4th EucheMs chemistry congress

Poster Session 2
s1310
chem. Listy 106, s257–s1425 (2012)
Poster session 2 - organic chemistry
P - 0 8 9 5
SyntheSiS of LAte-trAnSition MetAL
CAtALySt tethered on SiLiCAAnd itS
L-LACtide PoLyMerizAtion
y. S. Ko 1 , S. h. KiM 1 , J. S. Lee 1 , J. h. yiM 2
1 Kongju National University, Department of Chemical
Engineering, Cheonan, Republic of Korea
2 Kongju National University, Department of Advanced
Materials, Cheonan, Republic of Korea
Plastics are used almost everywhere in the world and more
environment-friendly plastics are requested from many
application areas. Polylactide(PLA) is a biodegradable aliphatic
polyester synthesized from renewable resources, such as corn or
potato starch. PLA can be prepared by condensation of lactic acid
and by the ring-opening polymerization(ROP) of the lactide. ROP
is known to produce PLA with high-molecular weights. Many
catalysts have been investigated for the polymerization of lactide
including complexes of aluminum, zinc, tin. In this study, we
constructed late-transition metal catalysts on the surface of
nanoporous silica, and examined their performance in L-lactide
polymerization. The resulting PLLA were characterized by
FT-IR, DSC and GPC.
Keywords: L-lactide; Polymerization; Late-transition metal;
Nanoporous material;
4 th EucheMs chemistry congress
P - 0 8 9 6
viSiBLe LiGht Photoredox CAtALySiS AS A
verSAtiLe tooL for CroSS dehydroGenAtive
CouPLinG reACtionS
r. KoeniGS 1 , M. ruePinG 2
1 Grunenthal GmbH, GI-P-D-MC1, Aachen, Germany
2 RWTH Aachen, Institute of Organic Chemistry, Aachen,
Germany
In recent years, the application of visible light as a
ubiquitous and renewable source of energy has attracted the
interest of synthetic organic chemists. While photochemical
reactions often need to be performed with high-energy UV light,
the use of sunlight renders photochemical transformations highly
attractive. [1]
Inorganic metal poly-bipyridyl complexes possess
well-known properties and emerged as a highly potent class of
catalysts for photochemical transformations. In particular, the
photoexcited states of ruthenium and iridium based polybipyridyl
complexes were shown to be highly efficient for catalytic
oxidations of tertiary amines. [2]
Herein, we wish to present our latest findings on the
photochemical oxidation of amines that can be efficiently coupled
with further consecutive transformations for the efficient
construction of C-C, C-P and C-N bonds. Further applications
concentrated on the development of efficient dual catalytic
transformations, relying on photochemical oxidations and
catalytic C-C bond forming reactions for the convenient
construction of functionalized amines. [3]
references:
1. A. Albini and M. Fagnoni, eds., Handbook of Synthetic
Photochemistry, Wiley-VCH, Weinheim, 2010.
2. a) K. Zeitler, Angew. Chem. Int. Ed., 2009, 48, 9785-9789;
b) J. M. R. Narayanam, C. R. J. Stephenson, Chem. Soc.
Rev., 2010, 39, 2011, 40, 102-113.
3. a) M. Rueping, C. Vila, R. M. Koenigs, K. Poscharny and
D. C. Fabry, Chem. Commun. 2011, 47, 2360-2362;
b) M. Rueping, R. M. Koenigs, K. Poscharny, D. C. Fabry
D. Leonori, C. Vila, Chem. Eur. J., 2012, 18, 5170-5174;
c) M. Rueping, S. Zhu, R. M. Koenigs, Chem. Commun.
2011, 47, 8679-8681;
d) M. Rueping, S. Zhu, R. M. Koenigs, Chem. Commun.
2011, 47, 12709-12711.
Keywords: Photocatalysis; Organocatalysis; Cross
Dehydrogenative Coupling; Visible Light;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc