl]thiophene. Tetraphenyl-21-tellura-23-thiaporphyrin was isolated in 0.07% yield3. 

A clear drawback of this reagent is the availability of only one enantiomer, the one favoring the re attack to the aldehyde carbonyl, as only o-glucose is readily available, si Attack is observed with the analogous enolate prepared from Chloro( rf -cyclopentadienyl)[ (4R, trans )-2,2-dimethyl-a, a, a , a -tetraphenyl-l,3-dioxolane-4,5-dimethanolato(2—)-0, 0 ]ti-... 

Related Reagents. B-Allyldiisopinocampheylborane Chlo-ro(T -cyclopentadienyl)[(4/ ,fra 5)-2, 2-dimethyl-a,a,a, a -tetraphenyl-1, 3-dioxolane-4,5-dimethanolato(2—)-0 , 0 ]ti-tanium Chloro(cyclopentadienyl)bis[3-0-(l, 2 5,6-di-0-isopro-pylidene-a- D-glucofuranosyl)]titanium Diisopinocampheyl-boron Trifluoromethanesulfonate Diisopropyl 2-Allyl-l,3,2-di-oxaborolane-4,5-dicarboxylate (4/ ,5/ )-2,2-Dimethyl-4,5-bis-(hydroxydiphenylmethyl)-1,3-dioxolane 2,2-Dimethyl-a,a,a, a - tetraphenyl-l,3-dioxolane-4, 5-dimethanolatotitanium Diiso-propoxide. 

Chloro (rj -cyclopentadienyl) [(4B,trans)-2,2-dimethyl-a,a,a, a -tetraphenyl-l,3-dioxolane-4,5-dimethanolato(2-)-0 ,0 ]titanium... 

Thietanone 1,1-dioxides are unknown, although the tetraphenyl compound may be an intermediate in the oxidation of the 2-thietanone 308 with m-chloro-perbenzoic acid to the sulfinic-carboxylic acid anhydride 331. The methods discussed below apply to 3-thietanone 1,1-dioxides and derivatives. 

Chloro-8-oxo-l,5,6,7-tetraphenyl- 159 2(or 6)-Cyano-3,3-difluoro- 988 3-Cyano-8-(diphenyl-mcthylen)-3-methyl- 159 3-Cyano-3-methyl- 155... 

When, for instance, acetonitrile56 is heated with an equimolar amount of dry potassium methoxide at 140° for 5 h, it affords 70% of 4-amino-2,6-dimethylpyrimidine ( cyano-methine ), but 85% of 2,4,6-tris(dichloromethyl)-s-triazine is obtained from dichloroaceto-nitrile in the presence of aluminum chloride and hydrogen chloride at room temperature.57 Benzonitrile trimerizes in an acid catalysed reaction, most simply when its solution in chloro-sulfonic acid is kept at 0° for 1-2 days, giving 2,4,6-triphenyl-s-triazine (cyaphenin),58 but 85% of l,2-dihydro-2,2,4,6-tetraphenyl-s-triazine is formed under the influence of a sodium suspension.59... 

P,P,P, P -Tetraphenyl-p-phenylenediphosphine 218 (Chloro)diphenylphosphine (46 g, 0.2 mole) is dropped slowly into a dispersion of potassium (16 g, 0.4 mole) in dry tetrahydro-furan (250 ml) under nitrogen. The resulting deep red solution is treated, dropwise at room temperature, with a solution of p-dibromobenzene (24 g, 0.1 mole) in tetrahydrofuran (50 ml), and the mixture is heated for 8 h at 67°. After cooling, the product is hydrolysed with water (100 ml) and the organic phase is dried and freed from solvent. The residue is made into a slurry with ethanol and filtered off. The yield is 68% and the m.p. 170-171° (after recrystallization from propanol). 

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