Micellar media are introduced for the efficient ring opening of epoxides with sodium salts of nucleophiles such as CNâ, N3â, NO3â, NO2â, SCNâ, Brâ and Clâ, catalyzed with Ce(OTf)4. This method is an efficient procedure for the synthesis of different β-substituted alcohols under mild reaction conditions. The reaction with SCNâ is an easy procedure for the high yielding preparation of epoxy sulfides.
Ring Opening of Epoxides with Sodium Cyanide Catalyzed with Ce(OTf)<sub>4</sub>
作者:N. Iranpoor、M. Shekarriz
DOI:10.1080/00397919908086225
日期:1999.7
Abstract Efficient and regioselectiveconversion of epoxides to β-hydroxy nitriles with sodium cyanide in the presence of catalytic amounts of Ce(OTf)4 is described undersolventfreeconditions.
A compound represented by the formula (1):
1
wherein R
1
—X— indicates that 1 to 4 R
1
—X— groups are present which may be the same or different,
the ring A is a saturated or unsaturated 5-membered heterocyclic ring,
X is a single bond, a group represented by the formula: —N(R
3
)—, —O— or —S—, or the like.
R
1
is a hydrogen atom, a halogen atom, a nitro group, a carboxyl group, a substituted or unsubstituted alkyl group, or the like,
R
2
is a hydrogen atom, a halogen atom, a nitro group, a carboxyl group, a substituted or unsubstituted alkyl group, or the like, and
R
3
is a hydrogen atom, a substituted or unsubstituted alkyl group, or the like;
a prodrug of said compound, or a pharmaceutically acceptable salt of said compound or prodrug is a useful compound as a therapeutic agent for diseases for which Rho kinase is responsible.
Binding agent compositions for inorganic fillers or oxides containing a curable binder such as a hardenable resin, and a ureido-functional organosilicon compound as described. Foundry sand compositions including binding agent compositions as described, sand and a catalyst for the hardenable resin. Shaped products comprising inorganic oxide particles. e.g., sand, a binding agent composition as described and catalyst for the hardenable resin wherein the hardenable resin is in its hardened form. Novel ureido-functional organosilicon compounds having two hydrolyzable or hydroxy groups to the molecule and at least one ureido-functional group in which the ureido group is connected to silicon by means of a group containing at least five carbon atoms.
A compound useful as a constituent of liquid crystal materials for ferroelectric liquid crystal display elements and a liquid crystal composition containing the same are provided, which compound is expressed by the formula
wherein R represents a linear or branched chain alkyl group or alkoxy group each of 1 to 20 carbon atoms, R* represents an optically active group of 3 to 16 carbon atoms and X and Y each represent H or F.
本发明提供了一种可用作铁电液晶显示元件液晶材料成分的化合物以及含有该化合物的液晶组合物,该化合物由式表示
其中 R 代表 1 至 20 个碳原子的直链或支链烷基或烷氧基,R* 代表 3 至 16 个碳原子的光学活性基团,X 和 Y 分别代表 H 或 F。