Electrophilic 2-Thienylselenenylation of Thiophene. Preparation of Oligo(seleno-2,5-thienylenes)
摘要:
The substitution reactions of thiophene and 2-methylthiophene with the electrophilic selenenylating agent produced from the 2.2'-dithienyl diselenide by oxidation with iodobenzene diacetate involve only the alpha-positions and give rise to the formation of oligo(seleno-2,5-thienylenes). Products deriving from the attack at the alpha-positions of thiophene and 2-methylthiophene were also observed starting from the 5,5'-dimethyl-2,2'-dithienyl diselenide. The same electrophilic reagents reacted with furan and 2-methylfuran to afford a mixture of the mono- and di-substituted compounds. (C) 2000 Elsevier Science Ltd. All rights reserved.
1-(Alkylsulfonyl)- and 1-(arylsulfonyl)benzotriazoles react with sodium azide in acetonitrile to give the corresponding alkanesulfonyl and arenesulfonyl azides.
Synthesis of aminoalkylpyrazoles and-isoxazoles from cyclic β-(trifluoroacetyl) enamines
作者:V. G. Nenajdenko、S. V. Pronin、E. S. Balenkova
DOI:10.1007/s11172-007-0055-7
日期:2007.2
A method for the synthesis of cyclic β-(trifluoroacetyl) enamines was proposed. Reactions of the latter with hydrazine and hydroxylamine gave pyrazoles and isoxazoles, respectively, containing trifluoromethyl and ω-aminoalkyl fragments. Addition of hydrazine (hydroxylamine) to the above amino enones was regiospecific, the regiochemistry of the heterocyclization of trifluoromethyl ketones being different
Metallocene compounds, processes for the production of olefin polymers using catalysts containing the compounds, and olefin polymers produced by the processes
申请人:CHISSO CORPORATION
公开号:US20040127731A1
公开(公告)日:2004-07-01
Metallocene compounds represented by the following general formula (1):
Y
q
KLMX
2
(1)
wherein M, Y, q, L and X are each as defined in the Specification.
以下是用中文翻译的结果:
由下列一般式(1)表示的茂金属化合物:
Y
q
KLMX
2
(1)
其中M、Y、q、L和X的定义如规范中所述。
Inter- and intramolecular biaryl couplings via cyanocuprate intermediates
作者:Bruce H. Lipshutz、Frank Kayser、Nathalie Maullin
DOI:10.1016/s0040-4039(00)75970-3
日期:1994.1
Low temperature oxidations of selected higherordercyanocuprates composed of one or two heteroaromatic ligands can be oxidatively coupled in an inter- or intramolecular fashion to afford unsymmetrical biaryls. Non-heteroaromatic systems have also been studied in related intramolecular processes.