摘要:

AbstractReactions of 6‐tricyanovinyldihydroquinoline with concentrated hydrochloric acid and methanolic sodium hydroxide yield chlorine substitution on the heterocyclic ring and methoxide substitution of the cyano group, respectively. The chlorine substitutionviaa radical process is initiated from the tricyanovinyl group by the irradiation of visible ligh

ISSN:0009-4536    

DOI:10.1002/jccs.199800031

出版商:WILEY‐VCH Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractGem‐dihalocyclopropanes bearing a phenyl group and an additional group were nitrated by using nitric acid in a sulfuric acid matrix. The products from the nitration of aryl rings are major. The presence of a methyl group on the C(2) position of the cyclopropane ring leads to the isoxazoline from nitration at the C(1)‐position instead of that from nitration at the C(2)‐pos

ISSN:0009-4536    

DOI:10.1002/jccs.199800032

出版商:WILEY‐VCH Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractVarious amino‐functionalized polysiloxanes were synthesized in high yields (∼90%) via ring‐opening polymerization of cyclic siloxane monomers through either bulk or solution process. The amino‐functionality was introduced through adding (MeO)2MeSiC3H6NHC2H4NH2(A) or NH2C3H6(Me)2SiOSi(Me)2‐C3H6NH2(B) as terminators and/or as reagents mixed with monomers initially. The bulk polymerization of D4and P4was initiated with potassium salts such as Me3SiOK or KOH, while the solution living polymerization of D3and P3was initiated with LiOH in THF or toluene solution. The optimum conditions for preparing copolymers with different structure types were studied. The purity of the products determined by silica gel column chromatography was found to be higher than 98%. All of the copolymers were characterized with GPC,1H NMR, and DSC techniques. The silyl derivatives of primary amines were used in GPC characterization. The number‐average molecular weights determined by1H NMR and those determined by GPC measurements were in excellent agreement. The aminosilane A served either as a terminator, which gave an amino‐terminated polysiloxane, or a reagent which was mixed with comonomers initially and incorporated into the copolymerization to give a side‐chain aminopolysiloxane. When A was used as a terminator, no insertion of A into the copolymer was found. In addition, the molecular weights of the copolymers can be controlled by the amount of terminating aminosilanes added

ISSN:0009-4536    

DOI:10.1002/jccs.199800033

出版商:WILEY‐VCH Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractNew azo dyestuffs containing a sydnone ring were prepared by the diazonium coupling of 3‐(p‐/m‐aminophenyl)sydnones with phenol or 1‐/2‐

ISSN:0009-4536    

DOI:10.1002/jccs.199800034

出版商:WILEY‐VCH Verlag    

年代:1998

数据来源: WILEY

摘要:

AbstractAntiplatelet‐directed fractionation of the ethanolic extract from the root ofMucuna membranaceaHayata resulted in the isolation of friedelin (1), friedelanol (2), β‐sitosterol (3a)&stigmasterol (3b),trans‐p‐coumaric acid (4), protocatechuic acid (5), vanillic acid (6), and flavonoids — geraldol (7), 3′‐methoxydaidzein (8), genistein (9), daidzein (10), cyclosin (11), formononetin (12), orbol (13), isoformononetin (14), pratensein (15) and luteolin (16). Their structures were elucidated on the basis of spectral methods. Compounds7and8were tested for the antiplatelet aggregation activity and appeared to be specific against collagen‐induced platelet aggregation with a IC50values of 61.5 and 12.3

ISSN:0009-4536    

DOI:10.1002/jccs.199800035

出版商:WILEY‐VCH Verlag    

年代:1998

数据来源: WILEY