Electrooxidative coupling of α-heteroatom-substituted organostannanes and organosilanes
作者:Jun-ichi Yoshida、Masanori Itoh、Sachihiko Isoe
DOI:10.1039/c39930000547
日期:——
Anodic oxidation of α-heteroatom-substituted organostannanes in the presence of organosilanes such as allylsilanes and silyl enol ethers results in the facile cleavage of the carbonâtin bond and introduction of allyl and acyl groups onto the carbon, respectively.
The introduction of tin on the carbon adjacent to the oxygen of aliphatic ethers results in significant decrease in the oxidation potentials. The effect of tin is much larger than that observed for silicon. Preparative electrochemical oxidation of alpha-alkoxystannanes results in selective cleavage of the carbon-tin bond and introduction of a nucleophile such as an alcohol onto the carbon.
Redox selective reactions of organo-silicon and -tin compounds
作者:Jun-ichi Yoshida、Keiji Nishiwaki
DOI:10.1039/a803343i
日期:——
The C-Si and C-Sn sigma orbitals are higher in energy than C-H or C-C sigma orbitals, and therefore can interact with neighboring pi systems, non-bonding orbitals of heteroatoms, and other sigma systems such as those of C-Si and C-Sn, Such interactions cause an increase of the HOMO level which in turn favors electron transfer. On the basis of this effect various types of redox selective reactions of organo-silicon and -tin compounds have been developed.
Selective formation of isonitriles by anodic oxidation of α-heteroatom-substituted organotin compounds
Anodic oxidation of α-heteroatom-substituted organotin compounds in Bu4NBF4âTHF results in the cleavage of the carbonâtin bond and exclusive formation of isonitriles whereas the reaction in Bu4NClO4âCH2Cl2 gives rise to exclusive formation of the corresponding nitriles.