The Stereochemistry of Organometallic Compounds. XLIII. Rhodium-Catalysed Reactions of 2-(Alkenyloxy)benzylamines and 2-(N-Allyl-N-benzylamino)benzylamine

1996 ◽  
Vol 49 (2) ◽  
pp. 219 ◽  
Author(s):  
EM Campi ◽  
WR Jackson ◽  
QJ Mccubbin ◽  
AE Trnacek
Keyword(s):  
Carbon Atom ◽  
Polymeric Material ◽  
Organometallic Compounds ◽  
Rhodium Catalysts ◽  
Crossover Experiments ◽  
Allylic Cleavage

Reactions of 2-( allyloxy ) benzylamines with H2/CO in the presence of rhodium catalysts give 1,3-benzoxazines, and 2-(N- allyl-N-benzylamino ) benzylamine gives a quinazoline . These reactions have been shown to involve allylic cleavage followed by regioselective carbonylation at the internal carbon atom as demonstrated by crossover experiments. Reactions of longer chain ( alkenyloxy ) benzylamines under similar conditions give polymeric material.

The Stereochemistry of Organometallic Compounds. XLIV Rhodium-Catalysed Hydroformylation of Some Alkenylthio Aromatic Compounds

1997 ◽  
Vol 50 (8) ◽  
pp. 807 ◽  
Author(s):  
Eva M. Campi ◽  
W. Roy Jackson ◽  
Andrew E. Trnacek
Keyword(s):  
Polymeric Material ◽  
Aromatic Compounds ◽  
Organometallic Compounds

Rhodium-catalysed reactions of o-[(allyl and butenyl)thio] benzonitriles and benzamides with H2/CO give quantitative yields of aldehydes whereas the corresponding benzylamines give only polymeric material. The results are compared with reactions of the analogous alkenylamines and alkenyloxy compounds.

The stereochemistry of organometallic compounds. XV. Reactions of the allylpalladium complexes of α,β-unsaturated ketones and esters with nucleophiles

1977 ◽  
Vol 30 (3) ◽  
pp. 553 ◽  
Author(s):  
WR Jackson ◽  
JU Strauss
Keyword(s):  
Carbon Atom ◽  
Organometallic Compounds ◽  
Unsaturated Ketones ◽  
High Yields

Reactions of π-allylpalladium complexes of α,β-unsaturated ketones and esters with nucleophiles occur regioselectively at the γ-carbon atom to give high yields of γ-functionalized products. The E/Z-stereochemistry of the products is discussed in relation to the syn/anti- stereochemistry of the π-allylpalladium compounds and the reactivity of the latter compounds is discussed in terms of their 1H and 13C N.M.R. spectra.

Organic Syntheses During the Impact of a Comet with a Gaseous Planet

1997 ◽  
Vol 161 ◽  
pp. 189-195
Author(s):  
Cesare Guaita ◽  
Roberto Crippa ◽  
Federico Manzini
Keyword(s):  
Polymeric Material ◽  
Molecular Form ◽  
Parent Compound ◽  
Blue Filter ◽  
Organic Syntheses ◽  
The Impact

AbstractA large amount of CO has been detected above many SL9/Jupiter impacts. This gas was never detected before the collision. So, in our opinion, CO was released from a parent compound during the collision. We identify this compound as POM (polyoxymethylene), a formaldehyde (HCHO) polymer that, when suddenly heated, reformes monomeric HCHO. At temperatures higher than 1200°K HCHO cannot exist in molecular form and the most probable result of its decomposition is the formation of CO. At lower temperatures, HCHO can react with NH3 and/or HCN to form high UV-absorbing polymeric material. In our opinion, this kind of material has also to be taken in to account to explain the complex evolution of some SL9 impacts that we observed in CCD images taken with a blue filter.

An atomic resolution study of a carbide phase in platinum

1992 ◽  
Vol 50 (1) ◽  
pp. 20-21
Author(s):  
M.J. Witcomb ◽  
M.A. O'Keefe ◽  
CJ. Echer ◽  
C. Nelson ◽  
J.H. Turner ◽  
...  
Keyword(s):  
Solid Solution ◽  
Carbon Atom ◽  
Carbide Phase ◽  
Structural Changes ◽  
Critical Role ◽  
Alloy System ◽  
Atomic Resolution ◽  
Excess Carbon ◽  
Interstitial Carbon ◽  
Resolution Study

Under normal circumstances, Pt dissolves only a very small amount of interstitial carbon in solid solution. Even so, an appropriate quench/age treatment leads to the formation of stable Pt2C {100} plate precipitates. Excess (quenched-in) vacancies play a critical role in the process by accommodating the volume and structural changes that accompany the transformation. This alloy system exhibits other interesting properties. Due to a large vacancy/carbon atom binding energy, Pt can absorb excess carbon at high temperatures in a carburizing atmosphere. In regions rich in carbon and vacancies, another carbide phase, Pt7C which undergoes an order-disorder reaction was formed. The present study of Pt carburized at 1160°C and aged at 515°C shows that other carbides in the PtxC series can be produced.

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