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For other examples of nonlinear plots between NNNNc/< NNNNee of auxiliary and of product see: (a)
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To account for a second chiral ligand in the coordination sphere of the active center we could have a dimeric complex possibly formed through attachment at the position X in I-M. See also the recent report of an oxygen bridged dimeric complex formed upon heating in toluene a BINOLate TiCVi-PrOH mixture, with no consequence for the topicity of the catalyzed ene reaction
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In the reaction of quiñones with styrenes furnishing [2 + 2] cycloadducts 62, Engler and his collegues also observe the formation of [5 + 2] cycloadducts (bicyclo[3.2.1]oct-3-ene-2,8-diones) which have a configuration compatible with attack of the styrene to the 3- and 5-position of the quinone from the same face from which the [2 + 2] cycloaddition occuss (see K in Chart 5), see ref 22a. and: (a)
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