Bicyclo 2.2. l hept

The monomer, norbomene (or bicyclo[2.2.l]hept-2-ene), is produced by the Diels-Alder addition of ethylene to cyclopentadiene. The monomer is polymerised by a ring-opening mechanism to give a linear polymer with a repeat unit containing both an in-chain five-membered ring and a double bond. Both cis-and trans- structures are obtainable according to the choice of catalyst used ... 

S-endo)-3-(Bicyclo[2.2.1]hept-5-en-2-ylcarbonyl)-2-oxazolidlnone 2-Oxazolidinone, 3-(bicyclo[2.2.l]hept-5-en-2-ylcarbonyl)-, (1S-endo)- (12) (109299-97-0)... 

Every example with a cyclohexene has proved hydrosilation to be very slow and difficult, but this difficulty was not experienced with cyclopen-tene structures by Petrov et al. (27). A number of chlorosilanes were added to bicyclo-(2,2,l)-hept-5-ene, bicyclo-(2,2, l)-hepta-2,5-diene, 2-methyl- and 2-vinylbicyclo-(2,2,l)-hept-5-ene, and dicyclopentadiene under mild conditions. Particularly surprising was the example of Eq. 

Reactions of methoxycarbonylformonitrile, furonitrile and substituted benzoni-trile oxides (4-Me, 4-OMe, 3-OMe, 4-C1, 3-C1, 2,4-di-Cl, 4-F as substituents) with dimethyl 7-(diphenylmethylene)bicyclo[2.2. l]hept-2-ene-5,6-dicarboxylate led exclusively to exo cycloadducts 82 (R = C02Me, 2-furyl, substituted phenyl), which, on irradiation with a low-pressure mercury lamp, afforded 3-azabicyclo [4.3.0]nonadiene-7,8-dicarboxylates 83 as the only products. The 1,3-dipolar cycloaddition, followed by a photorearrangement, provides a new method for obtaining tetrahydro-27/ -pyridine derivatives from cyclopentadiene (245). 

Pyramidalization is also a well-established indicator of increased reactivity of alkenes where the 7r-type HOMO makes the major contribution to the reaction.12 This increased reactivity is specific to the more open (convex) face, and contributes to the well-known exo-selectivity of attack on bicyclo[2,2,l]hept-2-enes [60]. The electron density distribution of a derivative of [60] showed a measurable displacement of the electron-density maximum of the double bond in the exo direction (Irngartinger et al.,... 

Bicyclo 2.2.l hept-2-ene (Contin ) Decafluoro- E10b2- HO (— 2Cl, -> Dien)... 

CN 3-bicyclo[ 2.2. l]hept-5-cn-2-yl-6-chloro-3,4-dihydro- 2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-... 

S-(5-cyan-bicyclo[2.2. l]hept-2-ylester)-0,0-di-methylester XII/2, 712 -S-(2-cyan-cyelohexylester)-0,0-diethylester XII/2, 717... 

Much work has been done on the photodecomposition of 2,3-diaza-bicyclo-[2.2.l]hept-2-ene 3 17.23). 

SYNS BICYCLO(2.2.1)HEPTENE-2-DICARBOXYUC ACID, 2-ETHYLHEXYLIMIDE ENDOMETHYLENE-TETRAHYDROPHTHALIC ACID, N-2-ETHYLHEXYL IMIDE ENT 8,184 N-(2-ETHYLHEXYL)BICYCLO-(2,2,l)-HEPT-5-ENE-2,3-DICARBOXIMIDE N-2-ETHYLHEXYUMIDEENDOMETHYLENETETRAHYDR OPHTHALIC ACID N-(2-ETHYLHEXYL)-5-NORBORNENE-2.3-DICARBOXIMIDE 2-(2-ETHYLHEXYL)-3a.4,7,7a-TETRAHYDRO-4,7-METHANO-1H-ISOINDOLE-1,3(2H)-DIONE MGK-264 OCTACIDE 264 N-OCTYLBICYCLO-(2.2.1)-5-HEPTENE-2,3-DICARBOXEvnDE PYRODONE SYNERGIST 264 VAN DYK 264... 

There are many examples of polycyclic molecules and bridged molecules that have one or more double bonds. There is flattening of the ring containing the C=C unit, and this can have a significant effect on the molecule. Norbomene (bicyclo[2.2. l]hept-2-ene 134) is a simple example and it has been calculated that it contains a distorted... 

Fig. 3 The anomalous ORD spectrum consisting of several overlapping Cotton bands of the unsaturated rigid ketone, bicyclo(2,2,l)hept-5-enone, which shows how complex the spectrum can be, even for a single molecule.

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