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1
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0027658856
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Zirconocene complexes of unsaturated organic molecules: new vehicles for organic synthesis
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(1993)
Science
, vol.261
, pp. 1696
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Broene1
Buchwald2
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5
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0001452503
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Zirconocene-Mediated Synthesis of 3,4-Disubstituted Piperidines and Reduced Isoquinolines
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(1994)
Synlett
, pp. 451
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Kemp1
Whitby2
Coote3
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8
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0028012707
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Reaction of 3-zircona-1-cyclopentenes and zirconacyclopentanes with aldehydes. A selective and convenient synthesis of 4-penten-1-ols, (Z)-5-iodo-4-penten-1-ols, and related alkanols
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Aldehyde insertion
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(1994)
Tetrahedron Letters
, vol.35
, pp. 695
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Copéret1
Negishi2
Xi3
Takahashi4
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14
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0028118774
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Elaboration of zirconacyclopentanes by sequential insertion of lithium chloroallylide and ketones or aldehydes
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(1994)
Tetrahedron Letters
, vol.35
, pp. 785
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Luker1
Whitby2
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15
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20644436570
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Reaction of zirconocene dichloride with alkyllithiums or alkyl grignard reagents as a convenient method for generating a “zirconocene” equivalant and its use in zirconium-promoted cyclization of alkenes, alkynes, dienes, enynes, and diynes
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(1986)
Tetrahedron Letters
, vol.27
, pp. 2829
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Negishi1
Cederbaum2
Takahashi3
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16
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84912958821
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2O reactions) to a mixture of the metallacycle (3 or 4), and the allyl precursor (1.2 eq).
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19
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84912997698
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13C NMR, IR, MS and either HRMS or elemental analysis. All yields are for isolated compounds based on the starting dienes 1 or 2. 10b and d were formed as 2 : 1 mixtures of diastereomers between the side chain and ring stereocentres.
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20
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0002909558
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Molecular structure of ((.ETA.5-C5H5)2Zr(CH2...C(CH3)...CH-CH2)-C(CH3)=C(CH3)) prepared by regioselective insertion of 2-butyne to Zr(.ETA.5-C5H5)2(isoprene).
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The (E)-stereochemistry of 7a and 8a is certain (ref 3), that of the trisubstituted alkene analogues b – e is not, but is in accord with that assigned for lower homologues (formed by diene - alkene or diene - alkyne coupling on the metal), one of which has been proven by X-ray crystallography
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(1982)
Chemistry Letters
, pp. 1979
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Kai1
Kanehisa2
Miki3
Kasai4
Mashima5
Nagasuna6
Yasuda7
Nakamura8
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21
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84912955390
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The ketone insertion products of 7a were erroneously assigned as the (E)-alkene adducts in our previous communication (ref 3). This must be corrected to (Z) on the basis of the carbon-13 shifts of the allylic carbons, and an 11Hz cis-coupling revealed by high field NMR studies on the benzophenone adduct.
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22
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0001947357
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Regio- and stereochemistry in the sequential insertion of carbonyl compounds into zirconium-diene complexes
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Homologous zirconacycles (7-member ring) obtained by alkene - diene coupling on zirconocene give the (E)-stereochemistry on acetone insertion
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(1989)
Journal of Organometallic Chemistry
, vol.363
, pp. 61
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Yasuda1
Okamoto2
Mashima3
Nakamura4
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25
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33947093831
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A highly stereoselective synthesis of Z-trisubstituted olefins via [2,3]-sigmatropic rearrangement. Preference for a pseudoaxially substituted transition state
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C 16.0 and 21.6 p.p.m. respectively
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(1978)
Journal of the American Chemical Society
, vol.100
, pp. 1927
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Still1
Mitra2
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26
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84969324583
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Tropical Marine Algae. I. New Halogenated Monoterpenes FromChondrococcus hornemannii(Rhodophyta, Gigartinales, Rhizophyllidaceae)
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C 52.71 and 45.90 p.p.m. respectively confirming the shown geometries c.f.
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(1987)
Australian Journal of Chemistry
, vol.40
, pp. 1893
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Coll1
Wright2
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28
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0001650678
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The cerium (III) mediated reaction of trimethylsilylmethyl magnesium chloride with esters and lactones: The efficient synthesis of some functionalised allylsilanes of use in annulation reactions
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(1989)
Tetrahedron
, vol.45
, pp. 5877
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Lee1
Channon2
Cregg3
Porter4
Roden5
Yeoh6
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30
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0002566426
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The absolute configurations at 8 and 9-carbons of Adda, an amino acid component of a hepatotoxin, cyanoviridin RR
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13C NMR signals - the ratios were not determined. The ratio of the four side chain isomers were obtained by integration of the distinct benzyl proton signals. The alkene signals gave the Z : E ratio of the erythro-isomers. The overall erythro : threo ratio was proven by ozonolysis / reduction to give the erythro and threo diols 20 and 21 which were identified by NMR studies on their acetonides, Although the threo-isomer was present as a 3 : 2 mixture of double bond isomers we did not determine which was the major.
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(1989)
Tetrahedron Letters
, vol.30
, pp. 4245
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Tsukuda1
Kakisawa2
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