Live transmission of neonatal echocardiograms over three ISDN lines is diagnostic, improves patient care and echocardiography quality, and is cost effective.
Chlorination of tetrahydrofuran and tetrahydropyran yields trans-2 : 3diclilorotetrahydrofuran and trans-2 : 3-dichlm-otetrahydropyran, identical with the compounds obained by adding chlorine to 2 : 3-dihydrofuran and 3 : 4-dihydropyran respectively. The configurations assigned to the two stereoisomers of the 2-alkyl-3-chlorotetrahydrofurans on the basis of the Auwers-Skita rules are supported by comparison of their speeds of dehydrochlorination with sodium ethoxide. Quantitative infrared analyses of the cis-Zrans mixtures of pent-3-en-1-01s and hex-3-en-1-01s formed on sodium ring fission of cis-and trans-3-chloro-2-methyl-and -ethyl-tetrahydrofurans are reported. Some reactions of 3-chlorotetrahydro-furans and -pyrans are reported.
Evidence based upon cryoscopic and spectroscopic data is presented showing that ethyl nitrate yields N02+ ions in sulfuric acid. It is suggested that this ester exhibits the same complex ioniza-tion which, as Hammett found, is shown by certain sterically hindered benzoic acids. Hydrolysis and esterification experiments confirm this belief.Aberdeen Proving Ground, Md.
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