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4,4 -Isopropylidene diphenyl

Poly(4,4 -isopropylidene-diphenyl carbonate)-block-poly(styrene) ... [Pg.1510]

All PEIs derived from 3-aminophenol exclusively formed only isotropic melts. Thermotropic character was however observed in PEIs derived from 4-aminophenol and diphenylether 3,3, 4,4 -tetracarboxylic acid, but not when diphenyl sulphone or isopropylidene diphenyl units were employed. PEIs formed from 4-aminophenol and biphenyl-3,3, 4,4 -tetracarboxylic anhydride have also been found to form nematic melts [37]. [Pg.197]

Hydroxy-1,2-dimethyl- 582 3-Hydroxy-1,2-diphenyl- 582 3-Hydroxy-l-oxo-2-phenyl- 607 1-Isopropyliden- 497 1-Methyl-l-chlorcarbonyl-182 1-Methyl-1 -formyl- 182 1-Oxo- 497... [Pg.950]

Ci7H20O4S2 o-Ribose diphenyl dithioacetal (RIBPTA10)316 Ci8H30O10 Methyl 3,5-0-isopropylidene-2-0-(methyl 3,5-O-isopropyli-dene-a-D-xylofuranosid-3-yl)-a-D-xylofuranoside (MPXFXF)325 C21H42N5Ou+ I- H20 C2HeO Apramycin hydriodide, monohydrate, ethanolate (APRAMI)326... [Pg.372]

The reactions of isopropylidene (l-methylthioalkylidene)malonates and arylamines in boiling ethanol for 2-4 hr, or in diphenyl ether at 140°C for 0.5 hr, afforded isopropylidene l-(aryIamino)alkylidenemalonates (440) in 54-87% yields (87S482). [Pg.114]

The cyclization of isopropylidene l-(phenylamino)alkylidenemalonates (1165) in diphenyl ether at 25Q-260°C under nitrogen, or in boiling Dowtherm A, gave 2-substituted 4-hydroxyquinolines (1166) in 63-96% yields (69BRP1147760 87S482). [Pg.252]

The thermal ring closure of isopropylidene N-[amino(thio)carbonyl]ami-nomethylenemalonates (439, X = O, S) in boiling diphenyl ether for 5 min afforded uracil and thiouracil (1193, X = O, S) in 68% and 70% yields, respectively (84SC96I). [Pg.255]

The heating of isopropylidene arylaminomethylenemalonate (1212) in boiling diphenyl ether under nitrogen for 5 min gave tricyclic pyrano[2,3,4-dfjquinoline (1213) in 66% yield after flash column chromatography (87T4803). [Pg.259]

Potassium triethylborohydride, 260 Sodium borohydride, 21 Ring-forming reactions 2,2 -Dihydroxy-1,1 -binaphthyl, 113 Other asymmetric reactions Camphor-10-sulfonic acid, 62 Di-jjL-chlorobis(l,5-cyclooctadiene)di-rhodium-2,3-0-Isopropylidene-2,3-dihydroxy-1,4-bis(diphenyl-phosphine)butane, 153... [Pg.359]

The thermal cyclization of isopropylidene 2-pyridylaminomethylene-malonates 147 by heating in diphenyl ether and Dowtherm A gave 3-unsubstituted 4//-pyrido[l,2-a]pyrimidin-4-ones 148 (84S152 85JHC481, 85SC125 89TL1529 91JHC1287). [Pg.144]

Asymmetric hydroboration of prochiral alkenes has been achieved using transition metal catalysts and chiral phosphines as ligands to obtain enantiomerically pure alkyl boronates <1997CC173>. Catalysts such as Rh(COD)2+BF4 , Rh(COD)2+Cl, Rh+BF4 , etc., in combination with chiral phosphines like DIOP 71, BINAP 72, CHIRAPHOS 73, DIPAMP 74, BDPP 75, ferrocene-based diphosphines 76<1999TL4977>, etc., have been employed for the asymmetric hydroboration of prochiral alkenes with moderate to high ee (DIOP = 2,3-0-isopropylidene-2,3-dihydroxy-l,4-bis(diphenylphosphino)butane BINAP = 2,2-bis(diphenyl-phos-phanyl)-l,1-binaphthyl CHIRAPHOS = 2,3-bis(diphenylphosphino)butane DIPAMP = l,2-bis[(2-methoxyphe-nyl)phenylphosphino]ethane BDPP = 2,4-bis(diphenylphosphino)pentane). [Pg.623]

To obtain model compounds for the study of inositol phosphates, Kil-gour and Ballou180 treated di-O-isopropylidenepinitol (LXIV) and di-O-isopropylidene-Zeyo-inositol (XXVIII) with diphenyl phosphorochloridate. For the latter, the result was surprising instead of the expected mono-or di-phosphate, a cyclic phosphate (LXXIX) was obtained. In it, the phosphate group is attached to two irans-hydroxyl groups, like the third iso-propylidene group in tri-O-isopropylidene-fevo-inositol (see p. 149). This... [Pg.174]

FIG. 18. Synthesis of insolubilized 2,3-0-isopropylidene-2,3-dihydroxy-l,4-bis(diphenyl-phosphino)butane (DIOP). [Pg.102]

Abbreviations ACMP = o-anisylcyclohexylmethylphospine DIOP =2,3-0-isopropylidene-2,3-dihydroxyl-l, 4-bis(diphenylphosphino)butane NMDPP = neomenthyldiphenylphos-phine MDPP = menthyldiphenylphosphine CAMPHOS = 1,2,2-trimethyl-l, 3-bis(diphenyl-phosphinomethyl)cyclopentane. cData from unpublished research of the New Hampshire Group. [Pg.115]

Similar investigations were conducted on XXII. Its partial hydrolysis produced two products, l,l-C-diphenyl-2,3-isopropylidene-D-fructo-furanose (XXV), and l,l-C-diphenyl-2,3-isopropylidene-D-fructopyra-nose (XXVI). Both XXV and XXVI were non-reducing, establishing the involvement of the reducing carbon atom with an acetone residue. [Pg.267]


See other pages where 4,4 -Isopropylidene diphenyl is mentioned: [Pg.590]    [Pg.198]    [Pg.344]    [Pg.590]    [Pg.198]    [Pg.177]    [Pg.1121]    [Pg.344]    [Pg.733]    [Pg.350]    [Pg.85]    [Pg.425]    [Pg.184]    [Pg.193]    [Pg.61]    [Pg.46]    [Pg.2]    [Pg.245]    [Pg.114]    [Pg.477]    [Pg.280]    [Pg.147]    [Pg.54]    [Pg.164]    [Pg.147]    [Pg.149]    [Pg.733]    [Pg.373]    [Pg.103]    [Pg.241]    [Pg.101]    [Pg.105]    [Pg.267]    [Pg.288]   
See also in sourсe #XX -- [ Pg.198 ]




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