ISOLATION AND RELATIVE REACTIVITIES IN CHROMIUM(VI) OXIDE OXIDATION OF THE ROTAMERS OF 9-(2-FORMYL-1-NAPHTHYL)FLUORENE AND RELATED ALCOHOLS
作者:Michinori Oki、Ryo Saito
DOI:10.1246/cl.1981.649
日期:1981.5.5
and 9-[2-(α-hydroxybenzyl)-1-naphthyl]fluorene showed that the relative reactivities of the rotamers of the former were almost the same, while those of the latter differed to a great extent. The results suggest that the steric hindrance to the approach of a base to a proton in E2 elimination is the cause of poor reactivities of the ap forms of the aldehyde and the benzylic alcohol.
分离出9-(2-甲酰基-1-萘基)芴的旋转异构体(sp 和ap)。旋转(sp → ap)的ΔH\eweq 和ΔS\eweq 分别为24.0 kcal mol-1 和-7.9 eu。sp 形式的氧化平稳地提供相应的羧酸,而 ap 形式反应非常缓慢,得到内酯。9-(2-羟甲基-1-萘基)芴和9-[2-(α-羟基苄基)-1-萘基]芴的氧化表明,前者的旋转异构体的相对反应活性几乎相同,而后者差别很大。结果表明,在 E2 消除中,碱基接近质子的空间位阻是醛和苯甲醇的 ap 形式反应性差的原因。
Transition metal complex, catalyst for olefin polymerization, and process for producing olefin polymer with the same
申请人:——
公开号:US20040242410A1
公开(公告)日:2004-12-02
The present invention relates to a transition metal complex represented by the formula (I):
1
wherein M represents a Group 4 transition metal;
—Y— represents
(a): —C(R
1
)(R
20
)-A-,
(b): —C(R
1
)(R
20
)-A
1
(R
30
)—,
(c): —C(R
1
)=A
1
-, or
(d): —C(R
1
)=A
1
-A
2
-R
30
;
A represents a Group 16 element and A
1
and A
2
each represents a Group 15 element;
R
1
to R
9
, R
20
, and R
30
are the same or different and each represents an optionally substituted hydrocarbon group, etc.; and X
1
and X
2
are the same or different and each represents a hydrogen atom, a halogen atom, an optionally substituted C
1-10
alkyl group, etc., and an intermediate product thereof, and a catalyst for olefin polymerization which comprises said transition metal complex as a component.
TRANSITION METAL COMPLEX, CATALYST FOR OLEFIN POLYMERIZATION, AND PROCESS FOR PRODUCING OLEFIN POLYMER WITH THE SAME
申请人:HANAOKA Hidenori
公开号:US20100048933A1
公开(公告)日:2010-02-25
The present invention relates to a transition metal complex represented by the formula (I):
wherein M represents a Group 4 transition metal;
—Y— represents
(a): —C(R
1
)(R
20
)-A-,
(b): —C(R
1
)(R
20
)-A
1
(R
30
)—,
(c): —C(R
1
)=A
1
-, or
(d): —C(R
1
)=A
1
-A
2
-R
30
;
A represents a Group 16 element and A
1
and A
2
each represents a Group 15 element;
R
1
to R
9
, R
20
, and R
30
are the same or different and each represents an optionally substituted hydrocarbon group, etc.; and X
1
and X
2
are the same or different and each represents a hydrogen atom, a halogen atom, an optionally substituted C
1-10
alkyl group, etc., and an intermediate product thereof, and a catalyst for olefin polymerization which comprises said transition metal complex as a component.