Diene cyclohexyl

Abbreviations acac, acetylacetonate Aik, alkyl AN, acetonitrile bpy, 2,2 -bipyridine Bu, butyl cod, 1,5- or 1,4-cyclooctadiene coe, cyclooctene cot, cyclooctatetraene Cp, cyclopentadienyl Cp, pentamethylcyclopenladienyl Cy, cyclohexyl dme, 1,2-dimethoxyethane dpe, bis(diphenyl-phosphino)ethane dppen, cis-l,2-bis(di[Atenylphosphino)ethylene dppm, bis(diphenylphosphino) methane dppp, l,3-bis(diphenylphosphino)propane eda,ethylenediamine Et,ethyl Hal,halide Hpz, pyrazole HPz, variously substituted pyrazoles Hpz, 3,5-dimethylpyrazole Me, methyl Mes, mesityl nbd, notboma-2,5-diene OBor, (lS)-endo-(-)-bomoxy Ph, phenyl phen, LlO-phenanthroline Pr, f opyl py, pyridine pz, pyrazolate Pz, variously substituted pyrazolates pz, 3,5-dimethylpyrazolate solv, solvent tfb, tetrafluorobenzo(5,6]bicyclo(2.2.2]octa-2,5,7-triene (tetrafluorobenzobanelene) THE, tetrahydrofuran tht, tetrahydrothicphene Tol, tolyl. 

Chiral salen chromium and cobalt complexes have been shown by Jacobsen et al. to catalyze an enantioselective cycloaddition reaction of carbonyl compounds with dienes [22]. The cycloaddition reaction of different aldehydes 1 containing aromatic, aliphatic, and conjugated substituents with Danishefsky s diene 2a catalyzed by the chiral salen-chromium(III) complexes 14a,b proceeds in up to 98% yield and with moderate to high ee (Scheme 4.14). It was found that the presence of oven-dried powdered 4 A molecular sieves led to increased yield and enantioselectivity. The lowest ee (62% ee, catalyst 14b) was obtained for hexanal and the highest (93% ee, catalyst 14a) was obtained for cyclohexyl aldehyde. The mechanism of the cycloaddition reaction was investigated in terms of a traditional cycloaddition, or formation of the cycloaddition product via a Mukaiyama aldol-reaction path. In the presence of the chiral salen-chromium(III) catalyst system NMR spectroscopy of the crude reaction mixture of the reaction of benzaldehyde with Danishefsky s diene revealed the exclusive presence of the cycloaddition-pathway product. The Mukaiyama aldol condensation product was prepared independently and subjected to the conditions of the chiral salen-chromium(III)-catalyzed reactions. No detectable cycloaddition product could be observed. These results point towards a [2-i-4]-cydoaddition mechanism. 

The full reduction of 1,3-dienes with Et3SiH/TFA occurs in certain systems although the yields are only modest.231 For example, 1,3-cyclohexadiene gives a 65% yield of cyclohexyl trifluoroacetate, presumably by way of cyclohexene (Eq. 88).211 On the contrary, 1,4-cyclohexadiene fails to undergo reaction with 10 equivalents of triethylsilane and 20 equivalents of trifluoroacetic acid even after 24 hours at room temperature (Eq. 89). 

The optically active catalyst 93, formed from triphenyl borate and (R)-binaphthol, catalyzes the asymmetric reaction of the dienes 94 (R1 = H or Me) with the imines 95 (R2 = Ph, 3-pyridyl or cyclohexyl). The products 96 are formed in greater than 80% ee (equation 56). Treatment of the diene 94 (R1 = H) (Danishefsky s diene) with the chiral imine 97 leads to the diastereomers 98 and 99 in the ratio 99 1 (equation 57)50. 

Cyclohexene, see Cyclohexene Cyclohexyl alcohol, see Cyclohexanol Cyclohexyl ketone, see Cyclohexanone Cyclohexylmethane, see Methylcyclohexane Cyclopenta-1,3-diene, see Cyclopentadiene 1,3-Cyclopentadiene, see Cyclopentadiene Cyclopentamethylene, see Cyclopentane Cyclopenta[(/,e]naphthalene. see Acenaphthylene Cyclopenten, see Cyclopentene Cyclopentenyl, see Cyclopentene... 

EPM/EPDMcompoundmg [ELASTOMERS, SYNTHETIC - ETHYLENE-PROPYLENE-DIENE RUBBER] (Vol 8 Cyclohexyl bromide [108-85-0]... 

Butene 4-Cyclohexyl-2-ethoxy-1.1,1-trifluoro- ElOb, 459 (F3C-COOR + -CH2-R) 2,4-Dodecadiene 12-Hydroxy-l,l,l-trifluoro- E10b2, 176f. (2-In —> 2,4-Dien)... 

Many other examples have been described that illustrate the possibility of carrying out selective reactions with PTT which would be impossible with bromine for example, 3/3-acetoxy-20-oxo-21-bromopregna-5,16-diene can be obtained from 3j8-acetoxy-20-ethylenedioxypregna-5,16-diene 6 anisyl cyclohexyl ketone gives the a-bromoketone in very good yield with the aromatic ring remaining unattacked 8 5,7-... 

Undeca- diene 1,5-Trideca- diene 1,11-Octadeca- diene Limonene 8-Cyclohexyl-1,5-octadiene... 

Cyclohexyldienyl complexes, with Ti(IV), 4, 327 Cyclohexylisocyanides, with gold(I) halides, 2, 281 Cyclohexylphosphine, for semiconductor growth, 12, 9 Cyclohexyl selenides, preparation, 9, 480 Cyclohydrocarbonylation alkenes, 11, 515 alkynes, 11, 522 dienes, 11, 522 overview, 11, 511-555 for ring expansion, 11, 527 Cycloisomerizations, via silver catalysts, 9, 558 Cyclomanganation, product types, 5, 777-778 Cyclometallated azobenzenes, liquid crystals, 12, 251 Cyclometallated complexes for OLEDs... 

Addition of cyclohexyl isocyanide to 4-amino-l-chroma-l,3-dienes ( )-96b-e provides a mild and regiospecific access to l,4-diamino-2-ethoxy naphthalenes 104 [l-NHc-QHn 4-NRR1 = NMe2, (S)-2-hydroxymethyl-pyrrolidinyl, (lf ,25)-2-methylamino-l-phenyl-l-propanol, N-f-BuMe] in... 

Octenylester E18, 477 (Dien-Red.) Ethan 2-Acetoxy-l-cyclohexyl-E19a, 535 (En + Cyclohexan) Ethin Di-tert.-butyloxy- E15/3, 3166 [-HBr(- In)]... 

Penten-l-in 5-Cyclohexyl-V/ld, 669 Propan 2,2-Dimethyl-l-phenyl-V/la, 479, 492, 496 Spiro 2,4 hepta-4,6-dien, 1,2-Diethyl-E19b, 797 (Carben + En) Tetracyclo 4.2.0.02,8.04, octan 1.5,5-Trimethyl- E19b, 438 (a-Eliminierung//Mnsertion) Tetracyclo[3.2.1.02-7.03,6 octan ... 

Propadien 3-Cyclohexyl-l-ethoxy-E15/3, 2973 (In 1,2-Dien) Spiro 3.5]nonan 9,9-Dimethyl-7-oxo-E19d. 871 (Br - Li/+ Keton Ringerweiterung) Tetrahydropyran 6-Ethenyl-2-(2-methyl-l-propenyl)- E2le, 4791 (7-OH-1,2-din + AgN03) Tricyclo(4.3.1.12 S undecan 1-... 

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