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For a review on green chemistry, see:. Anastas P.T., and Kirchhoff M.M. Acc. Chem. Res. 35 (2002) 686-694
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Anastas, P.T.1
Kirchhoff, M.M.2
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4
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Trost B.M. Science 254 (1991) 1471-1477
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Trost, B.M.1
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5
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33947716346
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For recent examples of tandem catalysis, see:
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12
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Choudary B.M., Chowdari N.S., Jyothi K., Kumar N.S., and Kantam M.L. Chem. Commun. (2002) 586-587
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Chem. Commun.
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Choudary, B.M.1
Chowdari, N.S.2
Jyothi, K.3
Kumar, N.S.4
Kantam, M.L.5
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14
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33947724485
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For recent reviews of domino reactions, see:
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25
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0034683331
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Kovacs J., Todd T.D., Reibenspies J.H., Joo F., and Darensbourg D.J. Organometallics 19 (2000) 3963-3969
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Organometallics
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Kovacs, J.1
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Joo, F.4
Darensbourg, D.J.5
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27
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33947722456
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For reviews on hydrogen transfer reactions, see:
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33
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28244454816
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We must also mention the work of Arterburn involving the formation of Pd-colloid species and leading to a homogeneous transfer hydrogenation of various substrates
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Prasad K., Jiang X., Slade J.S., Clemens J., Repič O., and Blacklock T.J. Adv. Synth. Cat. 347 (2005) 1769-1773 We must also mention the work of Arterburn involving the formation of Pd-colloid species and leading to a homogeneous transfer hydrogenation of various substrates
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Prasad, K.1
Jiang, X.2
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Clemens, J.4
Repič, O.5
Blacklock, T.J.6
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34
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0034619139
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Nevertheless, in the present study even if no evidences have been noticed excluding or not the formation of such Pd colloids, it seems that our catalytic system was totally homogeneous. Studies are now underway to determine the exact nature of the catalyst and will be reported in due course.
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Arterburn J.B., Pannala M., Gonzaleza A.M., and Chamberlin R.M. Tetrahedron Lett. 41 (2000) 7847-7849 Nevertheless, in the present study even if no evidences have been noticed excluding or not the formation of such Pd colloids, it seems that our catalytic system was totally homogeneous. Studies are now underway to determine the exact nature of the catalyst and will be reported in due course.
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(2000)
Tetrahedron Lett.
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Arterburn, J.B.1
Pannala, M.2
Gonzaleza, A.M.3
Chamberlin, R.M.4
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33947729337
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Brunel, J. M. Synlett, in press.
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33947717807
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note
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Kinetic experiments performed on the selective reduction of 4-allylanisole 1 under transfer hydrogen conditions indicate that such a reaction takes place in less than 4 h and can be performed using 1.2 equiv of formic acid. Nevertheless, this reaction time seems to be highly substrate dependent and we have chosen to perform all of the following experiments during 12 h and in the presence of 5 equiv of formic acid with respect to the substrate.
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40
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note
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Such an observation has been noticed by Spencer and Yu (Ref. 13) demonstrating that DCOOH produced a 70:30 mixture of deuteration at the benzylic versus C-2 position of methyl cinnamate using Pd/C heterogeneous catalyst under transfer hydrogen conditions.
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