UNUSUAL FORMATION OF 5-HALO-2,2'-BIPYRIDYLS BY TREATMENT OF TRIS(2-PYRIDYL)PHOSPHINE DERIVATIVES WITH HALOGENS

被引:16
|
作者
UCHIDA, Y [1 ]
KAJITA, R [1 ]
KAWASAKI, Y [1 ]
OAE, S [1 ]
机构
[1] INST HETEROATOM CHEM,MIHARA,OSAKA 587,JAPAN
关键词
D O I
10.1016/0040-4039(95)00719-S
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Reaction of tris(2-pyridyl)phosphine with chlorine in dichloromethane or acetonitrile gave chlorotris(2-pyridyl)phosphonium chloride which afforded a coupling product, 2,2'-bipyridyl, by treating with dilute HCl. Treatment of tris(2-pyridyl)phosphine or tris(2-pyridyl)phosphine oxide with chlorine or bromine in methanol gave unusual 5-halo-2,2'-bipyridyl as a major coupling product. This is undoubtedly an electrophilic substitution on a pyridyl ring in the pentacovalent phosphorane.
引用
收藏
页码:4077 / 4080
页数:4
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