摘要:

AbstractIn the total synthesis of steroids on the industrial scale, three factors are important: stereoselectivity of the reactions used, resolution of racemic intermediates at the earliest possible stage, and convergence of the synthesis. Theoretical advances and wider practical experience in the chemistry of polycyclic compounds have recently led to the development of the first syntheses which are suitable for the industrial production of steroid hormones.

ISSN:0570-0833    

DOI:10.1002/anie.196501811

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractProgress in the chemistry of organoheterosiloxanes is reviewed in the light of the latest preparative and spectroscopic results. Attention is focussed on the heterosiloxane structural unit SiOX, the bonding in which – depending on the hetero‐atom – differs characteristically from that in the siloxane bridg

ISSN:0570-0833    

DOI:10.1002/anie.196502011

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractUltraviolet irradiation of aqueous solutions of cyclic ketones having a tetrahedral carbon atom in at least one of the two positions adjacent to the light‐absorbing carbonyl group results in ring opening accompanied by the formation of a carboxylic acid. Cyclohexadienones which are blocked in the ortho‐position are converted to hexadienoc acids. Cycloalkanones give saturated carboxylic acids and, in the presence of oxygen, also some unsaturated ones. The scope of the reactions is illustrated, and favorable conditions are described. The structure of the products and the route by which they are presumably formed are discus

ISSN:0570-0833    

DOI:10.1002/anie.196502111

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

摘要:

AbstractApart from being of interest for physicochemical investigations, ionic liquids are a very important supplement to the non‐aqueous and water‐like solvents. The present discussion of the physical properties and current ideas on the structure of fused salts is followed by a report on the solubilities of gases, salts and metals. Our knowledge of fused salt baths and their use in electrochemical and electrometallurgical processes has recently been considerably expanded. Special attention is drawn to chemical reactions in fused electrolytes. Fused salts can also act as catalysts, so that they may often be advantageous reaction media for synthesis, if not the only media which can be u

ISSN:0570-0833    

DOI:10.1002/anie.196502221

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502381

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502393

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502402

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502413

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502422

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.196502432

出版商:Hüthig&Wepf Verlag    

年代:1965

数据来源: WILEY