Diphenylpropan

Dehydrohalogenation of the diastereomenc forms of 1 chloro 1 2 diphenylpropane is stereo specific One diastereomer yields (E) 1 2 diphenylpropene and the other yields the Z isomer Which diastereomer yields which alkene" Why" ... 

All lation. Several alkylation reactions are known either the olefin or chloro- group may be involved. The reactions of aEyl chloride with benzene are typical of reactions involving the double bond. In the presence of ferric or zinc chloride, the products are 2-chloropropylbenzene [10304-81-1] and 1,2-diphenylpropane [5814-85-7]. ... 

The bulk of epoxy resins are still those based on epichlorhydrin and dihydroxy-diphenylpropane and may be represented by the following structure ... 

Photolysis at about 40°C of the /ra is-isomer of the unsymmetrical azo-compound 4 in benzene solution yields dicumyl and biphenyl as the major products, together with a little a-methylstjTene, cumene, and 2,2-diphenylpropane. All these products show polarization of their... 

Among the plant phenols, the flavonoids and the anthocyanidins, belonging to the 1,3-diphenylpropans, have been studied in most detail, mainly because of their potential health benefits. With more than 4,000 different flavonoids known, systematic studies of the effects of variation in molecular structure on physico-chemical properties of importance for antioxidative effects have also been possible (Jovanovic et al, 1994 Seeram and Nair, 2002). Flavonoids were originally found not to behave as efficiently as the classic phenolic antioxidants like a-tocopherol and synthetic phenolic antioxidants in donating... 

Prevalence of the head-to-tail arrangement in vinyl polymers is abundantly confirmed by determinations of polymer structures. Staudinger and Steinhofer found that destructive distillation of polystyrene at about 300° yielded 1,3-diphenylpropane, 1,3,5-triphenyl-pentane, and 1,3,5-triphenylbenzene... 

Chiral diphosphites based on (2R,3R)-butane-2,3-diol, (2R,4R)-pentane-2,4-diol, (25, 5S)-hexane-2,5-diol, (lS -diphenylpropane-hS-diol, and tV-benzyltartarimide as chiral bridges have been used in the Rh-catalyzed asymmetric hydroformylation of styrene. Enantioselectivities up to 76%, at 50% conversion, have been obtained with stable hydridorhodium diphosphite catalysts. The solution structures of [RhH(L)(CO)2] complexes have been studied NMR and IR spectroscopic data revealed fluxional behavior. Depending on the structure of the bridge, the diphosphite adopts equatorial-equatorial or equatorial-axial coordination to the rhodium. The structure and the stability of the catalysts play a role in the asymmetric induction.218... 

Flavonoids have a skeleton of diphenylpropanes, two benzene rings (A and B) connected by a three-carbon chain forming a closed pyran ring with the benzene A ring (see Fig. 2.1). 

Isoflavones also have a diphenylpropane structure in which the B ring is located in the C3 position. They have structural analogies to estrogens, such as estradiol, with hydroxyl groups at the C7 and C4 positions (Shier and others 2001). 

When the hydrogenation of ( )-l,2-diphenylpropene is performed under D2, 1,2-diphenylpropane is selectively deuterated in positions 1 and 2, which shows that no isomerization of the alken takes place under these conditions. Noteworthy, the reaction rate is highly dependent on the substrate, and typically... 

FIGURE 4.45 Cytochrome P450-catalyzed hydroxylation of p-mono-substituted 1,3-diphenylpropanes. 

In 1953, Farbenfabrican Bayer made linear Polycarbonates. By 1957, they were commercially produced by Bayer and General Electric. These polymers are based on 4, 4 -dihydroxy diphenylpropane (bisphenol A) and phosgene. 

Attempts to influence the hydrogen bond by changes at the P-carbons, for example, as in l,3-diphenylpropane-l,3-dione, resulted in crystals whose structure showed them to be entirely of the keto tautomer with a cw-diketo conformation and a carbonyl-carbonyl dihedral angle of ca. 90° (Emsley et al., 1987). 

The compounds [(n -Cp)TiClL2] (HL = acac, l-phenylbutane-l,3-dione, or l,3-diphenylpropane-l,3-dione) have been prepared by the reaction of... 

Figure 4. Radical chain propagation steps for the pyrolysis of silica-immobilized I, 3-diphenylpropane. Bracket notation denotes species exists in both gas-phase and surface-attached forms.

Cathodic surfaces of finely divided platinum, palladium and nickel have a low hydrogen overvoltage and the dominant electrochemical reaction is the generation of a layer of hydrogen atoms. The electrocatalytic hydrogenation of aldehydes and ketones can be achieved at these surfaces. Cathodes of platinum or palladium black operate in both acid solution [203] and in methanol containing sodium methoxide [204], The carbonyl compound is converted to the alcohol. Reduction of 4-tert-butylcyclohexanone is not stereoselective, however, 1,2-diphenylpropan-l-one is converted to the / reo-alcohol. 

The first reactions concerned (Simons and Archer, 27) alkylation of benzene with propylene to form isopropylbenzene, with isobutene to form f-butylbenzene and di-f-butylbenzene, and trimethylethylene to form amylbenzene. Later on (Simons and Archer, 28) studied these and other reactions in more detail and showed that high yields could be obtained and that the product was not contaminated with tars or other obnoxious impurities. It was shown that the products obtained with trimethylethylene were mono- and di-f-amylbenzene, that phenyl-pentane resulted from the use of pentene-2, and that cyclohexene produced cyclohexylbenzene. Cinnamic acid reacted with benzene (Simons and Archer, 29) to form /3-phenylpropionic acid and allyl benzene reacted with benzene to form 1,2-diphenylpropane. It is interesting to note that although allyl alcohol reacted with benzene to form 1,2-diphenylpropane, the intermediate in the reaction, allylbenzene, was isolated and identified. This shows that in this case the hydroxyl reacted at a more rapid rate than the double bond. Both di- and triisobutylene reacted with phenol (Simons and Archer, 30) at 0°, when using hydrogen fluoride containing only relatively small quantities of water, to form f-butyl-benzene, but diisobutylene with 70% hydrogen fluoride produced p-f-octylphenol. Cyclohexene reacted with toluene to form cyclohexyl-toluene and octene-1 rapidly reacted with toluene to form 2-octyltoluene (Simons and Basler, 31). 

Butyl alcohol and benzene gave both mono- and di-i-butylbenzene (Simons et al., 37). Allyl alcohol reacted with benzene to produce both allylbenzene and 1,2-diphenylpropane. (Simons and Archer, 38.) The activity of the hydroxyl group is indicated in the fact that 2-phenyl-propanol was not separated. Benzyl alcohol reacted with benzene to form diphenylmethane (Simons and Archer, 39) despite the fact that this reaction is reported (Calcott et al., 34) to form 1,2,3,4,5,6-hexa-phenylcyclohexane by the polymerization of the alcohol. Isopropyl alcohol with benzene gave isopropylbenzene, 1,4-diisopropylbenzene,... 

The first gas-solid imbibitions of chiral molecules by the host (S)-1,2-dihydroxy-1,1-diphenylpropane were not highly enantioselective [46] and can therefore not be discussed here. 

Under optimized conditions, the 83-catalyzed (1 mol% loading) Michael addition of acetylacetone to various aryl nitroalkenes as well as alkyl nitroalkenes proceeded in good to excellent yields (80-97%) and enantioselechvities (82-99%) of the desired adducts 1-5 (Scheme 6.93). The authors also reported the successful enantioselective Michael addihon of l,3-diphenylpropane-l,3-dione (adduct in... 

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