In Ziegler-Natta olefin polymerization, the pore architecture of catalysts plays a crucial role in catalytic performances and polymer properties. While the type of preparation routes (such as chemical reaction and solution precipitation) greatly affects the catalyst pore architecture as a result of different solidification mechanisms, the modification of the pore architecture within a given rou...

The new β-diketimine iPrDipnacnacH, HC(iPrCNDip)2H, Dip=2,6-iPr2-C6H3, was converted to the magnesium(I) complex [{(iPrDipnacnac)Mg}2] and reaction with 2-adamantanone (OAd) afforded ketone-1,2-diide [{(iPrDipnacnac)Mg}2(μ-OAd)]. contains first stable dianion of an aliphatic ketone electropositive metal shows OAd2− unit long C−O bond pyramidal carbon centre. DFT studies reveal anionic charge on...

A rearrangement of lithium alkoxide of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol into lithium alkoxide of vic-diol was mediated with an organozincate complex.

Two binuclear magnesium and zinc alkoxides supported by a bis-salalen type dinucleating heptadentate Schiff base ligand were synthesized and fully characterized. The two complexes are efficient initiators for the ring-opening polymerization (ROP) of L-lactide, affording polymers with narrow polydispersities and desirable molecular weights. Interestingly, the mechanisms for the ROP of lactide ar...

Submit Manuscript | http://medcraveonline.com PVC has significant defects due to its quick decomposition at temperature higher than 130°C [3-5]. This process results in a significant change in color, reducing the mechanical properties and the generated HCl exacerbates the decomposition of PVC, so the usage of PVC thermal stabilizers is inevitable [4,6]. Our group had synthesized pentaerythritol...

DESIGN OF FIRST-ROW TRANSITION METAL BIS(ALKOXIDE) COMPLEXES AND THEIRREACTIVITY TOWARD NITRENE AND CARBENE TRANSFERbyJAMES A. BELLOWAugust 2016Advisor: Dr. Stanislav GroysmanMajor: Chemistry (Inorganic)Degree: Doctor of PhilosophyThe novel alkoxide ligand [OCtBu2Ph], or [OR], was synthesized in a single step as a lithium salt.It was then reacted ...

Submit Manuscript | http://medcraveonline.com PVC has significant defects due to its quick decomposition at temperature higher than 130°C [3-5]. This process results in a significant change in color, reducing the mechanical properties and the generated HCl exacerbates the decomposition of PVC, so the usage of PVC thermal stabilizers is inevitable [4,6]. Our group had synthesized pentaerythritol...

Yttria-doped zirconia powders" with an extremely small crystallite size (8 nm) and a narrow size distribution have been prepared by gel precipitation methods. Precipitation of an alkoxide solution in water ("alkoxide" synthesis) results in weaker agglomerates when compared with a precipitation of a metal chloride solution in ammonia ("chloride" synthesis). Both types of agglomerate are fracture...

the transesterification process of trimethylphosphate with ethanol and isopropanol is examined. it is found that the reaction does not proceed in the absence of base even at temperature up to 100°c, whereas in the presence of sodium alkoxide as a catalyst it takes place at room temperature leading to a mixture of mono-,bi-, tri-substitute esters as well as the minor by-products resulting from t...