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85033148843
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note
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If old tin hydride is used, ratios of 12/12a ranging from 55:45 to 100:0 are obtained.
-
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42
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85033144389
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Unpublished results. Thèse, Ecole Polytechnique, Palaiseau, France
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Unpublished results. Muller, B. Thèse, Ecole Polytechnique, Palaiseau, France, 1996.
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48
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85033141499
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note
-
A secondary effect was observed in this reaction: for example reaction of propargyl alcohol I (PG = H) led to a 55:45 ratio of proximal/ distal tin derivative and a 91:9 ratio when the hydroxyl function was protected (PG = Ph). A stabilizing complex A between palladium and the alcohol substituent could be involved to explain this observed regioselectivity.
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49
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85033139922
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note
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When (Z)-enynol IX was protected as a TBS ether, Pd(0)-catalyzed hydrostannylation gave also the pure proximal corresponding dienylstannane in 54% yield (45% starting material recovered). Surprisingly enynol (E)-VII also protected as a TBS derivative gave the proximal isomer in only 14% yield and the (E)-3-methyl-[(tert-butyldimethylsilyl)oxy]-2,4-pentadiene in 56% yield as well.
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50
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85033150778
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-
note
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3SnCl to the cuprate solution. When the reaction was run in presence of methanol, less than 1% of the distannyl deivative 22c was obtained whereas without methanol, 22c was isolated in 61% yield.
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51
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0030287845
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cis-Bis-vinylstannanes were also obtained via other methods by Oehlschlager, A. C (ref 11) and Piers, E.; Tillyer R. D. Can. J. Chem. 1996, 74, 2048. These latter authors in the same paper, as well as Lambert, M.-P.; Ratier, M.; Duboudin, J.-G., Pétraud, N. J. Organomet. Chem. 1994, 467, 181, also described the preparation of trans-bisvinylstannanes.
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(1996)
Can. J. Chem.
, vol.74
, pp. 2048
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Piers, E.1
Tillyer, R.D.2
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52
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0010773859
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also described the preparation of trans-bisvinylstannanes
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cis-Bis-vinylstannanes were also obtained via other methods by Oehlschlager, A. C (ref 11) and Piers, E.; Tillyer R. D. Can. J. Chem. 1996, 74, 2048. These latter authors in the same paper, as well as Lambert, M.-P.; Ratier, M.; Duboudin, J.-G., Pétraud, N. J. Organomet. Chem. 1994, 467, 181, also described the preparation of trans-bisvinylstannanes.
-
(1994)
J. Organomet. Chem.
, vol.467
, pp. 181
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Lambert, M.-P.1
Ratier, M.2
Duboudin, J.-G.3
Pétraud, N.4
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54
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85033136186
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note
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In both cases described below, stannylcupration led to the corresponding bis-stannanes as the major products in 44% and 28% yield. The monovinylstannane was isolated in each case in 8-10% yield.
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