Collection
Decade
Month
Day
4 Matching Results
Results open in a new window/tab.
Results:
1 - 4 of
4
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.
System:
The UNT Digital Library
Geophysical Investigations for United States Atomic Energy Commission in the Colorado Plateau Area
From introduction: The objective of the investigations is to test the usefulness of these geophysical procedures in connection with exploration for uranium-bearing mineral deposits.
Date:
July 25, 1952
Creator:
Wantland, Dart
System:
The UNT Digital Library
Computer Analysis of Geochemical Data of Stream Sediment and Waters of the Montrose 1° X 2° Quadrangle, Colorado
The following preliminary report is a computer analysis of HSSR data from the Montrose 1x2 Quadrangle, Colorado.
Date:
November 25, 1991
Creator:
Proctor, Paul Dean
System:
The UNT Digital Library
Preliminary report on diamond-drill exploration in the southern part of the Uravan district, including the Long Park area, Montrose, County, Colorado
A preliminary report discussing a diamond-drill exploration in the southern part of the Uravan District.
Date:
January 25, 1956
Creator:
Boardman, R. L.
System:
The UNT Digital Library