Pyrrolidines 3,4-divinyl

Trons-divinyl-pyrrolidines and -piperidines were prepared by sequential intermolecular and intramolecular aminations of bis-allylic carbonates (Scheme 9.21) [22aj. Due to double stereoselection, these reactions proceeded with high diastereoselectivity and enantioselectivity. 

Bicyclo 4.1.0]hept-2-enc 7-Chloro- 1449 Bicyclol2.2. l hept-2-ene 5-Chloro- 1959, 2454 Bi-cyclopropylidene 2-Chloro-2-methyl- 551 Cyclopropane l-(4-Chloro-butynyl)- 45 l-ChIoro-l,2-divinyl- 581 C HjCIFNO Pyrrolidine... 

A related strategy has been used for the conversion of 5,5-divinyl oxazoUdinones to highly substituted pyrrolidines [82]. For example, treatment of 107 with a Pd° catalyst in the presence of activated alkene 108 provides 109 in 95% yield (Eq. (1.45)). The reaction proceeds via oxidative addition followed by decarboxylation to afford the allylpalladium complex 110. Intermolecular conjugate addition to give 111, followed by intramolecular trapping of the allylpalladium moiety, affords the observed products. 

Other workers have carried out comparisons of Tg determined by DMTA and DSC. Good agreement as obtained for amorphous polyethylene terephthalate (PET) -polyethylene naphthalate bonds [9], aromatic polyimides [10], epoxy-based divinyl ester resin-styrene copolymers [11], bisphenol A-epoxy diacrylate-N-vinyl pyrrolidine networks [12], and polyesters [13]. 

The reaction of 2,3-diphenylthiiren 1,1-dioxide (8) with enamines derived from cyclic ketones gives rise to ring-enlargement products such as (9), which contain the divinyl sulphone unit e.g. the reaction of l-(l-cyclohexen-l-yl)-pyrrolidine (10) with the above thiiren gave (9 n = 1), in 86% yield. The ten-and thirteen- to fifteen-membered-ring analogues were also prepared from the... 

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