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77952689058
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note
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The notation used for the alkylation products throughout the text consists of one number and two letters. The number indicates the reaction that is taking place: 7 for benzylation, 8 for methylation, 9 for ethylation, and 10 for allylation. The lower-case letter refers the nature of the alkyl group present in the starting compound, as depicted in Scheme 1. Finally, the capital letter, A or B, indicates the configuration at the benzylic center. When compounds 3 are drawn as indicated in the figure, with the C-CN bond parallel to the C-SOTol bond, isomers A and B are generated by approach of the alkylating reagents to the upper and bottom faces of the molecule, respectively. In those cases in which the priority order of the R′ group (reagent) is lower than that of the R group (substrate), according to Cahn-Ingold-Prelog rules, A isomers exhibit identical configuration at both benzylic carbon and sulfinyl group (S in the cases herein presented), whereas this is true for those B isomers when the priority order of R and R′ changes. (Chemical Equation Presented)
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16844367372
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33644657900
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47
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77952730882
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note
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2.
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48
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77952693047
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This structure has also been suggested for some lithium 2-p-tolylsulfinyl benzyl carbanions on the basis of theoretical calculations (see ref. [10])
-
This structure has also been suggested for some lithium 2-p-tolylsulfinyl benzyl carbanions on the basis of theoretical calculations (see ref. [10]).
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49
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77952736525
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Structures similar to 3a-I′ have been suggested for other benzylic carbanions stabilized by cyano groups and generated in the presence of [1.8]crown-6 ether (see ref. [11] and references therein)
-
Structures similar to 3a-I′ have been suggested for other benzylic carbanions stabilized by cyano groups and generated in the presence of [1.8]crown-6 ether (see ref. [11] and references therein).
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50
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77952722529
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Reactions were considerably slower in toluene than in THF and the formation of alkyl (Et, Pr, or Bn) 2-p-tolylsulfinylphenyl ketones (14-16) was detected
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Reactions were considerably slower in toluene than in THF and the formation of alkyl (Et, Pr, or Bn) 2-p-tolylsulfinylphenyl ketones (14-16) was detected.
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51
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77952695936
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This effect is quite analogous to the well-known influence reported for an axial methyl group on C3 and C5 positions of a cyclohexane ring
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This effect is quite analogous to the well-known influence reported for an axial methyl group on C3 and C5 positions of a cyclohexane ring.
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52
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84855635765
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2) states precludes the presence of a unique geometry
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2) states precludes the presence of a unique geometry
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53
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37049068132
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(see: G. Vanermen, S. Toppet, M. Van Beylen, P. Geerlings, J. Chem. Soc. Perkin. Trans. 2 1986, 707).
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Vanermen, G.1
Toppet, S.2
Van Beylen, M.3
Geerlings, P.4
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