7206-17-9

Upstream product

• 693-03-8 n-butyl magnesium bromide 
• 7045-86-5 2-methyl-4,7-dihydro-1,3-dioxepine 
• 592-76-7 1-Heptene 
• 1968-40-7 ethyl 4-pentenoate 
• 1003-83-4 2,2-dimethyl-4,7-dihydro-1,3-dioxepin 
• 16666-79-8 hexylidenetriphenylphosphoran 
• 66-25-1 hexanal 
• 111-66-0 oct-1-ene 
• 6975-99-1 6-dodecyne 

Relevant academic research and scientific papers

Extension of surface organometallic chemistry to metal?organic frameworks: Development of a well-defined single site [(≡Zr? O?)W(=O)(CH2TBu)3] olefin metathesis catalyst

We report here the first step by step anchoring of a W(≡CtBu)(CH2tBu)3 complex on a highly crystalline and mesoporous MOF, namely Zr-NU-1000, using a Surface Organometallic Chemistry (SOMC) concept and methodology. SOMC allowed us to selectively graft the complex on the Zr6 clusters and characterize the obtained single site material using state of the art experimental methods including extensive solid-state NMR techniques and HAADF-STEM imaging. Further FT?IR spectroscopy revealed the presence of a W=O moiety arising from the in situ reaction of the W≡CtBu functionality with the coordinated water coming from the 8-connected hexanuclear Zr6 clusters. All the steps leading to the final grafted molecular complex have been identified by DFT. The obtained material was tested for gas phase and liquid phase olefin metathesis and exhibited higher catalytic activity than the corresponding catalysts synthesized by different grafting methods. This contribution establishes the importance of applying SOMC to MOF chemistry to get well-defined single site catalyst on MOF inorganic secondary building units, in particular the in situ synthesis of W=O alkyl complexes from their W carbyne analogues.

Ligand-Controlled Cobalt-Catalyzed Transfer Hydrogenation of Alkynes: Stereodivergent Synthesis of Z- and E-Alkenes

Herein, we report a novel cobalt-catalyzed stereodivergent transfer hydrogenation of alkynes to Z- and E-alkenes. Effective selectivity control is achieved based on a rational catalyst design. Moreover, this mild system allows for the transfer hydrogenation of alkynes bearing a wide range of functional groups in good yields using catalyst loadings as low as 0.2 mol %. The general applicability of this procedure is highlighted by the synthesis of more than 50 alkenes with good chemo- and stereoselectivity. A preliminary mechanistic study revealed that E-alkene product was generated via sequential alkyne hydrogenation to give Z-alkene intermediate, followed by a Z to E alkene isomerization process.

A comparison of the activity of homogeneous tungsten and ruthenium catalysts for the metathesis of 1-octene

The W(O-2,6-C6H3X2)2Cl 4/Bu4Sn catalytic systems (X = Ph, F, Cl, Br) have a high activity for the metathesis of terminal alkenes and a high selectivity towards primary metathesis products. Tungsten(VI) alkoxide complexes are not nearly as active as the tungsten(VI) aryloxide complexes. Bronsted acids such as HOAc, BuOH and H2O deactivate both the W(O-2,6-C6H 3X2)2Cl4/Bu4Sn (X = Cl and Ph) catalytic systems. The Lewis base (BuOAc) showed no deactivation of the catalytic systems. The Grubbs catalyst, RuCl2(PCy3) 2(=CHPh), is very active for the metathesis of 1-alkenes, even at an alkene/Ru molar ratio = 100,000. Selectivities > 93% were generally obtained. The ruthenium catalyst is active at low temperatures (25°C) and high temperatures (130°C). It shows a high tolerance towards oxygen-containing additives. The polarity of the solvent plays a major role in the activity and also the selectivity of especially the W(O-2,6-C6H3X 2)2Cl4/Bu4Sn catalytic systems.

EFFICIENT AND REGIOCONTROLLED NICKEL(II)-CATALYZED ALKYLATION OF 2-ALKYL-1,3-DIOXEP-4-ENES BY GRIGNARD REAGENTS: A SIMPLE ROUTE TO ALLYLIC ALCOHOLS

The regio- and the stereochemistries of the NidppeCl2 catalyzed alkylation of 2-alkyl-1,3-dioxep-4-enes by Grignard reagents are not affected by the nature of the C2 substituent; in any case, allylic alcohols are the main reaction products and nearly pure Z isomers are almost quantitatively obtained when either secondary or tertiary Grignard reagents are used.A rationale for the reaction is proposed.

METATHESIS OF FUNCTIONAL DERIVATIVES OF OLEFINS BY THE ACTION OF THE WCl6-1,1,3,3-TETRAMETHYL-1,3-DISILACYCLOBUTANE CATALYTIC SYSTEM

A study was carried out on the metathesis of esters of unsaturated carboxylic acids and nitriles by the action of the WCl6-1,1,3,3-tetramethyl-1,3-disilacyclobutane catalytic system.The possibility of efficient homometathesis and cometathesis with α-olefins and allyltrimethylsilane was demonstrated for ethyl 4-pentenoate and allyl cyanide.

NICKEL(II)-CATALYZED ALKYLATION OF 2-METHYL-1,3-DIOXEP-4-ENE BY GRIGNARD REAGENTS: AN EFFICIENT AND SELECTIVE ROUTE TO ALLYLIC ALCOHOLS

Allylic alcohols are formed, in good yields, through the regiocontrolled Cl2Nidppe-catalyzed alkylation of 2-methyl-1,3-dioxep-4-ene by Grignard reagents .Highly pure Z alcohols arise when secondary and tertiary aliphatic Grignards are used.

THE ADDITION OF CUPRATES TO VINYLTRIPHENYLPHOSPHONIUM BROMIDE: A SYNTHESIS OF 1,5-DISUBSTITUTED Z,Z-PENTA-1,4-DIENES

It is shown that alkyl, alkenyl and aryl cuprates add to vinyltriphenylphosphonium bromide to provide phosphoranes and that the Z:E ratio of their Wittig condensation products with benzaldehyde and hexanal are strongly influenced by the addition of hexame