A Highly Active Manganese Catalyst for Enantioselective Ketone and Ester Hydrogenation
作者:Magnus B. Widegren、Gavin J. Harkness、Alexandra M. Z. Slawin、David B. Cordes、Matthew L. Clarke
DOI:10.1002/anie.201702406
日期:2017.5.15
A newhydrogenationcatalyst based on a manganese complex of a chiral P,N,N ligand has been found to be especially active for the hydrogenation of esters down to 0.1 mol % catalyst loading, and gives up to 97 % ee in the hydrogenation of pro‐chiral deactivated ketones at 30–50 °C.
On the NH Effect in Ruthenium-Catalysed Hydrogenation of Ketones: Rational Design of Phosphine-Amino-Alcohol Ligands for Asymmetric Hydrogenation of Ketones
作者:Scott D. Phillips、José A. Fuentes、Matthew L. Clarke
DOI:10.1002/chem.201000790
日期:2010.7.19
Redesign and reduce: The graphic shows some Ru complexes of tridentate ligands that do not contain NH substituents but can catalyse ketone reduction with zero‐order dependence on ketone. In tridentate systems, a secondary amine, not a primary amine, promotes hydrogen activation. Leading on from these observations, the Ru complex of a phosphine‐amino‐alcohol shown above has been found to be a good hydrogenation
Fluorine-Containing Polymerizable Monomer And Polymer Compound Using Same
申请人:Central Glass Company, Limited
公开号:US20140148548A1
公开(公告)日:2014-05-29
The present invention provides a fluorine-containing fluorenediamine of the formula (2):
where R
1
represents one kind of substituent group selected from the group consisting of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a C
1
-C
4
alkyl group, a C
1
-C
4
fluoroalkyl group in which any number of hydrogen atoms can be substituted by a fluorine atom, a phenyl group, a methoxy group and a nitro group; R
2
represents one kind of substituent group selected from the group consisting of a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a phenyl group, a naphthyl group, a biphenyl group, a sulfonic acid group, a —C≡C—C(CH
3
)
2
OH group, a —C≡C—C
6
H
5
group and a —C≡C—Si(CH
3
)
3
group; HFIP represents a —C(CF
3
)
2
OH group; and m and n each independently represent an integer of 0 to 2 and satisfy a condition of 1≦m+n≦4.
Synthesis of 4,5-diheteroarylphenanthrenes and their dinuclear ruthenium(ii) bis(2,2′:6′,2″-terpyridine) complexes possessing severe helical twists
作者:Bo Wen、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1039/b921667g
日期:——
Three 4,5-diheteroarylphenanthrenes 2a, 2b and 2c and two dinuclear Ru(ii) bis(terpyridine) complexes 13 and 14 possessing severe helical twists were synthesized.
1,4-Di(1,2-di-tert-butyl-2-phenylethenyl)benzene and related Twist-twist pi conjugated stilbene (PPV) systems
作者:James E. Gano、Kristin Kirschbaum、Eddie D. Luzik、Padmanabhan Sekher
DOI:10.1016/s0040-4039(98)01430-0
日期:1998.9
Twist-twist, pi conjugated, TTPC, systems are described. The twisted stilbene motif represented by 2,2,5,5-tetramethyl-3,4-diphenylhex-3-ene is extended to systems with five and seven perpendicular pisystems. UV spectra show extension of the chain imparts a regular red shift to the prominent π→π∗ transition. The shift is attenuated compared to planar pi conjugated systems. Extended TTPC systems occur as