Highly Regioselective [2 + 2 + 2] Cycloaddition of Terminal Alkynes Catalyzed by η6-Arene Complexes of Titanium Supported by Dimethylsilyl-Bridgedp-tert-Butyl Calix[4]arene Ligand

2000 ◽  
Vol 122 (27) ◽  
pp. 6423-6431 ◽  
Author(s):  
Oleg V. Ozerov ◽  
Brian O. Patrick ◽  
Folami T. Ladipo
Keyword(s):  
Terminal Alkynes ◽  
Arene Complexes ◽  
Tert Butyl ◽  
Arene Ligand

Multiple-functionalizations of terminal alkynes with sodium sulfinates and tert-butyl nitrite: facile synthesis of 2H-azirines

2019 ◽  
Vol 55 (24) ◽  
pp. 3517-3520 ◽  
Author(s):  
Xingyi He ◽  
Xin Yue ◽  
Lei Zhang ◽  
Shuang Wu ◽  
Ming Hu ◽  
...  
Keyword(s):  
Terminal Alkynes ◽  
Facile Synthesis ◽  
Tert Butyl ◽  
Catalyst Free

A new, catalyst-free tandem annulation route to 2,2-disulfonyl-2H-azirines via multiple-functionalizations of terminal alkynes with sodium sulfinates and tert-butyl nitrite is described.

Synthesis, characterization, and C—N bond cleavage of tungsten(VI)arylimido-calix[4]arene complexes

2001 ◽  
Vol 79 (5-6) ◽  
pp. 463-471
Author(s):  
Martyn Brown ◽  
Chet Jablonski
Keyword(s):  
Reaction Mechanism ◽  
Good Yield ◽  
Bond Cleavage ◽  
Aliphatic Amines ◽  
Arene Complexes ◽  
Cone Conformation ◽  
Arene Derivative ◽  
Tert Butyl ◽  
Arene Complex

The tetradentate, partially flattened cone tungsten(VI) imido-calix[4]arene derivative [W(NC6H5)(t-BucalixH)]+Cl–, (4), is formed in good yield from reaction of p-tert-butyl-calix[4]arene (t-BucalixH4), and W(NC6H5)Cl4. A reaction mechanism involving a putative, bidentate calixarene intermediate W(NC6H5)(t-BucalixH2)Cl2 (3), which partitions by reversible cleavage of the imido group to give the known tetradentate calixarene complex W(t-Bucalix)Cl2 (2), and elimination of HCl to form the thermodynamic imido product 4 is proposed. A series of iso structural [W(NAr)(t-BucalixH)]+Cl– (Ar = C6H5 or o,m,p-C6H4CH3) imido derivatives (4–7), which adopt a partially flattened cone conformation in solution has been prepared by reaction of dichloride 2 with H2NAr (Ar = C6H5, o,m,p-C6H4CH3). Reaction of W(t-Bucalix)Cl2 with aliphatic amines affords a red product formulated as the nitrido complex, 9, which results from facile cleavage of the imido C—N bond.Key words: calix[4]arene complex, imido complex, nitrido complex, C—N bond cleavage, conformation, metallocalixarene.

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