AbstractCyan‐acetessigsäure‐t‐butylester liefert bei Heizen rnit wenig Toluolsulfonsäure in Benzol die kristallisierte α‐Cyan‐acetessigsäure, die in unpolaren Lösungsmitteln relativ stabil ist. In Wasser erfolgt momentan Decarboxylierung zu Cyanaceton, das auf diese Weise leicht rein herzustellen ist.
The Formation of Pyrazolo[1,5-<i>a</i>]pyrimidine Derivatives
作者:Isaburo Hori、Koji Saito、Hiroshi Midorikawa
DOI:10.1246/bcsj.43.849
日期:1970.3
The combination reactions of 3-alkyl-2-cyano-3-methoxyacrylic esters (I) and their 3-hydrazino derivatives (II) in the presence of pyridine in alcohol at room temperature mostly gave chain intermediates, whose cyclizations led to the formation of only 2,7-dialkyl-5-hydroxypyrazolo-[1,5-a]pyrimidine derivatives. On the other hand, the reaction of Ia (3-Me) with the 5-aminopyrazole derivative (IIIa) obtained by the cyclization of IIa (3-Me) gave 7-hydroxy- and 7-aminopyrazolopyrimidine derivatives in alcohol under reflux via an intermediate. The reactions of 2-cyano-3-ethoxycrotononitrile with IIa or IIIa both afforded 7-aminopyrazolopyrimidine derivatives directly.
Four tridentate europium(III) complexes containing a diphenylphosphoryl group are prepared with strong bonding between the ligands and centered ion, convinced by crystal structures. Compared to their parent bidentatecomplexes, the tridentate complexes display improved and exceptionally high photoluminescence quantum yields (PLQYs) in powder (all over 80%, best 91%), as well as in a CH2Cl2 solution
Highly efficient room-temperature phosphorescence achieved by employing gadolinium complexes, with emission color from blue to orange.
通过使用钆配合物实现高效的室温磷光,其发射颜色从蓝色到橙色不等。
Pyrimidine derivatives and herbicides containing the same
申请人:——
公开号:US20040092402A1
公开(公告)日:2004-05-13
The present invention provides a pyrimidine derivative represented by the formula:
1
wherein R
1p
and R
1q
are the same or different, and each represents (1) hydrogen, (2) halogen, (3) a C
1-6
alkyl group which may be substituted or (4) a C
1-6
alkoxy group, and so on,
R
2
is halogen, a C
1-6
alkyl group, cyano group, and so on, Ar is a phenyl group which may be substituted or is a condensed hetero ring which may be substituted, which has excellent selective herbicidal activity, and a herbicide containing the derivative.
PYRIMIDINE DERIVATIVES AND HERBICIDES CONTAINING THE SAME
申请人:Sumitomo Chemical Takeda Agro Company, Limited
公开号:EP1333029A1
公开(公告)日:2003-08-06
The present invention provides a pyrimidine derivative represented by the formula:
wherein R1p and R1q are the same or different, and each represents (1)hydrogen, (2)halogen, (3) a C1-6alkyl group which may be substituted or (4) a C1-6alkoxy group, and so on,
R2 is halogen, a C1-6alkyl group, cyano group, and so on, Ar is a phenyl group which may be substituted or is a condensed hetero ring which may be substituted, which has excellent selective herbicidal activity, and a herbicide containing the derivative.