The chemical behavior of terminally tert-butylated polyolefins

• Dagmar Klein,
• Henning Hopf,
• Peter G. Jones,
• Ina Dix and
• Ralf Hänel

Beilstein J. Org. Chem. 2015, 11, 1246–1258, doi:10.3762/bjoc.11.139

• distance between two double bonds that successfully undergo a [2 + 2] cycloaddition (between 3.5 and 4 Å, the so-called “topochemical reaction control”). Furthermore, in derivatives 2 two adjacent polyolefin chains are orthogonal to each other, because of the steric bulk of the tert-butyl moieties. The p

The preparation of new functionalized [2.2]paracyclophane derivatives with N-containing functional groups

• Henning Hopf,
• Swaminathan Vijay Narayanan and
• Peter G. Jones

Beilstein J. Org. Chem. 2015, 11, 437–445, doi:10.3762/bjoc.11.50

• paracyclophanes with preparative potential, we think that those bearing nitrogen-containing functional groups, although known for many years [19], deserve more attention. A case in point is the (achiral) pseudo-geminal diamine 7 (Figure 2) [20], which has been used as a reusable spacer for “topochemical reaction

• control in solution” [21]. We are interested in generalizing the methods described for the preparation of 7 and in the present contribution to concentrate on the preparation of the pseudo-ortho-diamine 8, which is not only chiral but also offers numerous possibilities for further transformations. Related

Intraannular photoreactions in pseudo-geminally substituted [2.2]paracyclophanes

• Henning Hopf,
• Vitaly Raev and
• Peter G. Jones

Beilstein J. Org. Chem. 2011, 7, 658–667, doi:10.3762/bjoc.7.78

• : paracyclophanes; photoadditions; photoisomerizations; proximity effects; topochemical reaction control; vinylcyclopropanes; X-ray structural analysis; Introduction Photodimerizations of crystalline aromatic or olefinic compounds are among the oldest known organic photoreactions. In this type of reaction the