Contact Catalysis, I

Projective Contact Manifolds I

A (projective) manifoldX of dimension 2n+1 together with a subbundle F ⊂ TX of rank 2n is a contact manifold if the pairing F × F → TX/F =: L defined by the Lie bracket is everywhere non-degenerate. An alternative description is as follows: there is a (sub-)line bundle L ⊂ ΩX such that the induced contact form θ ∈ H(X,ΩX⊗L) is non-degenerate in the sense that in local coordinates the form θ ∧ (...

Intriguing mechanistic labyrinths in gold(i) catalysis

Many mechanistically intriguing reactions have been developed in the last decade using gold(I) as catalyst. Here we review the main mechanistic proposals in gold-catalysed activation of alkynes and allenes, in which this metal plays a central role by stabilising a variety of complex cationic intermediates.

Hydroacenes Made Easy by Gold(I) Catalysis

A novel strategy for the synthesis of partially saturated acene derivatives has been developed based on a Au(I) -catalyzed cyclization of 1,7-enynes. This method provides straightforward access to stable polycyclic products featuring the backbone of the acene series, up to nonacene.

Oral Presentation Abstracts Session I: Catalysis

Does Contact Lead to Simi lar i ty or Simi lar i ty to Contact ? 1

Evidence from the Finnish Twin Registry (e.g., Rose et al., 1988) shows that adult monozygotic (MZ) twins are more similar, within pairs, in personality if the cotwins are presently cohabiting or in frequent contact than if they are seldom in contact. Results of a follow-up study led Kaprio et al. (1990) to conclude that "'changes in social contact between monozygotic cotwins precede (and causa...