Homolytic Base-Promoted Aromatic Alkylations by Alkyl Halides1
摘要:
Electron-transfer chain reactions leading to regioselective alkylations of benzenes bearing electron-withdrawing substituents can be observed with alkyl halides in the presence of the radical initiator (Bu3Sn)(2) and the proton acceptor 1,4-diazabicyclo[2.2.2]octane (DABCO). Yields vary from low to high depending on the benzene derivatives. The role of DABCO is to abstract a proton from the substituted cyclohexadienyl adduct radical to form a radical anion which then transfers an electron to RX and is converted to the alkylated product itself. The rate of this electron-transfer step is probably not fast enough to sustain a good radical chain reaction so that further generation of R-. from excess (Bu3Sn)(2) and RX is necessary.
Homolytic Base-Promoted Aromatic Alkylations by Alkylmercury Halides<sup>1</sup>
作者:Glen A. Russell、Ping Chen、Byeong Hyo Kim、Ragine Rajaratnam
DOI:10.1021/ja971809n
日期:1997.9.1
Electron transfer chain reactions leading to substitution in electronegatively substituted benzene derivatives can be observed with alkylmercury halides in the presence of proton acceptors such as ...
在质子受体的存在下,可以用烷基汞卤化物观察到导致电负性取代的苯衍生物取代的电子转移链反应,例如……
ANTIPARASITIC AGENTS
申请人:Comlay Stuart Nicholas
公开号:US20100010093A1
公开(公告)日:2010-01-14
The present invention relates to compounds of the formula (I)
or a tautomer or prodrug thereof, or a pharmaceutically acceptable salt of said compound, tautomer or prodrug, wherein:
R
1
, R
2
, R
3
, R
4
and R
5
are each independently selected from H, halo, CN, CF
3
and CONH
2
; compositions containing such compounds and the uses of such compounds as antiparasitic agents.
Heterocyclic compound and organic electroluminescence device including the same
申请人:Samsung Display Co., Ltd.
公开号:US10741774B2
公开(公告)日:2020-08-11
A heterocyclic compound represented by Formula 1 and an organic electroluminescence device including the same in an emission layer.
In Formula 1, Z is represented by Formula 2-1 or 2-2.
In Formula 2-2, X1 to X3 are each independently CR10 or N, and at least one of X1 to X3 is N.