The syntheses, structures, catalytic properties and antitumor activity of three titanium complexes supported by HL are reported. ![]() Finally, opportunities and strategies for on-going research and development activities in titanium catalysis are highlighted.Ī new imidazopyridine-containing pyrrolyl ligand HL (HL = 3-(1H-pyrrol-2-yl)imidazopyridine) has been synthesized and employed to the organometallic chemistry of titanium. Illustrative examples that highlight substrate scope and the application of titanium catalysis to the synthesis of complex organic small molecules, natural products and materials are shown. ![]() Insights to enhance catalyst activity as well as catalyst controlled regio- and stereoselectivities are presented. Starting from the late 90s, we provide an overview of historic inspirational contributions, both catalytic and stoichiometric, and the latest insights in catalyst design efforts, mechanistic details and utility of the three different classes of transformations. This review focuses on advances in fine chemical synthesis by titanium-catalyzed reactions featuring redox transformations and two important hydrofunctionalization reactions, hydroamination and hydroaminoalkylation. For these reactions, titanium offers new approaches and alternative pathways/mechanisms that are complementary to late transition metal-based catalysis. Nevertheless, three different fields of research in titanium catalysis have drawn attention in recent years: formal redox catalysis, hydroamination and hydroaminoalkylation. However, its potential use as a catalyst for the synthesis of fine chemicals, pharmaceuticals and agrochemicals is often overlooked due to its oxophilic, Lewis acidic character, which renders complexes of titanium less functional group tolerant than their late transition metal counterparts. Titanium is an attractive metal to use for catalytic transformations as it is a versatile and inexpensive metal of low-toxicity and of established biocompatibility. Titanium is the second most abundant transition metal and is already a key player in important industrial processes (e.g. Lee was transported via ambulance to a nearby hospital, and succumbed to his injuries later that evening.ĭetectives Wayne Easley and Jason Haak continue to work with Sergeant Paul Nall on the case, and more arrests may result from their investigation.Īnyone with any information is invited to call the Texarkana Arkansas Police Department at 90 or Texarkana Area Crime Stoppers at 903-794-STOP. Lee lying in front of a nearby apartment building. When officers arrived, they discovered 23-year-old Phillip A. 3, TAPD officers responded to a call of a man “possibly being shot in the chest” in the 2300 block of East Street. ![]() Jacquain Tyson - Courtesy: Texarkana Arkansas Police Department Keanu White - Courtesy: Texarkana Arkansas Police Department White will be brought back to Texarkana, police say, where he will be charged with one count of capital murder. According to police, task force officers were able to apprehend the 23-year-old and take him into custody on Monday evening. On Monday, the Texarkana Arkansas police worked with Little Rock police to develop information on Keanu White’s whereabouts in Little Rock. Tyson was charged with one count of capital murder. 3.Īccording to police, 22-year-old Jacquain Tyson turned himself in to police at the Bi-State Justice Center on Saturday. TEXARKANA - The Texarkana Arkansas Police Department has arrested two suspects, one in Texarkana and the other in Little Rock, in connection with the homicide on East Street on Feb.
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