Assignment of the vibrational modes Of Os{sub 2}(CO){sub 8}(CHCH{sub 3}) and Os(CO){sub 4}(C{sub 2}H{sub 4)} has given fingerprint vibrational spectra for the following species when chemisorbed on metal catalyst surfaces: ethylidene and ethylene bound in a metallacyclopropane mode. The formation and fragmentation of diosmacyclobutanes have been shown to involve slippage of the outgoing olefin onto a single osmium, and associative exchange of the olefin from that site. The incorporation of vinylcyclopropane without rearrangement has confirmed the absence of a diradical intermediate. The anomalous stability of the diosmacyclobutane derived from trans-2-butene has proven due to greater destabilization (by the substituent methyls) of the slipped intermediate than of the ground state. Reaction of an osmacyclobutane with 1,3- or 1,2-dienes (allenes) gives 1,2 rather than 1,4 addition to the diosmium unit. Treatment of Os(CO){sub 4}(C{sub 2}H{sub 4}) with triflic acid results in the formation of Os(CO){sub 4}(C{sub 2}H{sub 5})OTf. The authors have found that the reaction of an aryl iodine(III) reagent with propargyl stannanes or silanes results in o-iodo propargyl arenes.

This report evaluates potential impacts to public health or the environment resulting from groundwater contamination at the former uranium mill processing site. The tailings and other contaminated material at this site are being placed in an off-site disposal cell by the US Department of Energy`s (DOE) Uranium Mill Tailings Remedial Action (UMTRA) Project. Currently, the UMTRA Project is evaluating groundwater contamination. This is the second risk assessment of groundwater contamination at this site. The first risk assessment was performed primarily to evaluate existing domestic wells to determine the potential for immediate human health and environmental impacts. This risk assessment evaluates the most contaminated groundwater that flows beneath the processing site towards the Gunnison River. The monitor wells that have consistently shown the highest concentration of most contaminants are used in this risk assessment. This risk assessment will be used in conjunction with additional activities and documents to assist in determining what remedial action is needed for contaminated groundwater at the site after the tailings are relocated. This risk assessment follows an approach outlined by the US Environmental Protection Agency (EPA). The first step is to evaluate groundwater data collected from monitor wells at the site. Evaluation of these data showed …

A photograph of (left to right) George Harris, Jack Evans, Chris Thompson, Tom Teves, and Denny Maust. The men stand together with their arms around each other and smile at the camera at a Gay and Lesbian Victory Fund event in Colorado.

An indoor photograph of four men posing together with their arms around each other; two men hold beverages. The background looks through the window to a mountainous area.

A photograph of (left to right) Chris Thompson, Tom Teves, Denny Maust, William Waybourn, an unknown individual, and George Harris. The men pose with their arms around each other, smiling at the camera.

A photograph of William Waybourn and George Harris facing each other in the middle of Crossroads Market; Harris appears to be speaking to someone off-camera. A number of books on shelves are in the background, as well as partial views of pin-up posters of men.

A photograph of William Waybourn and George Harris standing together and smiling at the camera; they stand close to and on a set of stairs.

A photograph of William Waybourn, Chris Thompson, and George Harris at the Victory Fund event as they hold a conversation next to a sunny window; Harris holds a beverage.