Preparation of substituted bridged indenyl and related ligands

Abstract

A process for preparing a chelating ligand of the formula (II) from a chelating ligand of the formula (I) via an sp-spor sp-spcoupling reaction with an organometallic compound of the formula (III). wherein B is a bridging group that is bonded to Land Lin formula (I) and to Land Lin formula (II); Lis a substituted monocyclic or polycyclic ligand that comprises at least one chlorine, bromine, iodine, or sulfonate substituent, directly bonded to an spcarbon atom of the ring structure of the ligand; Lis a monoanionic ligand; or Lmay, independently, be defined as L; Lis the same group as L, but said at least one chlorine, bromine, iodine, or sulfonate substituent is replaced with a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl fragment; Lis the same group as L, though, when Lis defined as L, Lmay be the same as Lor L; Ris a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl; Mis an element of group 1, 2, 12, 13 or 14 of the Periodic Table of the Elements; each X, if present, is selected independently from the group consisting of halogen atoms, the hydroxyl group, alkoxy groups, aryloxy groups, mesylate, tosylate and triflate; r is 1, 2 or 3, and t is 0, 1 or 2, where r+t corresponds to the oxidation number of M.