The present invention relates to chiral compounds with two optically active phosphorus atoms, chiral transition metal catalysts which comprise these compounds as ligands, a process for preparing the P-chiral compounds and processes for asymmetric synthesis using the chiral transition metal catalysts. The present invention specifically relates to a process for preparing an optically active carbonyl compound by asymmetric hydrogenation of a prochiral ,-unsaturated carbonyl compound with hydrogen in the presence of an optically active transition metal catalyst according to the invention. Yet more specifically, the present invention relates to a process for the asymmetric hydrogenation of citral, and also a process for preparing optically active menthol.

The present invention relates to bi- and trinuclear metal complexes and to electronic devices, in particular organic electroluminescent devices, containing these complexes.

A catalyst including, as effective ingredient, complex represented by Formula (1) which contains bidentate ligand including aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms, or represented by Formula (2) which contains bidentate ligand including: aromatic heterocyclic 5-membered ring having 2 or more nitrogen atoms; and 6-membered ring having 1 or more nitrogen atoms, isomer or salt of the complex: ##STR00001##
where M.sup.1 and M.sup.2 denote transition metal such as iridium; X.sup.1 to X.sup.16 each independently denote nitrogen or carbon; R.sup.1 to R.sup.13 denote, for example, hydrogen atom, alkyl group, or hydroxy group, provided that when X.sup.i (where i denotes 13 to 16) is nitrogen, R.sup.i is absent at position corresponding to the nitrogen; L.sup.1 and L.sup.2 denote, for example, an aromatic anionic ligand; Z.sup.1 and Z.sup.2 denote any ligand or are absent; and m and n denote positive integer, 0, or negative integer.

Iridium, rhodium, and platinum complexes suitable for use as phosphorescent emitters or as delayed fluorescent and phosphorescent emitters having the following structures:

##STR00001## ##STR00002## ##STR00003##

The present invention relates to fields of organic chemistry and organometallic chemistry. The present invention discloses a chain multiyne compound, a preparation method thereof and an application in synthesizing a fused-ring metallacyclic compound. A structure of the chain multiyne compound in the present invention is shown as Formula I below. The present invention also provides a preparation method of the chain multiyne compound and an application thereof in a synthesis of a fused-ring metallacyclic compound. The chain multiyne compound disclosed in the present invention has multiple functional groups and the structure of the chain multiyne compound is adjustable. The chain multiyne compound can also be used to synthesize the fused-ring metallacyclic compound efficiently. The preparation method of the chain multiyne compound disclosed in the present invention is simple, which can be used to prepare the chain multiyne compound rapidly and efficiently. ##STR00001##

The present invention includes novel heteroleptic/homoleptic iridium complexes containing two tridentate ligands, where at least one of the tridentate ligands comprises of pyridinium-derived N-heterocyclic carbene. The compounds of the present invention may be useful for organic electroluminescent devices.

Disclosed herein are metal complexes that exhibit multiple radiative decay mechanisms, together with methods for the preparation and use thereof.

Complexes and devices, such as organic light emitting devices and full color displays, including a compound of the formula: ##STR00001## wherein: M is Pd.sup.2+, Ir.sup.+, Rh.sup.+, or Au.sup.3+; each of V.sup.1, V.sup.2, V.sup.3, and V.sup.4 is coordinated to M and is independently N, C, P, B, or Si; each of L.sup.1, L.sup.2, L.sup.3, and L.sup.4 is independently a substituted or unsubstituted aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, carbene, or N-heterocyclic carbene; and Z is O, S, NR, CR.sub.2, SiR.sub.2, BR, PR, ##STR00002## where each R is independently substituted or unsubstituted C.sub.1-C.sub.4 alkyl or substituted or unsubstituted aryl.

Provided herein are metal-ligand complexes, and associated methods, characterized by formula ML.sub.xD.sub.y; wherein: M is a metal; x is equal to the oxidation state of M; each D is independently a neutral coordinating ligand; y is zero or an integer selected from the range of 1 to 4; and each L is independently a mono-anionic ligand. L may be a .sup.1,.sup.2-,-disubstituted--alkenyl ligand.

The production of 2-propylheptanol described here is effected via Rh-catalyzed hydroformylation of C.sub.4-olefin to afford C.sub.5-aldehyde, aldol condensation to afford the C.sub.10-aldehyde and hydrogenation to afford the C.sub.10-alcohol. The emphasis is on the hydroformylation and the ligand employed therein. The problem addressed by the invention is that of reducing the costs of 2PH production. This problem is solved when a cheaper catalyst system which simultaneously achieves a better regioselectivity is employed in the hydroformylation. This catalyst system contains rhodium as the central atom and is complexed with the ligand (1): ##STR00001##