首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
Synthesis of Betenamine and of Betalaine Model Substances For comparisons of color, spectroscopic properties, pKa values, and stabilities, a number of model substances containing the 1,7-diazaheptamethinium chromophore 8 of the yellow and red betalaine plant pigments were prepared by the thermal or photolytic ring opening of simple pyridine derivatives (such as 2 and 14-16 ), followed by the introduction of amines. Among the novel compounds prepared were betenamine perchlorate ( 5 ), the ‘naked’ ring system of the beet-pigment betanine ( C ) as well as two 1,7-diazaheptamethinium salts 25 and 27 with terminal amono acids. The synthesis of 5 started with 4-(2-aminoethyl)pyridine ( 1 ) and proceeded via 2 , ring opening with indoline to 4 , saponification, and intramolecular amine replacement (Scheme 1). The syntheses of 25 and 27 involved only one step, namely ring opening of γ-picoline using (S)-cyclodopa ( 24 ) and (S)-proline ( 26 ), respectively (Scheme 3).  相似文献   

5.
6.
MeSbCl2 (1) and SbCl3 give the adduct MeSbCl2·0.6SbCl3 (1a). MeSbBr2 (2) reacts with NaI to form MeSbI2 (3) and with Cr(CO)5 THF to give Me(Br)2SbCr(CO)5 (4). The crystal structures of 1a, 2 and 4 are reported. Derivatives of methyl antimony are obtained by reaction of 2 or 4 with Mg in tetrahydrofuran.  相似文献   

7.
8.
A six-membered and two seven-membered cycloalkynes, namely 1 – 3, are generated by matrix photolyses of the corresponding cyclopropenones 4 – 6 at about 15 K and characterized by spectroscopic means and in two cases by identification of the trimerization products 9 and 10.  相似文献   

9.
Triphenylgallane reacts with alkyl- and aryl-thiols, respectively, with formation of the corresponding diphenylalkyl- and diphenylaryl-thiogallanes. Spectra and some physical and chemical properties of the new compounds are given. The results of the X-ray structure determination of diphenylethylthiogallane are discussed.  相似文献   

10.
11.
12.
13.
14.
15.
Associated -phosphinodiborane, (-H2PB2H5) n , is formed in the reaction of H2P(BH3)2Na with HCl in diethyl ether solution at –96°C. The formation of B–H–B bridges is demonstrated by IR and11B-NMR spectra. (-H2PB2H5) n decomposes thermally to diborane and polymeric phosphinoborane analogous to -H2NB2H5. Other phosphorus substituted -phosphinodiboranes associated via B–H–B bridges are formed in the reaction of the salts (CH3)PH(BH3)2Li, (CH3)2P(BH3)2Li, andPhPH(BH3)2Li with HCl.

Mit 6 Abbildungen

Herrn Professor Dr.E. Hayek zum 70. Geburtstag gewidmet.  相似文献   

16.
17.
18.
Zusammenfassung Die Reaktion gemischter Siliciumhalogenide mit Pyridin (=py) oder 1,10-Phenanthrolin (=phen) führte zu den Additionsverbindungen SiClBr3(py)2, SiClBr3(phen), SiCl3Br(py)2, SiCl3Br(phen), SiCl2J2(py)4, SiCl2J2(phen), SiCl3J(py)3 und SiCl3J(phen). Eine Dismutation der gemischten Siliciumhalogenide wurde dabei nicht beobachtet. Ihre Darstellung erfolgte durch Umsetzung von ClSi(Net 2)3, Cl2Si(Net 2)2 und Cl3Si(Net 2) (et=C2H5) mit HBr oder HJ. Si2Cl6 reagierte mit 3py zu SiCl4(py)2 und 1/n [SiCl2(py)] n , Si2Br6 analog zu SiBr4(py)2 und 1/n [SiBr2(py)] n , Si3Cl8 mit 4py zu SiCl4(py)2 und 2/n [SiCl2(py)] n .
The reactions of mixed silicon halogenides with pyridine (=py), or 1.10-phenanthroline (=phen) resulted in the addition compounds SiClBr3(py)2, SiClBr3(phen), SiCl3Br(py)2, SiCl3Br(phen), SiCl2I2(py)4, SiCl2I2(phen), SiCl3I(py)3 and SiCl3I(phen). Dismutation of the mixed silicon halogenides in these reactions was not observed. Their preparation was achieved by cleaving of Si–N-bonds in ClSi(Net 2)3, Cl2Si(Net 2)2 and Cl3Si(Net 2) (et=C2H5) with HBr or HI. Si2Cl6 reacted with 3py forming SiCl4(py)2 and 1/n [SiCl2(py)] n . The analogous reaction of Si2Br6 resulted in SiBr4(py)2 and 1/n [SiBr2(py)] n . Si3Cl8 and 4py formed SiCl4(py)2 and 2/n [SiCl2(py)] n .


Mit 1 Abbildung

66. Mitt.:U. Wannagat, K. Hensen, P. Petesch undF. Vielberg, Mh. Chem.98, 1415 (1967).

Zugleich 7. Mitt. über Verbindungen von Nichtmetallhalogeniden mit Pyridin und seinen Homologen; 6. Mitt.:U. Wannagat, K. Hensen undP. Petesch, Mh. Chem.98, 1423 (1967).

Mit Auszügen aus den DissertationenF. Vielberg, Techn. Hochsch. Aachen 1956, undK. Hensen, T. H. Aachen 1962.  相似文献   

19.
20.
Amidometallates of Lanthanum and Gadolinium and the Conversion of Lanthanum, Gadolinium, and Scandium with Ammonia By reaction of the metals with NsNH2 and NH3 in the hightemperature- autoclave Na3[La(NH2)6], Na3[Gd(NH2)6], and Na[Gd(NH2)4] were prepared, but not any compound of Sc. By corresponding experiments with NH4I only La(NH2)3, GdN, and ScH2 were obtained. Na3[La(NH2)6] and Na3[Gd(NH2)6] are isotypic with Na3[Y(KH2)6], Na[Gd(NH2)4] with Na[Yb((NH2)4]. The thermal behaviour of the prepared amides was characterized by DTA and tensimetry.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号