Cover Feature: Difluoroboron Chelation to Quinacridonequinone: A Synthetic Method for Air‐Sensitive 6,13‐Dihydroxyquinacridone via Boron Complexes (Chem. Asian J. 9/2019)

Abstract

BF2 chelation to quinacridonequinone (QQ) was performed for the development of new pigments. The resulting dark green solid was determined to be a BF2 complex of 6,13‐dihydroxyquinacridone (QA‐OH). This indicated that a two‐electron reduction occurred in the BF2 chelation, although the electron source was not specified. The BF2 complex underwent hydrolysis in argon to produce QA‐OH as a dark purple solid. Furthermore, QA‐OH was converted to QQ by air oxidation. In this paper, a new synthetic method from QQ to QA‐OH via BF2 complexes is proposed. More information can be found in the Communication by Katsuhiko Ono et al. on page 1452 in Issue 9, 2019 (DOI: 10.1002/asia.201900219).