Abstract: This invention is a novel chemical process particularly concerned with N-dealkylation of secondary amines as found in amino-cylitols of which spectinomycin is an example. Separation and further alkylation also comprise the present invention process.

Abstract: Anomers and asteric mixtures of novel analogs of spectinomycin. Additionally provides novel intermediates and process for preparing spectinomycin and analogs thereof.

Abstract: A method of detection of inaccessible metallic objects such as gas, electricity, water or telecommunications systems (lines) through which an alternating current is flowing, comprises making at least three spatially separated measurements of the magnetic field associated with the current. Signals derived from the measurements are compared in a detector which gives an output indication when the signals derived from the measurements at the two outer locations are equal and each less than the signal derived from the measurement at the intermediate location.A suitable sensing device has four equally spaced pickup coils and operates at a frequency of 43KHz. The alternating current detected in the metallic objects may be induced by a separate transmitter.

Abstract: 6-Amino-1,2-dihydro-1-hydroxy-2-iminopyrimidines, their carboxyacylated counterparts, and the corresponding acid addition salts thereof are disclosed. These compounds, useful inter alia as antihypertensive agents, are substituted in the 4-position and optionally in the 5-position, the substituent in the 4-position being oxygen bearing secondary or tertiary amino moiety.