Selective activation of propargyl 1,2-orthoesters in the presence of propargyl glycosides and propargyl ethers was studied; a catalytic amount of AuBr3 activated the propargyloxy group of the 1,2-orthoester thereby giving access to disaccharides with the propargyl group at the reducing end; furthermore, propargyl ethers were unaffected under the reaction conditions.

Cross-dehydrogenative-coupling (CDC) between C-H/C-H bonds of indoles and cyclic ethers/cycloalkanes is made viable through a simple transition-metal-free pathway. With the aid of only di-tert-butyl peroxide, a number of inactive cyclic ethers and cycloalkanes can be directly coupled with indole derivatives in satisfactory yields.

The sterol ester fraction of Ehrlich ascites cell lipids was analyzed to determine: the type of sterol, the identity of the fatty acids esterified to the sterol, the presence or absence of carcinolipin, and the presence or absence of O-alkyl cholesteryl ethers. Gas-liquid Chromatographie analyses of the intact sterol esters and sterol derivatives showed the sterol to be cholesterol. The fatty a...

[reaction: see text] p-Methoxybenzyl ethers have been found to transfer from alcohols to sulfonamides in the presence of catalytic trifluoromethanesulfonic acid. This process for protecting group removal can be performed in solution with yields >94%. Through the use of sulfonamide-functionalized ("safety-catch") resins, p-methoxybenzyl ethers can be cleaved in excellent yields with minimal puri...

A variety of switch—functionalized crown ethers have been synthesized. They change their chemical and physical properties in response to the stimuli from the outside world such as light, redox, heat, etc. These novel crown ethers act as ion carriers in membrane transport systems. The rate of ion transport can be thus controlled by an on—off—type switch.

Alkyl glyceryl ethers function mostly as skin-conditioning agents in cosmetic products applied to the skin and hair. The Cosmetic Ingredient Review expert panel reviewed the available animal toxicity and clinical data, including the low dermal absorption, and concluded that the alkyl glyceryl ethers are safe in the present practices of use and concentration described in this safety assessment.

Alcohols, trimethylsilyl ethers and thiols were efficiently converted to their corresponding carbonyl and disulfides compounds using o-xylylenebis (triphenylphosphonium) dibromochromate (XTPPDBC). This reagent can selectively oxidize thiols to disulfides in the presence of alcohols and trimethylsilyl ethers in acetonitrile at room temperature.

The absorption and fluorescence spectra, the fluorescence quantum yields and lifetimes of fluorescein and three series of alkylated fluorescein, namely, esters, ethers and ester ethers of fluorescein in SDS, CTAB and TX-100 micelles, were investigated. The interactions between the dyes and micelles, and the existing structure forms of the dyes in micelles were also studied. All alkylated fluore...

Past studies on the toxicological effects of ethylene glycol alkyl ethers as well as the recent data on these chemicals in Japan are reviewed. Only a few researchers have participated in the study of ethylene glycol alkyl ethers in Japan. The effects of ethylene glycol alkyl ethers on testis and embryotoxic effects of ethylene glycol monomethyl ether (EGM) have been studied, as has the teratoge...

5- hydroxyisoquinoline undergoes a smooth reaction with alkyl propiolates in the presence of triphenylphosphine (15 mol%) to produce the corresponding (E)-alkyl 3-(isoquinolin-5-yloxy) acrylate in good yields. When the reaction was performed by 2-methyl 4-hydroxyquinoline and 3-nitro 4-hydroxypyridine, similar aryl vinyl ethers were obtained.