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Breakthrough in Chemistry: Scientists Unveil Hidden Pathway of the Ullmann Reaction Edited by Fasi Uddin 28 September 2025 The Ullmann reaction, one of the most reliable and time-tested tools in organometallic chemistry, has taken center stage again. For over a century, this copper-mediated process has been trusted for building carbon-carbon and carbon-heteroatom bonds, playing a critical role in drug discovery, material science and industrial chemistry. Now, researchers from the Chinese Academy of Sciences and UCLA have revealed groundbreaking evidence that redefines the copper redox cycle underlying Ullmann reaction. Their work, published in Nature on September 22, uncovers a Cu(I)/Cu(III)/Cu(II)/Cu(III)/Cu(I) pathway — an unexpected yet elegant cycle that could reshape our understanding of copper chemistry. The Ullmann Reaction: A Legacy in Organic Synthesis The Ullmann reaction, first discovered in the early 20th century, is one of the oldest copper-catalyzed coupling reacti...

Unveiling the Physical Chemistry of Tick Adhesion to Human Skin Introduction to the Study Researchers from Wageningen University and Research, Maastricht University, and EnzyTag BV in the Netherlands have elucidated the physical chemistry underlying ticks' adherence to host skin. Their study ,  published in Nature Chemistry , involved analyzing the  phase se paration of a synthesized amino acid resembling that found in tick saliva eva poration. Background: Tick Adhesion Mechanism The Mechanism of Tick Attachment Previous studies have demonstrated that ticks adhere to a host,  pierce the skin, and feed. However, the adhesive mechanism remained underex plored. The Role of Tick Saliva In this study, researchers collected tick saliva  protein sam ples, observing their formation into solid cones on host skin, identifying it as a bio-adhesive uniquely suited to living tissues. Key Findings from the Research Com position of Tick Saliva The research revealed that tick saliva...