Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro Deoxygenative Hydroboration with Chromium Catalysis: Scope, Mechanism, and Applications
作者:Lixing Zhao、Chenyang Hu、Xuefeng Cong、Gongda Deng、Liu Leo Liu、Meiming Luo、Xiaoming Zeng
DOI:10.1021/jacs.0c12318
日期:2021.1.27
Transition metal catalysis that utilizes N-heterocycliccarbenes as noninnocent ligands in promoting transformations has not been well studied. We report here a cyclic (alkyl)(amino)carbene (CAAC) ligand-promoted nitro deoxygenative hydroboration with cost-effective chromium catalysis. Using 1 mol % of CAAC-Cr precatalyst, the addition of HBpin to nitro scaffolds leads to deoxygenation, allowing for
Bis-[4-(R-amino)-1-pyridinium]alkanes are prepared by reacting a 4-(R-amino)pyridine with an appropriate disubstituted alkane. The compounds are useful as antimicrobial agents. Certain species are also useful as dental plaque-preventive agents.
Wasserunlösliche Schwefelfarbstoffe, ihre Herstellung und Verwendung
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0593923A1
公开(公告)日:1994-04-27
Die wasserunlöslichen Farbstoffe der Formel I
worin z.B.
F den Farbstoffchromophor von C.I.Leuco Sulphur Black 1,
R Wasserstoff, Alkyl,
M⊕ ein quartäres Ammonium- oder Phosphonium-kation, in dem die Summe der Kohlenstoffatome in den vorhandenen hydrophoben Resten mindestens 6 beträgt, bedeuten,
und n eine so große Zahl bedeutet, daß der Farbstoff I 5 bis 20 Gew.% -COO⊖-Gruppen enthält,
eignen sich insbesondere zur Herstellung von Aufzeichnungsflüssigkeiten.
式 I 的水不溶性着色剂
其中,例如
F 是 C.I.Leuco 硫黑 1 的染料发色团、
R 是氢、烷基、
M⊕ 是季铵或鏻阳离子,其中疏水基中碳原子的总和至少为 6、
n是一个很大的数字,以至于着色剂I含有5%至20%(按重量计)的-COO⊖基团、
特别适用于生产记录液体。
Soldering flux
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0619162A2
公开(公告)日:1994-10-12
A soldering flux comprising a bis (2-oxazoline) compound, a dithiol compound, an organic carboxylic acid compound and an activator which does not require post-soldering cleaning and, yet, does not cause corrosion of the base metal or deterioration of electrical characteristics and helps to clear the statutory regulations on the use of chlorofluorohydrocarbons.
A soldering flux comprising, in addition to the above components, an organic solvent, a thermoplastic resin or/and an epoxy group-containing compound.
Percutaneously absorbable preparations (preferably nonaqueous ones, particularly matrix-type patches or ointment), containing salt-form acidic drugs and characterized by being improved in the percutaneous absorbability of the drug by the incorporation of an addition salt of a basic substance therewith and by being lowly irritant to the skin; and a percutaneous absorption accelerator for salt-form acidic drugs, containing an addition salt of a basic substance.