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Kinetics of the [2+ + 4]-Cycloaddition Reactions of 1,3-Dithian-2-ylium Ions with 1,3-Dienes

✍ Scribed by Herbert Mayr; Joachim Henninger

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 287 KB
Volume: 1998
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(199809)1998:9<1919::aid-ejoc1919>3.0.co;2-e

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✦ Synopsis

The kinetics of the [2 + + 4] cycloadditions of 1,3-dithian-2-cycloaddition pathway by the correlation lg k = s (E + N). Though a concerted cycloaddition pathway is not excluded ylium ions (1) with 1,3-dienes was investigated photometrically in dichloromethane. The second-order rate by this finding, it is obvious that the transition states of these reactions are not noticeably stabilized by the simultaneous constants determined for the reactions of 1 with 2,3dimethyl-1,3-butadiene (2a) and isoprene (2b) were identical formation of two new σ bonds. to those calculated for the first step of a stepwise

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