Pentane, 1,1 diphenyl

Pentane, 1,1-diphenyl-, 55, 10 2-Pentynoic acid, methyl ester, 55, 76 Peracetic acid [Ethaneperoxoic acid], 55, 87 88... 

Analog erhalt man aus Diphenylketen mit 2,4-Dimcthyl-3-thiono-pentan Diphenyl-thioessigsaure-S-(T isopropyl-2-methyl-l-propenylester) (60%)174. 

Tetraphenyl-4,4 -bi-4H-pyranyliden wird in einfacher Weise durch Elektro-reduktion und nachfolgende Dehydrierung von 2,6-Diphenyl-pyrylium-perchlorat in Acetonitril/Tetrabutylammoniumperchlorat zu 48% d.Th. erhalten (als Nebenprodukt fallt 15% d.Th. 1,5-Dioxo-l,5-diphenyl-pentan an)8 ... 

In AcetonitrilundTctraathylammoniumperchlorat als Leitsalz erhalt manbei —2 V an Quecksilber aus l,5-Dioxo-l,5-diphenyl-pentan 1,2-Dihydroxy-1,2-diphenyl-cyclopen-tan (76% d.Th.)2, vgI"3 und aus l,6-Dioxo-l,6-bis-[4-hydroxy-phenyl]-hexan /,2-Dihydroxy- 1,2-bis- 4-hydroxy-phenyl]-cyclohexan3 ... 

Evidence for the formation of alkyl and aryl radicals in some cases following loss of SO2 (Scheme 1) has been obtained. Thus, a small amount of M-pentane was formed in the decomposition of M-pentanesulphonyl azide in mineral oil ). Thermolysis of diphenyl sulphone-2-sulphonyl azide (8) in dodecane at 150 °C gave diphenyl sulphone 9 (27%) and diphenyl sulphone-2-sulphonamide 10 (9%) which arise by hydrogen abstraction by the aryl radical and sulphonyl nitrene, respectively. When this thermolysis was carried out in Freon E-4 at 150 °C, the products were diphenylene sulphone 77 (1.3%) (Pshorr-type cyclization product of the aryl radical) and 10 (1.5%) together with tars 16h Ferro-... 

Examples of such reactions are well known. Sloan, Breslow, and Renfrow found that both alkane and arenesulphonyl azides insert into the carbon-hydrogen bonds of saturated hydrocarbons 12>. Thus, 1-pentane,- 2-propane- and -toluene-sulphonyl nitrene inserted into cyclohexane to give 54, 60, and 58% yields of the corresponding IV-cyclohexylamide derivatives 8>. Similarly, 2-phenoxybenzene-, diphenyl sulphide-2-, and... 

Early work in the field of asymmetric hydroboration employed norbornene as a simple unsaturated substrate. A range of chiral-chelating phosphine ligands were probed (DIOP (5), 2,2 -bis(diphenyl-phosphino)-l,l -binaphthyl (BINAP) (6), 2,3-bis(diphenylphosphino)butane (CHIRAPHOS) (7), 2,4-bis(diphenylphosphino)pentane (BDPP) (8), and l,2-(bis(o-methoxyphenyl)(phenyl)phos-phino)ethane) (DIPAMP) (9)) in combination with [Rh(COD)Cl]2 and catecholborane at room temperature (Scheme 8).45 General observations were that enantioselectivities increased as the temperature was lowered below ambient, but that variations of solvent (THF, benzene, or toluene) had little impact. 

Iridium(III) hydride forms complexes with DIOP, BDPP (2,4-bis(diphenyl-phosphino)pentane), NORPHOS, and BINAP ligands to produce amines in 11 -80% ee.679 Similar modest results are obtained in the reduction of N-arylketimines with an iridium(HI) complex with (2S,3 S) -C HIRA PHOS as the chiral ligand.680 The indium complexes with chiral phosphinodihydrooxazoles catalyze the enantioselective hydrogenation of imines in supercritical carbon dioxide with up to 80% ee, but generally lower ee values are observed in... 

The direct high yield synthesis of oxaspiropentanes from almost any type of aldehyde or ketone represents a particularly useful transformation because of the high reactivity of such compounds. This approach proves to be exceptionally simple. The DMSO reaction mixture can be directly extracted with pentane or hexane, the hydrocarbon solvent removed and the product isolated by distillation or crystallization. Since diphenyl sulfide is the only by-product extracted with the oxaspiropentane, the mixture can normally be used for most further synthetic transformations. Table 2 summarizes some of the oxaspiropentanes prepared by this method. 

Fig. 8.3. Excimer-forming bifluorophores for the study of fluidity. 1 ,co-di-(l-pyrenyl)-propane 2 a,co-di-(l-pyrenyl)-methylether 3 10,10 -diphenyl-bi s-9-anth ryl methyloxide (DIPHANT) 4 meso-2,4-di-(N-carbazolyl) pentane.

The condensation products (1 1) of pentane-2,4-dione and 1,3-diphenyl-propane-1,3-dione with thiosemicarbazide, 4-methylthiosemicarbazide, and aminoguanidinium nitrate were formed (86KGS128 87ZOB584 90-KGS1260) as the cyclic isomers 78, which sometimes readily underwent dehydration to the corresponding pyrazoles. 

Castro GD, Lopez AJ, Petricio AR, etal. 1986. Effect of the pretreatment with pyrazole, cystamine or diphenyl-P-phenylenediamine (DPPD) on the CCKpromoted pentane evolution in rats. Res Common Chem Pathol Pharmacol 52 137-140. 

To complete the section on the synthesis of 4,4 -bipyridines, we summarize the methods reported for the preparation of some substituted 4,4 -bi-pyridines and 4,4 -bipyridinones. These methods are closely analogous to syntheses already discussed for some of the isomeric bipyridines. Thus the Hantzsch reaction using pyridine-4-aldehyde, ethyl acetoacetate, and ammonia gives 3,5-di(ethoxycarbonyl)-1,4-dihydro-2,6-dimethyl-4,4 -bipyridine, which after oxidation, followed by hydrolysis and decarboxylation, afforded 2,6-dimethyl-4,4 -bipyridine. Several related condensations have been reported. Similarly, pyridine-4-aldehyde and excess acetophenone gave l,5-diphenyl-3-(4-pyridyl)pentane-l,5-dione, which with ammonium acetate afforded 2,6-diphenyl-4,4 -bipyridine. Alternatively, 1-phenyl-3-(4-pyridyl)prop-2-enone, A-phenacylpyridinium bromide, and ammonium acetate gave the same diphenyl-4,4 -bipyridine, and extensions of this synthesis have been discribed. Condensation of pyridine-4-aldehyde with malononitrile in the presence of an alcohol and alkaline catalyst produced compounds such as whereas condensations of... 

Analog erhalt man aus 2-Nitro-l-phenyl-propan und l,3-Diphenyl-3-oxo-propen 4-Me-thyl-4-nitro-l-oxo-l,3,5-triphenyI-pentan (R1 = CH3, R2 = CH2 — C6H, R3 = R4 = CJI6) (75% Schmp, 175,5-176°)6. 

R = C2hs J-Amino-I-phenyl-propan 76% R - c4h, 1-Amino-I-phenyl-pentan 75% r-c6h, Amino-diphenyl-methan 87%... 

Amino-pentan 5-Amino-nonan 2-Amino-1,3-diphenyl-propan... 

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