Alkylidene carbenes undergo rapid inter- and intramolecular reactions rearrangements, including 1,2-migrations of β-substituents to generate alkynes. Their propensity for substituent migration exerts profound influence over the broader utility alkylidene carbene intermediates, yet prior efforts categorize 1,2-migratory aptitude in these elusive species have been hampered by disparate modes gene...

The presence of 2,3,7,8-tetrachlorodibenzo-p-dioxin in 2,4,5-trichlorophenoxy acid est-ers was shown to originate from 2,4,5-tri-chlorophenol used in industrial processes. The dimerization is thought to occur when the phenol is produced from the corresponding tetrachlorobenzene by the action of alkali. Logically all products originating from chlorinated benzenes treated with alkali are possible...

The electrophoretic characteristics of the murine CL3 ascites tumour were investigated. Treatment of the cells with formaldehyde raised the electrophoretic mobility (E.P.M.) from — 1 06 to —1-28 /i/sec/V/cm; subsequent treatment with diazomethane reduced their mobility to zero. The E.P.M. of the diazomethane-treated cells did not alter over the pH range 3-0-8-0. This proved that the only ionic ...