Isolobal Cationic Iridium Dihydride and Dizinc Complexes: A Dual Role for the ZnR Ligand Enhances H Activation.

The reaction of [Ir(IPr)H][BAr] (; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene; BAr = B{CH(3,5-CF)}) with ZnMe proceeds with CH elimination to give [Ir(IPr)(IPr')(ZnMe)H][BAr] (, where (IPr') is a cyclometalated IPr ligand). reacts with H to form tetrahydride [Ir(IPr)(ZnMe)H][BAr], , that loses H under forcing conditions to form [Ir(IPr)(ZnMe)H][BAr], . Crystallization of also results in the formation of its noncyclometalated isomer, [Ir(IPr)(ZnMe)][BAr], , in the solid state.

Extreme sensitivity in Snowball Earth formation to mountains on PaleoProterozoic supercontinents.

During the PaleoProterozoic 2.45 to 2.2 billion years ago, several glaciations may have produced Snowball Earths.

Investing in health care--a story of political clout, successful niches, and recurring cycles.

Investment in health care companies can be a good bet over the long term for a number of reasons, particularly in certain sectors within health care. Investment in other health care sectors is much riskier. This article briefly overviews investment considerations for several different sectors within health care.

Orthopedic-driven ambulatory surgery centers and specialty hospitals--a physician and hospital perspective.

This article provides an overview of several issues facing the orthopedic-driven ambulatory surgery center and specialty hospital development industry. The article specifically then reviews certain key business drivers to industry growth, examines key risks related to ASC and specialty hospital projects, and provides a brief review of certain legal issues related to the same.

An overview of federal laws and regulations governing ownership in and reimbursement for ambulatory surgical centers.

This article has addressed certain of the key federal regulatory schemes governing ASCs with which owners and operators of ASCs should be familiar. In addition to the regulatory schemes addressed herein, we encourage owners and operators of ASCs to familiarize themselves with other critical requirements such as those relating to antitrust issues, taxation issues and state requirements regarding licensure, certification, ownership arrangements, and reimbursement.