Ethyne, phenyl

KETONE, ferf-butyl phenyl [1-Propanone, 2,2-dimethyl-l-phenyl-], 55, 122 Ketone, methyl ethyl- [2-Butanone, 55, 25 KFTONES, acetylenic [Ketones, ethynic]... 

Dinitrogen tetroxide reacts with phenylethynyltrimethyltin to give benzoyl cyanide, probably by rearrangement of (dimeric) phenyl(nitroso)ethyne (Equation (84)).245... 

ACETONE TRIMETHYLS ILVL ENOL ETHER SILANE, (ISOPROPE NYLOXY )TR IMETHYL SILANE, TRIMETHYL[(1-METHYLETHENYL)0XY]- (1833-53-0), 65, 1 Acetonitrile, purification, 66, 101 Acetophenone Ethanone, 1-phenyl- (98-86-2), 65, 6, 119 Acetophenone silyl enol ether Silane, trimethyl[(1-phenylvinyl)oxy] Silane, tririethyl[(l-phenylethenyl )oxy]- (13735-81-4), 65, 12 4-ACET OXYAZET ID IN-2-ONE 2-AZET IDINONE, 4-HYDROXY-ACETATE (ESTER) 2-AZET ID1N0NE, 4-(ACETYL0XY)- (2 8562 - 53-0), 65, 135 Acetylene Ethyne (74-86-2), 65, 61... 

Via an amidoalkylation of bis(trimethylsilyl)ethyne (12) with methyl 2-chloro-N-ethoxycarbonylglycinate (57) under the influence of aluminum chloride the corresponding N-(ethoxycarbonyl)-a,a-TMS-ethynyl-glycinate (55) is isolated which is converted by means of lithium-di-isopropylamide (LDA) into a carbanion that reacts with alkylhalide to the substituted glycinate 59. Finally, after alkaline hydrolysis the unprotected a-acetylenic-a-aminoacid (60) (e. g. R = Benzyl a-ethynyl-a-phenyl-alanine is then obtained (Scheme 7). 

Diels-Alder reactions of alkynyl(phenyl)iodonium triflates (i.e. containing electron-withdrawing groups in the alkynyl moiety) and [bis(phenyliodonium)] ethyne ditrifiate have been employed for the synthesis of cyclic vinyliodonium salts (equations 143 and 144)17,41. The availability of such compounds offers considerable potential for the elaboration of densely functionalized cyclic molecules. 

The reactions of the pyrroles 632 with l-aroyl-2-phenyl ethynes 635 (R = Ph, 2-furyl) in the superbase KOH/DMSO system afforded a mixture of N- 637 ((E)- and (Z)-isomers) and C- 638 ((Z)-isomers) adducts, in a total yield of60-80%, the ratio of the products being dependent on the structure of the starting pyrrole (Equation 151) <2003RJ01195,2003S1272>. 

Aromatic compounds simple aromatics cleave to give a phenyl cation, m/z = 77, as the base peak which then loses ethyne to give m/z =51. Aromatics with CH2 next to the ring give the stable tropylium cation m/z = 91, and then lose ethyne to m/z = 65. I... 

The aryl vinyl tellurium compounds formed in these reactions (p. 401) are obtained exclusively, or at least predominantly, as the (Z)-isomers. With ethynyl ketones, aldehydes, acids, and esters, the nucleophile attacks the ethyne carbon in the / -position to the carbonyl groups Benzenetellurolate and bis[phenylethynyl] ketone produced only bis[2-phenyl-2-phenyltelluroethynyl] ketone and no monoadduct. ... 

Benzoyl-l-phenyl-l-ethenyI 4-Methoxyphenyl TeUurium A 100-/w/, two-necked flask, fitted with a dropping funnel, a nitrogen inlet tube, and a magnetic stirrer, is charged with a solution of 4.7 g (10 mmol) of bis[4-methoxyphenyl] di tellurium in 10 m/ of absolute ethanol. The apparatus is flushed with nitrogen and 0.84 g (10 mmol) of sodium borohydride are added in small portions to the stirred solution kept at 20°. When the solution has become light yellow, a solution of 3.1 g (15 mmol) of phenyl(benzoyl)ethyne in 10 m/ of ethanol is added over 30 min to the stirred tellurolate solution. The yellow precipitate is filtered off yield 4.9 g (71%) m.p. 151° (from ethanol). 

Thermolysis of (19) in absence of a phosphine generates 1,2-thiaphosphole 2-sullides (21) which can be trapped with suitable dienophiles such as acrylonitrile, styrene, butyl vinyl ether, and norbornene. The [4-1-2] cycloadducts such as (22) are formed regiospecifically <85BCJ667>. The reaction with dimethyl ethynedicarboxylate or phenyl ethyne affords 1-phosphabarrelene 1-sulfides (23) (Scheme 3) <86Ba2047>. 

Remarkably, subpicosecond injection rates were measured with Ru sensitizers anchored to a surface about 24 A from the semiconductor surface if the idealized Eiffel Tower-like orientation shown was achieved.118-120 Of course delocalization of the excited state onto the phenyl ethyne substituents of the bpy ligands would decrease the injection distance. Indeed, this bridge may act as a conduit for excited-state electron transfer to Ti02-12°... 

FIGURE 12.15 Tripodal sensitizers designed to place the ruthenium at a fixed distance from the semiconductor surface. Ideally, the three ester or carboxylic acid (not shown) groups bind to the surface and the adamantyl group orients the phenyl ethyne spacers approximately normal to... 

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