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.

Reactions of aromatic radical-anions and ethyllithium with silica gel and Brönsted acids

1990 ◽  
Vol 55 (3) ◽  
pp. 686-694 ◽  
Author(s):  
Jan Kratochvíla ◽  
Zdeněk Salajka ◽  
Antonín Kazda ◽  
Zbyněk Kadlc ◽  
Mihnea Gheorghiu
Keyword(s):  
Silica Gel ◽  
Aromatic Compounds ◽  
Organometallic Compounds ◽  
Radical Anions ◽  
Liquid Media ◽  
Structure And Bonding ◽  
Activated Silica Gel ◽  
Increasing Temperature ◽  
Hydroxy Groups ◽  
Acidic Hydrogen

Electric conductivities of radical-anions prepared from several aromatic compounds (biphenyl, naphthalene, benzophenone, anthracene, phenanthrene) and sodium in tetrahydrofuran have been measured and a suitability of radical-anions for titration of silica gel and acid impurities in liquid media have been investigated. The reactivity of the radical-anions and ethyllithium with acidic hydrogen of silica gel hydroxy groups is approximately equal in spite of substantial differences in structure and bonding character of the above compounds. Highest amounts of radical-anions and ethyllithium are decomposed by thermally non-activated silica gel (1.7 to 1.8 mmol g-1 for Davison, grade 952). With the increasing temperature of dehydration of silica gel (200-900 °C), the amount of decomposed organometallic compounds decreases approximately linearly.

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.

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.

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