ISSN:0165-0513    

DOI:10.1002/recl.19911100902

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe N‐alkylation of benzotriazole and 1,2,4‐triazole with alkyl halides proceeds efficiently in the presence of sodium hydroxide inN,N‐dimethylformamide

ISSN:0165-0513    

DOI:10.1002/recl.19911100903

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe ion‐exchange behaviour of CaIIand MgIIwith zeolite NaA in ethanol‐water systems has been studied. The ion‐exchange isotherms show that the affinity of the zeolite for CaIIand MgIIions decreases with increasing ethanol content,i.e.decreasing dielectric constant of the media. When adding nitrilotriacetate (NTA) as a complexing agent, the selectivity of zeolitic NaA for CaIIand MgIIions was found to decrease. The exchange phenomena observed are discussed in relation with water distribution and cation coordination preferences. Cation‐anion coordination in mixed solvents was studied using3

ISSN:0165-0513    

DOI:10.1002/recl.19911100904

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractRibonucleoside phosphoramidites have been prepared of which the exocyclic amino functions and 2′‐hydroxyl functions are protected with 2‐[(tert‐butyldiphenylsiloxy)methyl]benzoyl groups andtert‐butyldimethylsilyl groups, respectively. TheN‐SiOMB/O‐TBDMS‐blocked nucleosides proved to be suitable building units in a solid‐phase synthesis of the RNA‐fragment 5′‐AGAGUACCU‐3′ via a

ISSN:0165-0513    

DOI:10.1002/recl.19911100905

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe conformational state of poly(alkylmethyldiallylammonium bromides) was studied in aqueous solutions using pyrene as a fluorescence probe. The results are indicative for the formation of hydrophobic microdomains in the case of several copolymers which possess sufficiently hydrophobic alkyl side chains. For these materials the polymer main chain is flexible enough to form a compact‐coil conformation which allows intramolecular micellization. The effect of temperature and of the addition of NaBr and DMSO on microdomain formation was briefly investigate

ISSN:0165-0513    

DOI:10.1002/recl.19911100906

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractA convenient method is described for the synthesis of oligodeoxynucleotides15N labeled at the exocyclic amino group of cytosine. The 4‐triazolide derivative of deoxyuridine is used as a building block in the solid phase synthesis of the oligodeoxynucleotide. Deprotection and cleavage from the solid support is achieved by treatment with15N labeled NH4OH. This treatment also substitutes the 4‐triazolide group of the deoxyuridine by an15N labeled amino group to yield 4‐15N cytosine. The method was applied to a DNA fragment corresponding to a glucocorticoid response element. The oligomer was characterised by1H‐15N coherence spect

ISSN:0165-0513    

DOI:10.1002/recl.19911100907

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19911100909

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19911100911

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19911100913

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19911100914

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY