BIS(PHOSPHINE)BORONIUM SALTS, PROCESS FOR PREPARATION OF BIS(PHOSPHINE)BORONIUM SALTS, AND BIS(PHOSPHINE)BORONIUM SALTS PREPARED BY THE PROCESS

摘要

The present invention aims to provide a bis(phosphine) boronium salt to be used as a building block or the like for producing a diphosphine compound effective mainly for various kinds of transition metal-catalyzed reactions and further to provide a preferable production method of the bis(phosphine) boronium salt and a bis(phosphine) boronium salt to be produced by the production method. The present invention provides a bis(phosphine) boronium salt having the structure defined by the following formula (1).