1.2- Dicyano-4- cyclohexene

Butyl vinyl ether 1,2-Dicyano-4-butoxy-cyclohexene 28 155 16... 

So far, only a few examples of cationic photopolymerizations using PET corresponding to Scheme 3 have been described [10,13,165]. In the ternary system cyclohexene oxide, 9.10-dicyano anthracene and polynuclear aromatics, the polymerization of the former is initiated by the radical cations of the aromatic hydrocarbons formed via the PET with the dicyano compound. 

The high-pressure cycloaddition of 2-vinylbenzothiophene 848 with 3-nitro-2-cyclohexen-l-one gives adduct 849, which is treated with l,5-diazabicyclo[4.3.0]non-5-ene (DBN) to afford benzothiophene 850. The reaction with indenone affords the thiophene 852 via oxidation of 851 with 2,3-dichloro-5,6-dicyano-l,4-benzoquinone (DDQ) (Scheme 130) <2001T4959>. 

E)-l,2-Dichloro- ethylene 1.2- Dicyano-4,5- trans -dichlorocyclohexene 1.2- Dicyano-4-(2 -pyridyl)-cyclohexene 8 135 16... 

The photolysis of cis- and trans- isomers of 3-methyl-5-phenyl dicyano-methylene cyclohexene gives rise to a (1, 3] benzylic shift, leading to cis- and irons- 6, 6-dicyano-3-methyl-5-phenylmethylene cyclohexanes, respectively. 

Condensation of iV-methylisatoic anhydride (259) with the lithium enolate generated from 2-cyclohexen-l-one (260) gave a P-diketo species which spontaneously cyclized into 1,2-dihydro-lO-methylacridone (261) during the workup process. The dihydroacridone 261 was then quantitatively aromatized to 10-methylacridone (30) in the presence of 2,3-dichloro-5,6-dicyano-l,4-benzoquinone in dichloromethane at room temperature 293). 

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