1-Norbornyl cation may be in equilibrium with 2-norbornyl cation

Mechanical Relaxation and Microstructure of Poly(norbornyl-POSS) Copolymers

The mechanical relaxation behavior and microstructure of a series of novel norbornylPOSS organic-inorganic copolymers have been investigated. We have examined the influence on physical properties of both the weight fraction of POSS-norbornyl monomer and the corner group composition. POSS refers to the polyhedral oligomeric silsesquioxane inorganic/organic macromer, which is composed of an inorg...

Anticarcinogenic activities of sulforaphane and structurally related synthetic norbornyl isothiocyanates.

Sulforaphane [1-isothiocyanato-4-(methyl-sulfinyl)butane] was recently isolated from one variety of broccoli as the major and very potent inducer of phase 2 detoxication enzymes in murine hepatoma cells in culture. Since phase 2 enzyme induction is often associated with reduced susceptibility of animals and their cells to the toxic and neoplastic effects of carcinogens and other electrophiles, ...

Puri…cation 1

An efficient method for zinc mediated reduction of norbornyl α- diketones in [bmim][BF4]:H2O

Efficient reduction of monoand disubstituted norbornyl α-diketones with zinc in [bmimBF4]:[H2O] to afford the corresponding acyloins in excellent yields and diastereoselectivities is described. In case of the monosubstituted norbornyl α-diketones, very high regioselectivities ranging from 90:10 to 100:0, in favor of diastereomer possessing endohydroxyl diagonal to endo-substituent were observed.

The Nonclassical Ion Problem - Twenty Years Later

Twenty years have passed since the author first questioned the importance of nonclassical structures for carbonium ions at the 1962 Symposium on "The Transition State" at Sheffield. At that time nonclassical structures were being advanced for essentially all carbocations known to man. There appeared to be general agreement that the 2-norbornyl cation was the most favorable example of a nonclass...