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Diosmacycloalkanes as models for the formation of hydrocarbons from surface methylenes. Final report
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.
Date:
April 25, 1994
Creator:
Norton, J. R.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B1148.0240]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
April 25, 1996
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1148.0241]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Carl Albert's Paige Sauer has been surrounded by people who have made her life in Oklahoma the best it could be."
Date:
April 25, 1996
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[News Clip: McVeigh]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 25, 1997, 5:00 p.m.
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library