Detail of "665-46-3"

Reference

An in vitro study for caries prevention using three organic fluoride agents

An in vitro study for caries prevention using three organic fluoride agents. Okudera, Mitsuru (2nd Dep. Prosthodontics, Kanagawa Dent. Coll., Kanagawa, Japan). Kanagawa Shigaku, 18(4), 375-93 (Japanese) 1984. CODEN: KSHGDM. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacology) The penetration of F- into human dental enamel and dentin in vitro was enhanced in the presence of diphenyldifluorosilane [312-40-3]. However, the penetration was not significantly influenced by the other 2 agents tested, tetrabutylammonium fluoride [429-41-4] and tetraethylammonium fluoride [665-46-3]. Apparently, diphenyldifluorosilane is effective in preventing dental caries.

Reaction kinetics of the model reaction of benzoic acid with ethylene carbonate

Reaction kinetics of the model reaction of benzoic acid with ethylene carbonate. Fagerburg, David R. (Res. Lab., Eastman Kodak Co., Kingsport, TN 37662, USA). J. Macromol. Sci., Chem., A21(2), 141-54 (English) 1984. CODEN: JMCHBD.There are some reagents with their cas registry numbers 665-46-3 and 96-49-1 are used in this study. ISSN: 0022-233X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 22 As a model for polymn., the reaction kinetics of BzOH [65-85-0] with ethylene carbonate (I) [96-49-1] were examd. in which various tetraethylammonium halides were used as catalysts. The salt anion appeared to have little or no effect on the rate of reaction. At a 1:1 BzOH-I mol ratio, reaction was zero-order to ~95% reaction. With Et4NOH [77-98-5] catalyst at 0.4 mol% (based on I), the activation energy was 20.8 kcal/mol with preexponential factor ln A = 17.1 (activation entropy -26 cal/deg). The activation energy for decompn. of I alone was 33 kcal/mol with preexponential factor ln A = 27.3. This ruled out previously suggested mechanisms that essentially involved decompn. of I prior to esterification. The proposed mechanism for the reaction involved the attack of the quaternary salt carboxylate on the methylene carbon of I. The attack caused ring opening and was followed by proton transfer and CO2 loss from the I half-ester intermediate. Ether linkages (such as diethylene glycol) were postulated to arise from the resultant alkoxide intermediate prior to protonation to give the hydroxyethyl ester rather than by sep. postreaction of I with the hydroxyethyl ester. .