Trivalent analytes such as Fe³⁺, Cr³⁺ and A^l3+ play pivotal roles in various fields including environmental monitoring, biological sensing, and industrial processes. The development of efficient and selective detection methods for trivalent species is therefore of paramount importance. In this review, we present an overview of recent advances in the recognition of trivalent analytes using simple organic chromogenic and fluorogenic probes. In this review we discuss the strategies employed for the design and synthesis of chromogenic and fluorogenic probes tailored for trivalent analytes, highlighting key structural motifs and functional groups that contribute to their recognition capabilities.

Different methods for the synthesis of pyridine derivatives as well as the chemical reactivity profiles and structures of these substances are reviewed. The utility of these compounds as precursors is emphasized in the synthesis of many heterocycles that are pharmacologically active organic compounds and agrochemicals. This review results from a literature survey containing some synthetic methods and applications of pyridine derivatives.

Continuous improvement of accounting policies coincides with the increase and development of earnings management. Several studies focus on this topic, and it became subject to many investigations. This paper deals with current literature focused on several axes of earnings management like motives for practicing earnings management, earnings management types, developed models to discover earnings management, factors affecting earnings management, and the consequences of earnings management practices. Besides, this research focuses on earnings management in Saudi Arabia in particular. In the recent period, Saudi Arabia is going through changes in the Saudi economy and changes in accounting systems, such as adopting the IFRS standards, which provides opportunities for expanding research into earnings management in the Saudi Arabia context. Several studies conclude that Saudi companies' earnings management practices are done in several ways and affected by many factors.