regioselective synthesis of 1,5-disubstituted tetrazoles has been developed. By means of electrophilic amide activation, and further C–C bond cleavage and rearrangement, a diverse set of functionalized 1,5-DST derivatives were selectively constructed under mild conditions. As showcased in the mechanisms, the chemoselectivity is easily switched by the selection of the starting materials in the reaction.
Synthesis of 1,5-disubstituted tetrazoles via Suzuki–Miyaura cross-coupling of 5-chloro-1-phenyltetrazole
作者:Qing Tang、Ryan Gianatassio
DOI:10.1016/j.tetlet.2010.04.091
日期:2010.7
Suzuki–Miyaura coupling reactions of 5-chloro-1-phenyl-tetrazole with various functionalized arylboronic acids were investigated. In the presence of catalytic amounts of SPhos/Pd(OAc)2 or RuPhos/Pd(OAc)2, the reaction proceeded smoothly to afford 1,5-diaryltetrazoles in good to excellent yields.
Direct C−H Arylation and Alkenylation of 1-Substituted Tetrazoles: Phosphine As Stabilizing Factor
作者:Marcel Špulák、Richard Lubojacký、Petr Šenel、Jiří Kuneš、Milan Pour
DOI:10.1021/jo902180u
日期:2010.1.1
Direct arylation and alkenylation of 1-substituted tetrazoles was achieved via Pd catalysis in the presence of CuI and CS2CO3. Unlike the related reactions of imidazoles and purines, phosphine ligand was necessary to prevent the intermediate tetrazolyl-Pd-II species from fragmentation into the corresponding cyanamide, Various 1,5-disubstituted tetrazoles were prepared with good to excellent isolated yields.
Novel chemical composition to reduce defects
申请人:Buehler F. Mark
公开号:US20070228011A1
公开(公告)日:2007-10-04
A chemical composition and methods to remove defects while maintaining corrosion protection of conductors on a substrate are described. The composition includes a conductive solution, a corrosion inhibitor; and a surfactant. A surfactant-to-inhibitor ratio in the composition is a function of a metal. The surfactant is an anionic surfactant, a non-ionic surfactant, or any combination thereof. The concentration of the corrosion inhibitor in the chemical composition can be low. The corrosion inhibitor can form soft bonds with a conductor material. The conductive solution can be a high ionic strength solution. The composition is applied to a wafer having conductors on a substrate. At least two conductors on the substrate have different potentials. The composition can be used to clean the wafer after forming the conductors on the substrate. The composition can be used for chemical mechanical polishing of the wafer.
[EN] A NOVEL CHEMICAL COMPOSITION TO REDUCE DEFECTS<br/>[FR] Nouvelle composition chimique permettant de réduire les défauts
申请人:INTEL CORP
公开号:WO2007117395A1
公开(公告)日:2007-10-18
[EN] A chemical composition and methods to remove defects while maintaining corrosion protection of conductors on a substrate are described. The composition includes a conductive solution, a corrosion inhibitor; and a surfactant. A surfactant- to- inhibitor ratio in the composition is a function of a metal. The surfactant is an anionic surfactant, a non-ionic surfactant, or any combination thereof. The concentration of the corrosion inhibitor in the chemical composition can be low. The corrosion inhibitor can form soft bonds with a conductor material. The conductive solution can be a high ionic strength solution. The composition is applied to a wafer having conductors on a substrate. At least two conductors on the substrate have different potentials. The composition can be used to clean the wafer after forming the conductors on the substrate. The composition can be used for chemical mechanical polishing of the wafer. [FR] L'invention concerne une composition chimique et des procédés permettant d'éliminer les défauts tout en assurant la protection contre la corrosion de conducteurs sur un substrat. La composition comprend une solution conductrice, un inhibiteur de corrosion et un tensioactif. Le rapport tensioactif/inhibiteur dans la composition est une fonction d'un métal. Le tensioactif est un tensioactif anionique, un tensioactif non ionique ou toute combinaison de ceux-ci. La concentration de l'inhibiteur de corrosion dans la composition chimique peut être faible. L'inhibiteur de corrosion peut former des liaisons faibles avec un matériau conducteur. La solution conductrice peut être une solution de force ionique élevée. La composition est appliquée à une tranche dotée de conducteurs sur un substrat. Au moins deux conducteurs sur le substrat se situent à des potentiels différents. La composition peut être utilisée pour nettoyer la tranche après formation des conducteurs sur le substrat. La composition peut aussi être utilisée pour un polissage mécanilo-chimique de la tranche.