Abstract: A novel process for the preparation of syn isomers of cephalosporanic acid derivatives of the formula ##STR1## comprising reacting first in a solvent and optionally in the presence of a base, a compound of the formula ##STR2## with a compound of the formulaR.sub.4 --SO.sub.2 --Hal IIIwherein R.sub.4 is selected from the group consisting of optionally substituted alkyl, aryl and aralkyl and Hal is a halogen and reacting the resulting product in a solvent and optionally in the presence of a base with a compound of the formula ##STR3## to obtain the compound of formula I' which are known to possess good antibiotic properties.

Abstract: The monohydrate of 1.alpha.,25-dihydroxy-cholecalciferol having a remarkable vitamin activity and a process for its preparation.

Abstract: The novel product, dextrorotary 7-bromo-6-chloro-3-[3-(3-hydroxy-2-piperidyl)-acetonyl]-4(3H)-quinazolinon e and its non-toxic, pharmaceutically acceptable acid addition salts having anticoccidiosis activity and its preparation and use.

Abstract: Novel 4,5-seco-estrane-3,5,17-trione derivatives of the formula ##STR1## wherein R.sub.1 is alkyl of 1 to 3 carbon atoms, R.sub.2 is selected from the group consisting of hydrogen and alkyl of 1 to 5 carbon atoms and K and K' are individually blocked ketones in the form of ketals which are intermediates for the preparation of therapeutically active steroids and their preparation and novel intermediates.