The structure and bonding of 4f and 5f series organometallic compounds

1976 ◽  
pp. 23-68 ◽  
Author(s):  
Edgar C. Baker ◽  
Gordon W. Halstead ◽  
Kenneth N. Raymond
Keyword(s):  
Organometallic Compounds ◽  
Structure And Bonding

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.

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