1.5- Diphenyl-3-pentanone

Pioneering work on the photochemical diastereocontrol in zeolite supercages was reported by Turro and coworkers in 1991 [48]. They investigated the diastereoselective photodecarbonylation of 2,4-diphenyl-3-pentanone (DPP) adsorbed in various cation-exchanged X and Y zeolites to find that the diastereo-selectivity of d9l- over mestf-2,3-diphenylbutane increases in the order LiX NaX < LiY NaY < KY. In 1996, Ramamurthy and coworkers reported the first example of photochemical asymmetric induction in chirally modified zeolites [49], where they employed the Norrish/Yang type II reaction of cis-4-tert-butyl-cyclohexyl aryl ketones to the corresponding cyclobutanols. Since then, a variety of asymmetric photoreactions in zeolite supercages have been reported as reviewed below. 

The mechanism of photo-oxidative degradation of polystyrene was also investigated using low molecular compounds such as benzene 3-phenyl-pentane [1356] 2-phenylbutane [1360, 1361] 1,3-diphenylpropane-l-one [719, 725] 1,3-diphenylpropane 1,3-diphenylbutane 2,4-diphenylpentane [1293] cumene cumene hydroperoxide [759] acetophenone hexanoic acid 3-heptanone y-valerolactone 2-phenyl-2-propanol [1250, 1397] benzal-dehyde benzoic acid l-3-diphenyl-propanone-3 l,3-diphenyl-buten-2,3-on-l (dypnone) l,3-diphenylpropen-2,3-on-l (chalcone) l-phenyl-butanedion-2,3 l-diphenylpropanedion-1,2 l-phenyl-butanedion-1,3 phenylacetic aldehyde l,5-diphenyl-pentanone-3 4-phenyl-butanone-2 [1250]. 

C ( propyl) N phenylmtrone to N phenylmaleimide, 46, 96 semicarbazide hydrochloride to ami noacetone hydiochlonde, 46,1 tetraphenylcyclopentadienone to diphenyl acetylene, 46, 44 Alcohols, synthesis of equatorial, 47, 19 Aldehydes, aromatic, synthesis of, 47, 1 /3-chloro a,0 unsaturated, from ke tones and dimethylformamide-phosphorus oxy chloride, 46, 20 from alky 1 halides, 47, 97 from oxidation of alcohols with dimethyl sulfoxide, dicyclohexyl carbodumide, and pyndimum tnfluoroacetate, 47, 27 Alkylation, of 2 carbomethoxycyclo pentanone with benzyl chloride 45,7... 

Dimethyl sulfate Sulfuric acid, dimethyl ester (8,9) (77-78-1) Isobutyl methyl ketone 2-Pentanone, 4-methyl- (8, 9) (108-10-1) Acetylene, diphenyl- (8) Benzene, , -(l,2-ethynediyl)bis- (9) (501-65-5)... 

A similar acetylation procedure (without p-toluenesulfonic acid) has been employed to prepare other /3-diketones.5 As examples, cyclohexanone was converted to 2-acetylcyclohex-anone (73%) cyclopentanone yielded 2-acetylcyclopentanone (80%) 3-pentanone yielded 3-methyl-2,4-hexanedione (81%) dibenzyl ketone yielded l,3-diphenyl-2,4-pentanedione (72%), and acetophenone gave benzoylacetone (70%). 

Propanone, 1,3-dibromo-l,3-diphenyl- (8,9) (958-79-2) Cyclopentadiene 1,3-Cyclopentadiene (8,9) (542-92-7) CH3CHBrCOCBr(CH3)2 3-Pentanone, 2,4-dibromo-2-methyl-... 

Synthesis (Kleemann et al. 1999, Janssen (Janssen), 1973 Janssen et al. (Janssen), 1973, Stokbroekx et al., 1973, Niemegeers et al., 1974) ) Treatment of 2-oxo-3,3-diphenyl-tetrahydrofuran, synthesized by treatment of diphenyl-acetic acid ethyl ester with ethylene oxide, with HBr(gas) yields bromo derivative i, which is then converted into butyryl chloride derivative ii by means of thionyl chloride in refluxing chloroform. Reaction of derivative ii with dimethylamine in toluene affords dimethyl (tetrahydro-3,3-diphenyl-2-furylidene)ammonium bromide, which is then condensed with 4-(4-chlorophenyl)-4-piperidinol by means of Na2C03 and Kl in refluxing 4-methyl-2-pentanone to provide loperamide. 

Use Table 24-3 to predict the elution order of the following compounds from columns containing (a) poly(dimethylsiloxane), (b) (diphenyl)0 35(dimethyl)065polysiloxane, and (c) poly(ethylene glycol) hexane, heptane, octane, benzene, butanol, 2-pentanone. 

A mixture of 6.33 parts of 4-(p-chlorophenyl)-4-piperidinol, 8 parts of sodium carbonate, 0.2 part of potassium iodide and 240 parts of 4-methyl-2-pentanone is distilled azeotropically. Then there are added 12.12 parts of dimethyl-(tetrahydro-3,3-diphenyl-2-furylidene)ammonium bromide (from the preceding step) and the whole is stirred and refluxed for about 15 hours. The reaction mixture is filtered hot and the filtrate is evaporated. 

Reaction of cis- and tra i-l,3-diphenyl-2,3-epoxy-4-bromo-l-butanones with triethyl phosphite at 120°C goes to completion to give diethyl cis- or tra i-l,3-diphenyl-4-oxo-2,3-epoxybutylphospho-nates as the only isolated products in high yields." Several preparations of 4-oxoaIkylphosphonates are based on the use of masked ketones. For example, the Michaelis-Arbuzov reaction of 5-chloro-2-pentanone ethylene ketal with triethyl phosphite followed by unmasking of the latent carbonyl group gives diethyl 4-oxopentylphosphonate in modest yield (38%)." ° ... 

Pogonowski have described a route to 5-alkyl-A -cyclopentenones from cyclo-pentanone, the first step of which is sulfenylation with diphenyl disulfide and LDA followed by periodate oxidation to the jS-keto sulfoxide (1). This product is converted into the dianion with 2 eq. of lithium diisopropylamide the dianion... 

Methyl-4.4-diphenyl-. oxa-3-thia-cyclu> pentanon-(5).enigs5uie-(2)-athylester 19II322. 

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