In the title compound, C7H5BrN2, fused six-membered pyridine and five-membered pyrrole rings form the essentially planar aza-indole skeleton (r.m.s. deviation = 0.017 Å). In the crystal, pairs of N-H⋯N hydrogen bonds connect the mol-ecules into inversion dimers.

Feminists and other proponents of engineering diversity often encounter resistance to initiatives and programs intended to increase diversity in engineering. Supporters of diversity often suggest both strategies for attracting underrepresented group members and changes to engineering itself. It is less common for proponents of diversity to directly address the stubborn resistance to diversity t...

Problem 7.8. (a) Let ω ∈ Ω(V ). Show that there is a basis φ1, . . . , φn of V ∗ such that ω = (φ1 ∧ φ2) + · · ·+ (φ2r−1 ∧ φ2r). (b) Show that the r-fold wedge product ω∧· · ·∧ω is non-zero and decomposable, and that the (r + 1)-fold wedge product is 0. Thus r is well-determined; it is called the rank of ω. (c) If ω = ∑ i<j aijψi ∧ ψj, and A is the upper triangular matrix with Aij = aij for i <...

The title compound, C(18)H(14)N(2), was prepared by twofold Pd-catalyzed aryl-amination of a cyclic pyrido-benzo-iodo-lium salt. In the crystal, two mol-ecules of 9-benzyl-δ-carboline form centrosymmetrical dimers with distances of 3.651 (2) Å between the centroids of the pyridine rings and 3.961 (2) Å between the centroids of the pyrrole and pyridine rings. The phenyl rings point to the other ...