Related Experiment Video
Updated: May 22, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
Potassium [1-(tert-but-oxy-carbon-yl)-1H-indol-3-yl]trifluoro-borate hemihydrate
Guillaume Berionni1, Peter Mayer, Herbert Mayr
1Ludwig-Maximilians-Universität, Department of Chemistry, Butenandtstrasse 5-13, 81377 München, Germany.
Abstract:
The asymmetric unit of the title salt, K(+)·C(13)H(14)BF(3)NO(2)·0.5H(2)O, consists of two derivatized indolyltrifluoridoborate anions, two potassium cations and one water mol-ecule. Within the indolyltrifluoro-borate anions, the least-square planes consisting of the carboxyl group and the adjacent quarternary C atom of the tert-butyl groups deviate significantly from coplanarity with the indolyl planes [20.44 (11) and 21.02 (10)°]. The potassium ions are coordinated by six atoms (one K(+) ion by two O and four F atoms, and the second K(+) ion by one O and five F atoms), however, one of the potassium ions undergoes an additional weak potassium-π inter-action (K⋯centroid = 3.722 Å). The packing is stabilized by sequential O-H⋯O hydrogen bonds along [100] between water mol-ecules and also by O-H⋯F hydrogen bonds.
Related Concept Videos
Alkali Metals
Table 1: Properties of the alkali metals
Hydroboration-Oxidation of Alkenes
Intermolecular Forces
Hybridization of Atomic Orbitals I
Weak Base Solutions
Alkyl Halides
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...

![Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[18F]fluorobenzoate ([18F]SFB)](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F2755.jpg&w=3840&q=50)