摘要:

AbstractThe protracted discussion of whether 2‐norbornyl cations are bridged or unbridged,i.e.nonclassical or classical, has lost most of its meaning, because these terms apply to the extremes of a graded series of structures. This is shown by a study of the solvolysis of stereoisomeric 6‐substituted 2‐norbornyl toluenesulfonates. Norbornyl and other bicyclic cations, to which nucleophiles have limited access, are stabilized by bridging between the cationic center and a saturated carbon atom in the β‐position. Bridging is reduced by electron‐attracting substituents and b

ISSN:0570-0833    

DOI:10.1002/anie.198200873

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractCarbonyl compounds undergo α‐alkylationviathe corresponding silyl enol ethers using SN1 active alkyl halides or acetates in the presence of Lewis acids. This methodology extends the scope of carbonyl chemistry considerably, since SN1 active alkylating agents are generally base sensitive and therefore unsuitable for reactions with enolate anions or nitrogen analogs. A prime example is the α‐tert‐alkylation of aldehydes, ketones and

ISSN:0570-0833    

DOI:10.1002/anie.198200961

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractIn spite of high expenditures for basic research and its indisputable significance for technological development, the knowledge so gained seldom finds its way into industrial practice without difficulty and undue delay. Even without changing the aims of basic research, more commercially exploitable research results will be obtained in the future. It is in the interests of the public and the scientists themselves that such results, not only broaden scientific knowledge, but also be transferred in the best possible way into innovative practice. An intensified patent and license policy for scientists inventions is a more appropriate solution to this effect than any independent legal protection for scientific discoveries.

ISSN:0570-0833    

DOI:10.1002/anie.198201091

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe Fischer‐Tropsch Synthesis counts among the industrial‐scale processes having a versatile and broad product range, and has for decades offered the most attractive possibility for the use of coal as a source of heating oil and fuels. This conceivably simple reaction, the catalytic hydrogenation of carbon monoxide, generally leads to simple hydrocarbons as well (i.e.short chain olefins) that have been sought as chemical feedstocks since the oil crisis of the seventies, but fails to provide the large‐scale, economic process required, due in large part to the minimal selectivity of traditional Fischer‐Tropsch processes. In an effort to solve this problem current research in this sector is concerned not only with the optimization of old and the development of new catalytic systems, but also increasingly with the elucidation of numerous relevant reaction mechanisms. This article will discuss, from the viewpoint of an organometallic chemist, the significance of typical model reactions, both with regard to some fundamental aspects of synthesis gas chemistry, and in comparison with previous views concerning the mechanism of the Fischer‐Tropsch Synthesis. The importance of various unique classes of complexes that have been studied in the context of Fischer‐Tropsch chemistry is also evaluated with regard to their importance in the synthesis of hydrocarbons from carbon monoxide and hydrogen. It emerges that the primary steps of the reductive oligomerization of carbon monoxide are best described by the carbide/methylene mechanism, as originally proposed byHans FischerandFr

ISSN:0570-0833    

DOI:10.1002/anie.198201171

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe complete manuscript of this communication appears in:Angew. Chem. Suppl. 1982, 250. DOI:10.1002/anie.198202500

ISSN:0570-0833    

DOI:10.1002/anie.198201301

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe complete manuscript of this communication appears in:Angew. Chem. Suppl. 1982, 230. DOI:10.1002/anie.198202300

ISSN:0570-0833    

DOI:10.1002/anie.198201312

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe complete manuscript of this communication appears in:Angew. Chem. Suppl. 1982, 345. DOI:10.1002/anie.198203450

ISSN:0570-0833    

DOI:10.1002/anie.198201321

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

摘要:

AbstractThe complete manuscript of this communication appears in:Angew. Chem. Suppl. 1982, 209. DOI:10.1002/anie.198202090

ISSN:0570-0833    

DOI:10.1002/anie.198201332

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.198201341

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY

ISSN:0570-0833    

DOI:10.1002/anie.198201352

出版商:Hüthig&Wepf Verlag    

年代:1982

数据来源: WILEY